Yoshiyasu Matsumoto
Emeritus Professor, Kyoto University[Present Position]
Fellow at Toyota Physical and Chemical Research Institute[Research Field]
Physical Chemistry, Spectroscopy and Dynamics, Catalysts, Materials Science[Date of Birth]January 20, 1953

[Sex] Male[Nationality] Japan[Graduation and Degree]
3/1975 Faculty of Engineering, Department of Industrial Chemistry. Kyoto University
3/1977 Graduate School of Engineering, Department of Industrial Chemistry, MasterCourse, Kyoto University
6/1981 Graduate School of Engineering, Department of Reaction Chemistry, Doctor
Course, The University of Tokyo
6/1981 Doctor of Engineering, The University of Tokyo (Thesis title: A Study on Gas
Phase Reactions by CARS)[Professional Career]
NSF postdoctoral fellow, Department of Chemistry,
University of Pittsburgh
7/1981-8/1984
Research Assistant, Institute for Molecular Science
9/1984-1/1985
Research Scientist, RIKEN(Institute of Physical and Chemical Research)
2/1985-2/1990
Associate Professor, Institute for Molecular Science
3/1990-3/1997
Professor, The Graduate University for Advanced Studies (Sokendai) 4/1997- 3/2004
Chair, Department of Photoscience,
The Graduate University for Advanced Studies (Sokendai)
4/1999- 3/2001
Dean, School for Advanced Sciences,
The Graduate University for Advanced Studies (Sokendai)
4/2001- 3/2004
Professor, Institute for Molecular Science
4/2004-3/2007
Professor, Kyoto University, Graduate School of Science
4/2007- 3/2018
Chair of Department of Chemistry, Kyoto University
4/2010- 3/2012
Vice Dean of Graduate School of Science, Kyoto University
4/2016- 3/2018
Fellow, Toyota Institute of Physical and Chemical Research
4/2018 – present[Membership]
Chemical Society of Japan, Physical Society of Japan, Japan Society for Molecular Science,
The Surface Science Society of Japan, The Japanese Photochemistry Association[Honors and Awards]
Hanse Wissenschaftskolleg(Fellow of Hanse Institute for Advanced Studies), Germany
The CSJ(Chemical Society Japan) Award for Creative Work

8/20023/2006

Summary of research by Dr. Yoshiyasu Matsumoto
The research of Dr. Y. Matsumoto has been focused on a wide range of subjects, from themost fundamental ones, such as adsorbates on well-defined single crystal surfaces, tocomplex systems of importance in applications such as photocatalyst particles. He haspromoted these research works, always aiming to understand them at the molecularlevel. His major research topics are: (1) the structure and dynamics of van der Waals
molecular complex, (2) the electron excited state dynamics and charge transport inorganic molecules, (3) the photochemistry and photoinduced ultrafast dynamics at
metal surfaces, (4) the structure and molecular orientation in and at thesurface/interface of ice thin film crystals grown on metal, and (5) the charge dynamics inphotocatalyst particles. The following are the main results of these topics.
1. Structure and dynamics of van der Waals molecular complex
Molecular complexes formed by weak intermolecular forces such as van der Waals
forces have vibration modes with large amplitudes that are not found in ordinary stablemolecules. Thus, exploring the structure and dynamics of weakly bound complexes isuseful for promoting an understanding of intermolecular interactions. He prepared
complexes of BF 3 and rare gas atoms, acetylene dimer, NO dimer etc using a supersonicjet, and performed high resolution infrared absorption spectroscopy of these molecularcomplexes. Although acetylene dimer has a T-shaped stable structure, he demonstrated
for the first time that two acetylene molecules undergo large-amplitude motion in whichmolecules rotate like a gear. Moreover, he found that the line width of the asymmetricstretching vibration band of NO dimer greatly differs from that of the symmetricalstretching vibration of NO, showing that the vibrational predissociation rate of thecomplex strongly depends on vibrational modes.
2. Electronically excited state dynamics and charge transport in organic molecules
The dynamics of electronic states of organic molecules is an central issue that has
been studied for a long time. Much effort has be devoted to understand the dynamics of
excitons in crystals and thin films composed of organic molecules, the transport ofcharges derived from charge separation of excitons in organic molecule aggregates.
Moreover, this research area is very important in applications such as photovoltaics. He
expanded the research targets from isolated molecules in the gas phase to organic1

semiconductor molecular aggregates in the forms of crystals and thin films, andelucidated the electronic excited state dynamics and charge transfer / transport oforganic molecules.
2-1. Intramolecular electron relaxation dynamics in isolated vapor phase molecules
An excited singlet state relaxes to an excited triplet state due to spin-orbit
interaction: intersystem crossing. This process is a research subject that has been of
great scientific interest for years. However, in the conventional studies targeting
molecules in the gas phase, intermolecular collisions cannot be avoided and it is
impossible to cool down to extremely low temperature without molecular aggregation.
Thus, organic molecules are distributed among many ro-vibrational states of theelectronic ground state. This makes difficult to investigate the molecular rotation state
dependence of intramolecular electron relaxation dynamics of polyatomic molecules aslarge as benzene. He simplified the spectrum of organic molecules by lowering theinternal temperature of molecules by using supersonic jet expansion, and clarified how
the spin-orbit interaction depends molecular rotation in the excited state using an
excitation laser with a linewidth sufficiently narrow to resolve rotational structures in
excitation spectra. The molecules of interest are pyrazine, pyrimidine and the like. He
succeeded in coherently exciting molecular eigenstates in the singlet manifold that are
hybridized with triplet ro-vibrational states with spin·orbit coupling, and clarified thatthe number of triplet states involved in this hybridization depends on the rotational
quantum number of states in the singlet manifold.
2-2. Exciton dynamics in organic semiconductor thin films
The properties of excitons in organic semiconductors are important for
determining the light conversion efficiency in photovoltaics. Because molecules inorganic semiconductor crystals are bound with weak intermolecular forces, the spatial
extent, lifetime, diffusion and other properties of excitons are very much different fromthose of inorganic semiconductors with strong bonds between constituent atoms. He
focused on singlet fission: a singlet exciton excited by one photon splits into two triplet
excitons. This is an important process capable of doubling the light conversion
efficiency of organic semiconductor solar cells. Focusing on rubrene single crystal, hedemonstrated that single fission takes place from superposition states of excited singlet
and triplet states coherently excited and it is promoted by symmetry breaking withexcitation of intermolecular vibrational modes along with the electronic transition. This
indicates that coherent excitation of the superposition states in the electronically2excited states is also important in aggregates just as in the case of isolated molecules in
the gas phase. It is also the first example that clearly demonstrates experimentally thatsinglet fission is promoted through vibronic interaction associated with intermolecularvibration.
2-3. Charge transport in organic semiconductor thin film
Charge transport in organic semiconductor thin films is an important process
determining the performance of organic EL elements, organic field effect transistors,
and the like. He succeeded for the first time in mapping the two dimensional spatial
distribution of the carrier density in the organic field effect transistor made ofpentacene by a home-built sum frequency generation spectroscopy microscope.
Furthermore, he succeeded in observing the absorption spectra of holes responsible forcharge transport by charge modulation spectroscopy for an organic field effecttransistor composed of rubrene, and also succeeded in clarifying that charge transport
in dinaphtho [2,3-b: 2',3'-f] thieno [3,2-b] thiophene (DNTT) is greatly enhanced byintroducing side chain of alkyl group into this molecule.
3. Photochemistry and Photoinduced Ultrafast Dynamics of Adsorbed Species on Metal
Surface3-1. Photochemistry on metal solid surface
Two excitation mechanisms can be considered for the excitation of electronic
states of adsorbed species on the metal surface by light irradiation: light absorption(direct excitation) of the adsorbed species itself and light absorption (indirect excitation)by the metal surface. It is difficult to distinguish these with experiments, and it has
been considered that nearly all photochemistry in the visible and ultraviolet regions on
metal surfaces is induced by indirect excitation. He studied the photochemistry of
methane weakly adsorbed on a clean metal surface. It was known that methane isdissociated in the gas phase by light absorption in the vacuum ultraviolet region.
However, he discovered for the first time that methane physisorbed on platinum,
palladium, copper, etc. dissociates into methyl and hydrogen by ultraviolet lightirradiation at the wavelength where methane in the gas phase has no absorption.
Furthermore, he made a systematic measurement of the photochemical cross section
and clarified that the excitation mechanism is a transition from the highest occupied
state of methane: the direct excitation of the methane electronic state. In addition tothis, he also studied the surface reaction of highly energetic oxygen atoms generated byphotodissociation of N 2 O on Pt(111), and put forward the hot atom surface chemistry.
33-2. Photo-induced ultrafast dynamics of adsorbed species on metal surfaces
He conducted research on real-time observation of ultrafast dynamics ofsurface photochemical reaction process. When an adsorbed molecule is electronically
excited by light, vibration of adsorbed species is excited through electron-phonon
interaction, but nuclear dynamics at metal surfaces induced by the electronic excitation
was rarely explored. He applied femtosecond time-resolved surface second harmonic
generation spectroscopy to alkali metal atoms adsorbed on platinum or copper surfaces.
He observed that the stretching vibration between alkali atom and substrate is excitedin phase: coherent phonon excitation. In addition, he clarified the mechanism of
relaxation dynamics of this coherent vibration, and succeeded for the first time inexciting the surface vibration mode selectively by shaping the sequence of excitation
light pulses. He also showed that direct and indirect excitations selectively occur
depending on excitation wavelength. Thermal reactions on slid surface take place
during excitation of various vibration modes of adsorption systems under the thermal
equilibrium, in which some vibration modes are directly involved in the reaction. Thus,
the mode-selective surface vibration excitation by light-pulse irradiation opens a way
for controlling surface reaction. Furthermore, he expanded the range of research into
the photo-stimulated desorption dynamics of CO, which is a simplest chemisorbed
polyatomic molecule, and newly applied time-resolved vibrational spectroscopy, infraredand visible sum frequency generation spectroscopy, to this adsorption system. As aresult, he succeeded in finely grasping the adsorbate nuclear motions along thedissociation of the bond between the adsorbed species and the surface: desorption of CO
molecule to the gas phase. This research can be regarded as a breakthrough inelucidating the surface ultrafast process of more complex and generalized polyatomic
molecular adsorption species.
4. Molecular arrangement and structure on ice thin film crystal and its surface
Since the study of the structure of ice crystals by X-ray diffraction in the 1930's,
the ice exhibiting ferroelectricity in which water molecules orient uniformly hasgathered a lot of attentions. He elucidated how the ferroelectric ice thin film grows bycontrolling the orientation of water molecules by sum frequency generation spectroscopy.
The growth of a ferroelectric ice thin-film crystal on Pt (111) was a long standing
controversial issue. He has put an end to this controversy by showing that the crystal
thin film in which water molecules are oriented in the same direction on Pt(111). Also
noteworthy is that heterodyne detection of sum frequency generation signals allows todetermine the orientation of water molecules in the ice thin crystal: water molecules at4

the Pt(111) surface adsorb while one of hydrogen atoms points to the surface, so that
this molecular orientation is propagated into the thin film through hydrogen bonds.
Furthermore, he elucidated the details of ice structure at the vacuum side of the ice thinfilm crystals, where the outermost surface and subsurface has a structure different fromthat in the bulk thin film.
5. Charge dynamics in photocatalyst particles
He

elucidatedthedynamicsofphotoinduced

carriersofinorganic

semiconductor particles. One of the most important applications of inorganic
semiconductors is photocatalytic reactions. Water decomposition by sunlight using
photocatalyst is a very important research subject, because it can supply sustainableenergy with hydrogen as an energy source to the world: a hydrogen-based society. The
light conversion efficiency in photocatalytic water decomposition using inorganic
semiconductor particles has been still low, and researches aiming to improve theefficiency have been actively made. This low light conversion efficiency is attributable tothe fact that charge recombination in the grain or the grain boundary is extremely fast
as compared with oxidation/reduction reaction rates. Moreover, in conventional
research methods, samples with various sizes, shapes and aggregation degrees aremeasured by dispersing them in water. Thus, it is difficult to disentangle many kinds ofelementary processes involved in the photocatalytic reactions at the molecular level. He
has demonstrated that the carrier recombination rate of catalysts developed forpractical use is lowered by depositing cocatalysts. Also, unlike conventional
photocatalyst studies, he first discovered that water adsorption improves the holetrapping ability on the catalyst surface by controlling the number of quasi-liquid layers
on the catalyst particle surface.

5

Publication list (2018)
Yoshiyasu Matsumoto

Original Papers
1. "Molar excess enthalpies for water + ethanediol, +1,2-propanediole and +1,3-propanediole at 298.15K",
Y. Matsumoto, N, Touhara, N. Nakanishi, and N. Watanabe,
Journal of Chemical Thermodynamics 9, 801 (1977).
2. "Thermal decomposition of ammonia in shock waves",
M. Yumura, A. Asaba, Y. Matsumoto, and H. Matsui,International Journal of Chemical Kinetics 12, 439 (1980).
3. "Measurements of CARS intensity in hydrogen molecule behind shock waves",
Y. Matsumoto, H. Matsui, and T. Asaba,Transactions of Japan Society for Aeronautical and Space Sciences 26, 131 (1983).
4. "Direct excitation of triplet states in supersonic jets. Rotationally resolved 3Au-1Ag
laser induced phosphorescence",
L.H. Spangler, Y. Matsumoto and D.W. Pratt,
Journal of Physical Chemistry 87, 4781 (1983).
5. "On the origin of the rotational state dependence of the decay of intermediate casemolecules. Role of angular momentum selection rules in intersystem crossing",
Y. Matsumoto, L.H. Spangler, and D.W. Pratt,
Chemical Physics Letters 98, 333 (1983).
6. "Time-resolved fluorescence depolarization in the decay of intermediate case1
molecules. Zero-field level crossing of the molecular eigenstates of B 3u pyrazine",Y. Matsumoto, L.H. Spangler, and D.W. Pratt,
Chemical Physics Letters 95, 343 (1983).
7. "1B 3u Pyrazine. Experimental tests of the theory of radiationless transitions",
Y. Matsumoto, L.H. Spangler, and D.W. Pratt,Laser Chemistry 2, 91 (1983).
8. "Singlet-triplet perturbations in pyrimidine. Magnetic field effects on
collision-induced intersystem crossing",
Y. Matsumoto and D.W. Pratt,
Journal of Chemical Physics 81, 573 (1984).
9. "Intersystem crossing in isolated molecules. Magnetic field effects on the1
fluorescence decay behavior of B 3u pyrazine with single rovibronic level
excitation",Y. Matsumoto, L.H. Spangler, and D.W. Pratt,
Journal of Chemical Physics 80, 5539 (1984).
10. "Pure rotational spectrum of SnH 4 in the vibrational ground state observed byinfrared-radio frequency double resonance",1

Y. Ohshima, Y. Matsumoto, M. Takami, and K. Kuchitsu,
Journal of Chemical Physics 85, 5519 (1986).
11. "Free jet infrared absorption spectroscopy of the ν 3 band of TeF 6 ",Y. Matsumoto and M. Takami,
Journal of Chemical Physics 85, 3785 (1986).
12. "High-resolution infrared absorption spectroscopy of the CF 3 I ν 2 band",Y. Matsumoto, M. Takami, and P.A. Hackett,
Journal of Molecular Spectroscopy 118, 310 (1986).
13. "Free jet infrared absorption spectroscopy of the CO stretching ν 6 fundamental of
Fe(CO) 5 ",Y. Matsumoto, T. Majima, and M. Takami,
Molecular Physics 61, 1045 (1987).
14. "Infrared-microwave double resonance and diode laser spectroscopy of the ν2/ν4
bands of SnH 4 ",Y. Ohshima, Y. Matsumoto, M. Takami, S. Yamamoto, and K. Kuchitsu,
Journal of Chemical Physics 87, 5141 (1987).
15. "Free jet infrared absorption spectroscopy of stable and unstable molecular species",
M. Takami, Y. Ohshima, S. Yamamoto, and Y. Matsumoto,
Faraday Discussions of the Chemical Society 86, 1 (1988).
16. "Determination of the centrifugal-distortion-induced dipole moment of SnH 4 byinfrared double resonance Stark spectroscopy",
Y. Ohshima, Y. Matsumoto, M. Takami, and K. Kuchitsu,
Journal of Chemical Physics 88, 6747 (1988).
17. "Free-jet infrared absorption spectroscopy of the (N 2 O) 2 van der Waals complex in
the 8 µm region",
Y. Ohshima, Y. Matsumoto, M. Takami, and K. Kuchitsu,
Chemical Physics Letters 152, 294 (1988).
18. "The structure and tunneling motion of acetylene dimer studied by free-jet infraredabsorption spectroscopy in the 14 µm region",
Y. Ohshima, Y. Matsumoto, M. Takami, and K. Kuchitsu,
Chemical Physics Letters 147, 1 (1988).
19. "Comment on The structure and tunneling motion of acetylene dimer studied byfree-jet infrared absorption spectroscopy in the 14 µm region",
Y. Ohshima, Y. Matsumoto, M. Takami, and K. Kuchitsu,
Chemical Physics Letters 152, 116 (1988).
20. "Determination of the centrifugal–distortion–induced dipole moment of SnH 4 byinfrared–infrared double resonance Stark spectroscopy",
Y. Ohshima, Y. Matsumoto, M. Takami, and K. Kuchitsu,
J. Chem. Phys., 88, 6747-6750 (1988).
21. "Free jet infrared absorption spectroscopy of the ν 3 band of MoF 6 ",M. Takami and Y. Matsumoto,Molecular Physics 64, 645 (1988).
2

122. "Ultra high-resolution fluorescence excitation spectrum of B 1 pyrimidine in amolecular beam. Structural assignments, analysis of singlet-triplet perturbations,and implications for intersystem crossing in the isolated molecule",
J.A. Konings, W.A. Majewski, Y. Matsumoto, D.W. Pratt, and W.L. Meerts,
Journal of Chemical Physics 89, 1813 (1988).
23. "Sulfur hexafluoride sensitized infrared photodecomposition of iron pentacarbonyl",T. Majima, T. Ishii, Y. Matsumoto and M. Takami,
J. Am. Chem. Soc., 111, 2417-2422 (1989).
24. "SF 6 -sensitized infrared photodecomposition of Fe(CO) 5 ",T. Majima, T. Ishii, Y. Matsumoto, and M. Takami,
Journal of the American Chemical Society 111, 2417 (1989).
25. "Highly excited even Rydberg series of Lu I studied by two-step laser
photoionization spectroscopy",
H. Maeda, Y. Mizugai, Y. Matsumoto, A. Suzuki, and M. Takami,
Journal of Physics B22, L511 (1989).
1126. "Free-jet infrared spectroscopy of rare gas- BF 3 complexes in the 7 µm region",Y. Matsumoto, Y. Ohshima, M. Takami, and K. Kuchitsu,
Journal of Chemical Physics 90, 7017 (1989).
27. "Infrared-microwave double resonance and diode laser spectroscopy of the ν 1 /ν 3
dyad of SnH 4 ",L. Jörissen, Y. Ohshima, Y. Matsumoto, M. Takami, and K. Kuchitsu,
Journal of Chemical Physics 90, 2109 (1989).
28. "Mode-specific infrared photodissociation of nitric oxide dimers: High-resolution
14
15
infrared spectroscopy of ( NO) 2 and ( NO) 2 ",Y. Matsumoto, Y. Ohshima, and M. Takami,
Journal of Chemical Physics 92, 937 (1990).
29. "Anomalous band shifts in the 14 µm infrared absorption spectra of rare-gas-BF3complexes",
G.-H Lee, Y. Matsuo, M. Takami, and Y. Matsumoto,
Journal of Chemical Physics 96, 4079 (1992).
30. "Structure of adsorbed N2O on a Pt(111) surface and photodissociation at 193 nm:
effective formation of oxygen adatoms",
K.Sawabe and Y.Matsumoto,Chemical Physics Letters 194, 45 (1992).
31. "On the SF6-sensitized IR photodecomposition of Fe(CO)5: 5µm transientabsorption measurements and absorption energy measurements",
T.Majima, Y.Matsumoto, and M.Takami,
Journal of Photochemistry and Photobiology 71, 213 (1993).
32. "Free-jet infrared absorption spectroscopy of the C2H2-Ar complex in the doubly
degenerate monomer C-H bending region",
Y. Ohshima, Y. Matsumoto, M. Takami, and K. Kuchitsu,
Journal of Chemical Physics 99, 8385 (1993).
3

33. "Dynamics of the oxygen combination reaction on Pt(111) initiated byphotodissociation of N2O at 193 nm: O* + O(ad)→O2(g)",K. Sawabe, J. Lee, and Y. Matsumoto,
Journal of Chemical Physics 99, 3143 (1993).
34. "Laser-induced photochemistry of nitrous oxide on a Pt(111) surface",
K. Sawabe and Y. Matsumoto,Surface Science 283, 126 (1993).
35. "Photochemistry and photodissociation dynamics of N 2 O on metal surfaces",
Y. Matsumoto and K. Sawabe and J. Lee,
Proceedings of SPIE - The International Society for Optical Engineering 1858, 378(1993).
36. "Photochemical C-H bond activation of methane on a Pt(111) surface",
Y.A.Gruzdkov, K.Watanabe, K.Sawabe, and Y.Matsumoto,Chemical Physics Letters 227, 243 (1994).
37. "Oxygen-exchange reaction between O2 and NO coadsorbed on a Pt(111) surface:
Reactivity of molecularly adsorbed oxygen",
K. Sawabe and Y. Matsumoto,Surface Science 303, L385 (1994).
38. "Dynamics of photochemical processes of N 2 O adsorbed on metal andsemiconductor surfaces",
Y. Matsumoto and J. Lee and H. Kato and K. Sawabe
Proceedings of SPIE - The International Society for Optical Engineering 2125, 303(1994).
39. "Free jet IR spectroscopy of SiF 4 -rare gas complexes",
R.-D.Urban, L.G.Jörissen, Y.Matsumoto, and M.Takami,
Journal of Chemical Physics 103, 3960 (1995).
40. "The reactivity of molecular and atomic oxygen in oxygen-exchange reaction
between NO and O 2 coadsorbed on a Pt(111) surface",
K.Sawabe, Y.Matsumoto, J.Yoshinobu, and M.Kawai,
Journal of Chemical Physics, 103,4757 (1995).
41. "Angular distributions of N 2 in photodissociation of N 2 O adsorbed on a partially
oxidized Si(100) surface at 95K",
J.Lee, H.Kato, K.Sawabe, and Y.Matsumoto,Chemical Physics Letters, 240, 417 (1995).
42. "Surface and image-potential states on Pt(111) probed by two- and three-photon
photoemission",
I.Kinoshita, T.Anazawa, and Y.Matsumoto,Chemical Physics Letters, 229, 445 (1996).
43. "Adsorbate-localized excitation in surface photochemistry: Methane on Pt(111)",
K.Watanabe, K.Sawabe, and Y.Matsumoto,Phys. Rev. Lett., 76, 1751-1754 (1996).
44. "Laser-induced photochemistry of methane on Pt(111): Excitation mechanism anddissociation dynamics",
4

Y.Matsumoto, Y.A.Gruzdkov, K.Watanabe, and K.Sawabe,
J. Chem. Phys., 105, 4775-4788 (1996).
45. "Mechanism for the desorption of molecularly and dissociatively adsorbed methaneon Pt(111) probed by pulse-laser heating",
K.Watanabe, M.C.Lin, Y.A.Gruzdkov, and Y.Matsumoto,
Journal of Chemical Physics, 104, 5974 (1996).
46. "Adsorbed states and thermal reactions of N 2 O on Si(100) below room
temperature: Desorption induced by dissociation",
H.Kato, K.Sawabe, and Y.Matsumoto,Surface Science, 351, 43 (1996).
47. "Photochemistry of methane on a deuterium covered Pt(111) surface",
Y.A.Gruzdkov, K.Watanabe, K.Sawabe, and Y.Matsumoto,Surface Science, 363, 195 (1996).
48. "Comparative study of photochemistry of methane on Pt(111) and Pd(111)
surfaces",
K.Watanabe and Y.Matsumoto,Surface Science, 390, 250 (1997).
49. "Adsorption-state specific photodissociation dynamics of N 2 O on Si(100)",
H. Kato, J.Lee, K.Sawabe, and Y.Matsumoto,Surface Science, 386, 93 (1997).
50. "Effective conversion of CO 2 to carbonate in surface oxidation processes at
Si(100)",K. Watanabe, H.Kato and Y. Matsumoto,
The Journal of Physical Chemistry B, 102, 8042 (1998).
51. "Electronic Structure in the valence region of chemisorbed and physisorbed species
on Pd(110)",
J.Yoshinobu, M.Kawai, S.Tanaka, K.Watanabe, Y.Matsumoto, and M.Kamada,
Journal of Electron Spectroscopy and Related Phenomena, 88-91, 665 (1998).
52. "Two-photon photoemission study of CO/Pt(111)",
T.Anazawa, I.Kinoshita, and Y.Matsumoto,
Journal of Electron Spectroscopy and Related Phenomena, 88-91, 585 (1998).
53. "Phase determination of second-order surface susceptibility tensor of liquid crystal
monolayer using ultra-thin film local oscillator",
M. Sei, K. Nagayama, K. Kajikawa, H. Ishii, K. Seki, K. Kondo, Y. Matsumoto,and Y. Ouchi,
Jpn. J. Appl. Phys., 37, 1974 (1998).
54. "Effective carbonate formation induced by thermal dissociation of N 2 O on Si(100)",
H.Kato, K.Watanabe and Y.Matsumoto,Surface Science Letters, 398, L297 (1998).
55. "Enhanced THz radiation from femtosecond laser pulse irradiated InAs cleansurface", H. Ohtake, S. Ono, Z. Liu, N. Sarukura, M. Ohta, K. Watanabe and Y.
Matsumoto, Jpn. J. Appl. Phys., 38, L1186 -L1187 (1999).
56. "Photochemistry of methane on Pd/Al2O3 model catalysts: Control ofphotochemistry on transition metal surfaces"
5

K. Watanabe, Y. Matsumoto, M. Kampling, K. Al-Shamery and H-J. Freund,Angew. Chem. Int. Ed. Engl. 38, 2192 -2194 (1999).
57. "Excitation mechanisms and photochemistry of adsorbates with sphericalsymmetry",
K. Watanabe and Y. Matsumoto,
Faraday Discussions of the Chemical Society, 117, 207-211 (2000).
58. "Photochemistry of methane on Cu(111)",
K. Watanabe and Y. Matsumoto,Surface Science, 454-456, 262-266 (2000).
59. "Photo-stimulated desorption of rare gas atoms induced by UV-NIR photons at a
semiconductor surface",
K. Watanabe, H. Kato and Y. Matsumoto,Surf. Sci. Lett., 446, L134-L139 (2000).
60. "Photochemistry of N2O on Si(100): Surface photo-oxidation",
H. Kato, J. Lee, K. Sawabe and Y. Matsumoto,Surface Science, 445, 209 -223 (2000).
61. "Photoinduced elimination of oxygen at Ag(110)-p(2×1)-O: The role of surface
carbon species",
M. Ohta, K. Watanabe and Y. Matsumoto,
J Phys Chem B 105, 8170-8177 (2001).
62. "Photo-stimulated desorption of rare gas atoms adsorbed on Si(100) surfaces
modified with oxygen and deuterium",
K. Watanabe and Y. Matsumoto,J. Chem. Phys. 115, 4259-4267 (2001).
63. "Impulsive excitation of a vibrational mode of Cs on Pt(111)",
K. Watanabe, N. Takagi and Y. Matsumoto,Chemical Physics Letters, 366, 606-610 (2002).
64. "Coherent surface phonon at a GaAs(100)-c(8×2) surface",
K. Watanabe, D.T. Dimitrov, N. Takagi and Y. Matsumoto,
Phys Rev, B, 65, 235328 (2002).
65. "Anomalous quenching of electronic states of nanographene on Pt(111) bydeuterium edge termination",
I. Kinoshita, D. Ino, K. Nagata, K. Watanabe, N. Takagi and Y. Matsumoto,
Phys Rev, B, 65, 241402R (2002).
66. "Thermal decomposition of acetylene on Pt(111) studied by scanning tunnelingmicroscopy",
O. Nakagoe, N. Takagi and Y. Matsumoto,Surface Sci, 514, 414-419 (2002).
67. "Coherent phonons at a semiconductor surface",
K. Watanabe, D.T. Dimitrov, N. Takagi, and Y. Matsumoto,
AIP Conference Proceedings: Science of Superstrong Field Interactions 634, 189(2002).

6

68. "Ultrafast excited state dynamics in 3,4,9,10-perylene tetracarboxylic dianhydride(PTCDA) thin films",
D. Ino, K. Watanabe, N. Takagi and Y. Matsumoto,Chem. Phys. Lett., 383, 261-265 (2003).
69. "Role of structural fluctuation in a surface reaction studied by scanning tunnelingmicroscopy: The CO + O → CO 2 clean-off reaction on Ag(110)(2×1)-O",O. Nakagoe, K. Watanabe, N. Takagi and Y. Matsumoto,
Phys Rev Lett, 90, 226105 (4 pages) (2003).
70. "Reaction intermediates in the oxidation of methanol on a Pt(111)-(2×2)Osurface",Z. Liu, T. Sawada, N. Takagi, K. Watanabe and Y. Matsumoto,J Chem Phys, 119, 4879-4886. (2003).
71. "Structural changes of AgO chains on Ag(110) by photo- and CO-induced oxygen
elimination",
O. Nakagoe, M. Ohta, K. Watanabe, N. Takagi and Y. Matsumoto,Surface Sci. 528, 144-150 (2003).
72. "Reactivity of molecular oxygen: conversion of methanol to formate at low
temperatures on Pt(1 1 1)",
T. Sawada, Z. Liu, N. Takagi, K. Watanabe and Y. Matsumoto,Chem Phys Lett., 92, 334-339 (2004).
73. "Direct time-domain observation of ultrafast dephasing in adsorbate-substrate
vibration under the influence of a hot electron bath: Cs adatoms on Pt(111)",
K. Watanabe, N. Takagi and Y. Matsumoto,
Phys Rev Lett., 92, 57401 (4 pages) (2004).
74. "Excitation mechanism and ultrafast vibrational wavepacket dynamics ofalkali-metal atoms on Pt(111)",Y. Matsumoto, K. Watanabe and N. Takagi,
Surf Sci, 593, 110-115 (2005).
75. "Electron transfer dynamics from organic adsorbate to a semiconductor surface:Zinc-phthalocyanine on TiO 2 (110)",
D. Ino, K. Watanabe, N. Takagi, and Y. Matsumoto,J. Phys. Chem. B, 109, 18018-18024 (2005).
76. "In-situ observation of CO oxidation on Ag(110)(2×1)-O by scanning tunnelingmicroscopy: Structural fluctuation and catalytic activity",
O. Nakagoe, K. Watanabe, N. Takagi, and Y. Matsumoto,J. Phys. Chem. B, 109, 14536-14543 (2005).
77. "Mode-selective excitation of coherent surface phonons on alkali-covered metal
surfaces",
K. Watanabe, N. Takagi and Y. Matsumoto,Phys. Chem. Chem. Phys., 7, 2697-2700 (2005).
78. "Electronic structure and femtosecond electron transfer dynamics at noble
metal/tris-(8-hydroxyquinoline) aluminum interfaces",
D. Ino, K. Watanabe, N. Takagi and Y. Matsumoto,
Phys Rev, B, 71, 115427 (10 pages) (2005).

7

79. "Femtosecond wavepacket dynamics of Cs adsorbates on Pt(111): coverage andtemperature dependences",
K. Watanabe, N. Takagi and Y. Matsumoto,
Phys Rev B, 71, 085414 (2005).
80. "Coherent surface phonon dynamics at K-covered Pt(111) surfaces investigated bytime-resolved second harmonic generation",
M. Fuyuki, K. Watanabe, and Y. Matsumoto,Phys. Rev. B, 74, 195412 (6 pages) (2006).
81. "Photochemistry of cyclohexane on Cu(111)",
D. Yamaguchi, T. Matsumoto, K. Watanabe, N. Takagi and Y. Matsumoto,Phys. Chem. Chem. Phys., 8, 179-185 (2006).
82. "Electron-phonon coupling at an atomically defined interface: Na quantum well on
Cu(111)",
M. Fuyuki, K. Watanabe, D. Ino, H. Petek, and Y. Matsumoto,Phys. Rev. B, 76, 115427 (4 pages) (2007).
83. "Explosive evolution of hydrogen abstraction of water on oxidized Ag(110)
surfaces studied by scanning tunnelling microscopy",
O. Nakagoe, N. Takagi, K. Watanabe, and Y. Matsumoto,Phys. Chem. Chem. Phys., 9, 5274-5278 (2007).
84. "Photochemistry and photo-induced ultrafast dynamics at metal surfaces",
Y. Matsumoto,
Bull. Chem. Soc. Jpn. 80, 842-865 (2007).
85. "Formation of alkanethiolate-protected gold clusters with unprecedented core sizes
in the thiolation of polymer-stabilized gold clusters",
H. Tsunoyama, P. Nickut, Y. Negishi, K. Al-Shamery, Y. Matsumoto, and Tatsuya
Tsukuda,J. Phys. Chem. C, 111, 4153-4158 (2007).
86. "Thermal and photochemical reactivity of oxygen atoms on gold nanocluster
Surfaces",
T. Matsumoto, P. Nickut, H. Tsunoyama, K. Watanabe, T. Tsukuda, K. Al-Shamery,and Y. Matsumoto,Surf. Sci. 601, 5226-5231 (2007).
87. "Deposition and fabrication of alkanethiolate gold nanocluster films on TiO 2 (110)
and the effects of plasma etching",
T. Matsumoto, P. Nickut, T. Sawada, H. Tsunoyama, K. Watanabe, T. Tsukuda, K.
Al-Shamery, and Y. Matsumoto,Surf. Sci. 601, 5121-5126 (2007).
88. "Structure and thermal fluctuation of one-dimensional AgO chains on Ag(110)
surfaces studied with density functional theory and Monte Carlo simulations",
I. Nakai, Y. Matsumoto, N. Takagi, and S. Okazaki,
J. Chem. Phys, 129, 154709 (8 pages) (2008).
89. "Ultrafast electron and lattice dynamics at potassium-covered Cu(111) surfaces",
K. Watanabe, K.-I. Inoue, I. F. Nakai, M. Fuyuki, and Y. Matsumoto,Phys. Rev. B, 80, 075404 (10 pages) (2009).

8

90. "Surface-mediated visible-light photo-oxidation on pure TiO 2 (001)",
H. Ariga, T. Taniike, H. Morikawa, M. Tada, B. K. Min, K. Watanabe, Y.
Matsumoto, S. Ikeda, K. Saiki, and Y. Iwasawa,J. Am. Chem. Soc., 131, 14670-14672 (2009).
91. "Magnetic circular dichroism photoemission electron microscopy using laser andthreshold photoemission",
T. Nakagawa, K. Watanabe, Y. Matsumoto, and T. Yokoyama,
J. Physics: Condensed Matter, 21, 314010 (2009).
92. "Two-photon photoemission magnetic circular dichroism and its energy
dependence",
T. Nakagawa, I. Yamamoto, Y. Takagi, K. Watanabe, Y. Matsumoto, and T.
Yokoyama, Phys. Rev. B, 79, 172404 (4 pages) (2009).
93. "Ultrafast vibrational energy transfer in the layers of D 2 O and CO on Pt(111)
studied with time-resolved sum-frequency-generation spectroscopy",
M. Nagao, K. Watanabe, and Y. Matsumoto,J. Phys. Chem. C, 113, 11712-11719 (2009).
94. "Molecular structure and carrier distributions at semiconductor/dielectric interfaces
in organic field-effect transistors studied with sum frequency generation
microscopy",
I. F. Nakai, M. Tachioka, A. Ugawa, T. Ueda, K. Watanabe, and Y. Matsumoto,Appl. Phys. Lett., 95, 243304 (3 pages) (2009).
95. "Nonadiabatic coupling between C-O stretching and Pt substrate electrons
enhanced by frustrated mode excitations",
K. Watanabe, K.-I. Inoue, I. F. Nakai, and Y. Matsumoto,Phys. Rev. B, 81, 241408 (4 pages) (2010).
96. "Mechanism of enhancement in absorbance of vibrational bands of adsorbates at a
metal mesh with subwavelength hole arrays",
J. Etou, D. Ino, D. Furukawa, K. Watanabe, I. F. Nakai, and Y. Matsumoto,Phys. Chem. Chem. Phys., 13, 5817-5823 (2011).
97. "Adsorbate-localized versus substrate-mediated excitation mechanisms forgeneration of coherent Cs-Cu stretching vibration at Cu(111) ",K. Watanabe, Y. Matsumoto, T. Yasuike and K. Nobusada,J. Phys. Chem. A, 115, 9528-9535 (2011).
98. "Instantaneous vibrational frequencies of diffusing and desorbing adsorbates:
CO/Pt(111)",
K.-I. Inoue, K. Watanabe, and Y. Matsumoto,J. Chem. Phys., 137, 024704-6 (2012).
99. "Nuclear wavepacket dynamics of alkali adsorbates on metal surfaces studied bytime-resolved second harmonic generation",
K. Watanabe and Y. Matsumoto,Physics Research International, 2012, 172987 (2012).
100. "Toward photochemistry of integrated heterogeneous systems",
Y. Matsumoto,J. Chem. Phys., 137, 091705 (2012).

9

101. "All-optical control and visualization of ultrafast two-dimensional atomic
motions in a single crystal of bismuth",
H. Katsuki, J. Delagnes, K. Hosaka, K. Ishioka, H. Chiba, E. Zijlstra, M. Garcia, H.
Takahashi, K. Watanabe, M. Kitajima, Y. Matsumoto, K. Nakamura, and K. Ohmori,Nat Commun, 4, 2801 (2013).
102. "Retrieval of electronic spectra of charge carriers in organic field-effecttransistors from charge modulation reflectance spectra distorted by optical
Interference",
K. Miyata, Y. Ishino, K. Watanabe, K. Miwa, T. Uemura, J. Takeya, and Y.
Matsumoto,Jpn. J. Appl. Phys., 52, 062401(4 pages) (2013).
103. "Electron-phonon coupling dynamics at oxygen evolution sites ofvisible-light-driven photocatalyst: Bismuth vanadate",
N. Aiga, Q. Jia, K. Watanabe, A. Kudo, T. Sugimoto, and Y. Matsumoto,J. Phys. Chem. C, 117, 9881-9886 (2013).
104. "Molecular-scale surface structures of oligo(ethylene glycol)-terminatedself-assembled monolayers investigated by frequency modulation atomic force
microscopy in aqueous solution",
N. Inada, H. Asakawa, Y. Matsumoto, and T. Fukuma,
Nanotechnology, 25, 305602 (2014).
105. "Ultrafast exciton dynamics in dinaphtho[2,3-b:2’3’-f]thieno[3,2-b]- thiophene
thin films",
Y. Ishino, K. Miyata, T. Sugimoto, K. Watanabe, Y. Matsumoto, T. Uemura, and J.
Takeya,Phys. Chem. Chem. Phys., 16, 7501 - 7512 (2014).
106. "Coherent phonon dynamics in singlet fission of rubrene single crystal",
K. Miyata, S. Tanaka, T. Sugimoto, K. Watanabe, T. Uemura, J. Takeya, and Y.
Matsumoto,
Proceedings of the 19th International Conference on Ultrafast Phenomena XIX,
162 (2014).
107. "Effects of cocatalyst on carrier dynamics of a titanate photocatalyst with layered
perovskite structure",
M. Yabuta, T. Takayama, K. Shirai, K. Watanabe, A. Kudo, T. Sugimoto, and Y.
Matsumoto,J. Phys. Chem. C, 118, 10972-10979 (2014).
108. "Applications of time-domain spectroscopy to electron-phonon coupling
dynamics at surfaces",
Y. Matsumoto,
The Chemical Record, 14, 952-963 (2014).
109. "Microscopic hole-transfer efficiency in organic thin-film transistors studied withcharge-modulation spectroscopy",
K. Miyata, S. Tanaka, Y. Ishino, K. Watanabe, T. Uemura, J. Takeya, T. Sugimoto,and Y. Matsumoto,Phys. Rev. B, 91, 195306 (2015).
110. "Enhancement of the exciton coherence size in organic semiconductor by alkyl
chain substitution",
10

S. Tanaka, K. Miyata, T. Sugimoto, K. Watanabe, T. Uemura, J. Takeya, and Y.
MatsumotoJ. Phys. Chem. C, 120, 7941-7948 (2016).
111. "Effect of water adsorption on carrier trapping dynamics at the surface of anatase
TiO 2 nanoparticles",K. Shirai, T. Sugimoto, K. Watanabe, M. Haruta, H. Kurata, and Y. Matsumoto,
Nano Lett. 16, 1323-1327 (2016).
112. "Emergent high-Tc ferroelectric ordering of strongly correlated and frustrated
protons in a heteroepitaxial ice film",
T. Sugimoto, N. Aiga, Y. Otsuki, K. Watanabe, and Y. Matsumoto,
Nature Physics 12, 1063-1068 (2016).
113. "Disentangling multidimensional nonequilibrium dynamics of adsorbates: COdesorption from Cu(100)",
K.-I. Inoue, K. Watanabe, T. Sugimoto, Y. Matsumoto, T. Yasuike,Phys. Rev. Lett., 117, 186101 (2016).
114. "Coherent singlet fission activated by symmetry breaking",
K. Miyata, Y. Kurashige, K. Watanabe, T. Sugimoto, S. Takahashi, S. Tanaka, J.
Takeya, T. Yanai, and Y. Matsumoto,
Nature. Chemistry 9, 983-989 (2017).
115. "Unveiling subsurface hydrogen-bond structure of hexagonal water ice",
Y. Otsuki, T. Sugimoto, T. Ishiyama, A. Morita, K. Watanabe, and Y. Matsumoto,Phys. Rev. B 96, 115405 (2017).
116. "Particle size dependence of carrier dynamics and reactivity of photocatalyst
BiVO 4 probed with single-particle transient absorption microscopy",
M. Yabuta, A. Takeda, T. Sugimoto, K. Watanabe, A. Kudo, and Y. Matsumoto,J. Phys. Chem. C 121, 22060 (2017).
117. "Origins of emergent high-Tc ferroelectric ordering in heteroepitaxial ice film:
Sum-frequency generation vibrational spectroscopy of H 2 O and D 2 O ice films on
Pt(111)",
Phys. Rev. B, 97, 75410 (2018).
118. "Water-assisted hole trapping at highly curved surface of nano-TiO 2
photocatalyst ",K. Shirai, G. Fazio, T. Sugimoto, D. Selli, L. Ferraro, K. Watanabe, M. Haruta, B.
Ohtani, H. Kurata, C. D. Valentin, and Y. Matsumoto,J. Am. Chem. Soc. 140, 1415 (2018).
119. "Conformational Planarization vs Singlet Fission: Distinct Excited-State
Dynamics of Cyclooctatetraene-Fused Acene Dimers"
T. Yamakado, S. Takahashi, K. Watanabe, Y. Matsumoto, A. Osuka, and S. Saito,
Angew. Chem. Int. Ed. 57, 5438 (2018).

11

Reviews and Books
1.

"Free jet infrared spectroscopy of weakly bound complexes",
M. Takami, Y. Ohsihima, and Y. Matsumoto, in Studies in Physical and Theoretical
Chemistry, vol. 82, pp. 55-95 (1994), edited by K. Kuchitsu.

2.

“Coherent vibrations of adsorbates induced by femtosecond laser excitation”
Y. Matsumoto and K. Watanabe
Chemical Reviews, 106, 4234-4260 (2006).

3. “Photoinduced coherent nuclear motion at surfaces: Alkali overlayers on metals”
Y. Matsumoto and K. Watanabe,
U. Bovensiepen; H. Petek and M. Wolf (Eds.)“Dynamics at Solid State Surfaces and Interfaces 11 1: Current Developments”,
239-262 (2010).
4.

“Ultrafast dynamics of adsorbates at solid surfaces”,
K. Watanabe and Y. Matsumoto
Laser Kenkyu (in Japanese), 40, 766-773 (2012).

5.

“Vibrational dynamics of adsorbates on metal surfaces induced by nonadiabatic
excitation “
K. Watanabe and Y. Matsumoto
Hyoumen Kagaku (in Japanese), 35 650-655 (2014).

6.

“Photo-induced non-equilibrium dynamics of adsorbates on metal surfaces”
T. Yasuike, K. Watanabe, and Y. Matsumoto
Nihon Butsuri Gagakaishi (in Japanese), 73, 297-302 (2018).

12