bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polarization of terahertz radiation driven by incommensurate two-color laser pulses
Authors: Li Y N , Wang G L , Zhang L , Jiao Z H , Zhao S F , Zhou X X 
Published: June 2020

Synopsis
We investigate the polarization characteristics of terahertz (THz) emission from gaseous plasma induced by the two-color incommensurate femtosecond laser fields, which contains a circularly polarized laser field and a linear pulse. Our simulations show that strong linearly, elliptically, and circularly polarized THz radiation can be generated, by choosing appropriate wavelength, carrier-envelope phase and intensity for linear pump pulse.
Spectroscopic diagnostic of isolated dense plasma generated through laser driven gold hohlraum radiation
Authors: Ren J , Zhao Y , Deng Z , Qi W , Cheng R , Wang X , Liu W , Ma B , Yin S , Chen B , Feng J , Wang S , Fang Q , Cui B , Zhou X , Zhou W , Cao L 
Published: June 2020

Synopsis
Through indirectly heating a TAC foam with ns laser driven gold hohlraum radiation, isolated, highly homogeneous and long-living dense ionized matter was generated in laboratory. This provide a fantastic sample for investigation of dense plasma science and technology. The emission spectra of the plasma with time, spatial and spectral resolution were measured with various techniques. The temperature and electron density are precisely diagnosed on the basis of the spectra.
Fast atom interaction with surfaces at grazing incidence: classical and quantum scattering applied to thin film growth
Authors: Staicu Casagrande E M , Momeni A , Khemliche H 
Published: June 2020

Synopsis
Characterization of solid surfaces with heavy particles has mainly relied on the use of ions at energies from keV to MeV. Although atomic diffraction at thermal energies has been known since 1930 and became popular in the 1970’s as a powerful surface characterization technique, it is nowadays rather confidential. Unexpectedly, diffraction with atoms in the keV range has also been observed despite the tininess of the de Broglie wavelength. Grazing Incidence Fast Atom Diffraction (GIF AD) has now become mature and allows the real-time analysis, during the growth, of the most fragile layers.
Investigation of the potential sputtering process on the solid Ne surfaces induced by grazing incidence of slow Ar
q+
Authors: Sawa H , Ueta H , Hirayama T 
Published: June 2020

Synopsis
For the quantitative investigation of the potential sputtering process on the surface of noble gas solid, we have performed the coincidence measurement of the ions desorbed and projectiles scattered from solid Ne surfaces, due to 3 keV Ar6+ impacts at grazing incidence angles. The dependence of

Ne

n
+

desorption on the charge state of the scattered Ar projectiles is found.
Theoretical models of stopping and ionization of metallic targets and oxydes bombarded by H2
+ molecules
Authors: Archubi C D , Arbó D , Arista N R 
Published: June 2020

Synopsis
We study the vicinage effects in the interaction of H2
+ projectiles with C, Al, Si, Al2O3 and SiO2 targets considering the excitation of inner shells. On one side we extend the use of the semiclassical impact-parameter model for the excitation of atomic shells, considering quantum corrections and the role of target screening in the vicinage effects. On the other hand, we adapt our extended wave packet model (EWPM) [3] to the calculation of stopping ratios and ionization cross sections for correlated ions. Lindhard model is used to evaluate valence electrons contributions.
Non-statistical fragmentation of C60 and the formation of endohedral defect fullerenes
Authors: Stockett M H , Wolf M , Gatchell M , Schmidt H T , Zettergren H , Cederquist H 
Published: June 2020

Synopsis
We report the first observation of the endohedral defect fullerene complex

He@C

59
−

and the first measurement of the threshold displacement energy of a fullerene.
IRMPD spectroscopy and QC calculations on functionalized gold nanocluster ions
Authors: Desfrançois C , Beydoun A , Lecomte F , Nieuwjaer N , Manil B , Scuderi D 
Published: June 2020

Synopsis
Many studies are devoted to functionalized metallic nanoparticles, for many applications: in Physics, due to their localized surface plasmon resonances; in Chemistry, due to their specific catalytic properties that depend on their surface nature; in Biology, due to their optical or magnetic properties coupled to their potential for targeting and vectorization of bioactive molecules within living cells. In this last domain, gold and silver nanoparticles are especially of interest and, for the control of their biological effects, it is very important to have a fine knowledge of the structural properties and the chemical stabilities of their functional ligands.
Towards prediction of the rates of antihydrogen positive ion production in antihydrogen-excited positronium reaction
Authors: Yamashita T , Kino Y , Hiyama E , Piszczatowski K , Jonsell S , Froelich P 
Published: June 2020

Synopsis
We present the 4-body calculation of the antihydrogen-positronium scattering aiming at the prediction of cross sections for the production of antihydrogen positive ions. The latter are expected to be a useful source of ultra-cold atoms for the test of matter-antimatter gravity. We convert the Schrödinger equation to a set of coupled integro-differential equations that involve intermediate states and are solved using the compact finite difference method. We will present the investigation of the rearrangement reaction between the ground-state antihydrogen atom and the excited positronium.
Configuration space method to calculate rearrangement matrix elements
Authors: Fursa D V , Utamuratov R , Kadyrov A S , Bray I 
Published: June 2020

Synopsis
A new method based on partial-wave expansion of the Ps radial wave functions has been developed for calculating the Ps-formation matrix elements. The method utilises the Euler-Wijngaarden tansformation to accelerate slowly converging series. The integrals in the method are free of the Coulomb singularity that appears in previously used momentum-space methods and therefore more straightforward to apply to complex and charged targets. The results are compared with the existing benchmark calculations for positron scattering on H and He+ targets.
Electron and positron scattering from pyridine
Authors: Sinha N , Sahoo A K , Antony B 
Published: June 2020

SynopsisAdvancement in medical technology is a much needed demand in the present scenario. To stem a robust technology, one should be aware of the knowledge behind such sciences. In view of this, we investigate here the interaction of biomolecules with the most elementary particle, electron along with its anti-particle positron. The cross sections computed here using SCOP formalism for pyridine molecule will be useful for simulations of bio molecular systems. We further compare the cross sections for e−and e+scattering extracting some rudimentary information about these basic interactions.
Performance of a scintillator-based ion detector for CRYRING@ESR
Authors: Menz E B , Hahn C , Pfäfflein P , Weber G , Stöhlker Th 
Published: June 2020

Synopsis
A detector based on the scintillator material YAP:Ce and capable of counting single ions is present-ed. The detector consists of a YAP:Ce crystal and a light guide operating in ultra high vacuum and a convention-al photomultiplier outside the vauum. The crystal demonstrated the necessary radiation hardness against heavy ion irradiation. The detector has been commissioned at CRYRING@ESR and its detection capabilities have been confirmed with beam from the local source.
Spontaneous decay of small carbon cluster dianions

Cn2−

(n=7-11)
Authors: Najeeb P K , Stockett M H , Anderson E K , Eklund G , Kristiansson M K , Rosén S , Chartkunchand K C , Gnaser H , Golser R , Hanstorp D , Cederquist H , Schmidt H T , Zettergren H 
Published: June 2020

Synopsis
We have studied the stabilities of small carbon dianion clusters,

C

n

2
−

(n = 7 – 11) in the cryogenic electrostatic ion storage ring, DESIREE. We observe spontaneous electron emission for tens of milliseconds, where dianions containing an even number of carbons decay slower in comparison to their neighbouring cluster sizes. For all the systems considered here, we find that there is a component which is stable at least on the time scales of hundreds of milliseconds.
Coupling of a velocity-map imaging spectrometer with an electron cyclotron resonance ion source
Authors: Concina B , Lépine F , Martin S , Bordas C 
Published: June 2020

Synopsis
A velocity-map imaging spectrometer has been coupled with an electron cyclotron resonance ion source for the first time. This new set-up aims at the study of the photodetachment of benchmark molecular anions, especially thermionic emission. First measurements have been taken on SF6
−.
Electron transfer to phenyl boronic acid upon potassium collisions
Authors: da Silva F Ferreira , Pamplona B , Mendes M , García G , Limão-Vieira P 
Published: June 2020

Abstract
We present negative ion formation from collisions of neutral potassium atoms with neutral phenylboronic acid C6H5B(OH)2 molecules in the lab frame energy range from 10 to 1000 eV. From the assignment of the negative ion time-of-flight (ToF) mass spectra, BO− is the main fragment detected at energies below 100 eV, however above 100 eV BO2
− is the predominant fragment accounting on average for 30% of the total anion yield for collision energies above 250 eV. The rich fragmentation pattern results in the formation of more than thirty fragment anions, with twenty boron containing ions.
Resonances in molecules and molecular clusters
Authors: Gorfinkiel Jimena D 
Published: June 2020

Abstract
Resonances play an important role in a number of atomic and molecular processes. Identifying and characterising resonances in electron scattering is essential as they can both enhance a number of processes (e.g. electronic and vibrational excitation) and are crucial in others like dissociative electron attachment and dissociative recombination. We discuss recent theoretical studies of shape and core-excited resonances, both in isolated molecules of biological relevance and in small molecular clusters. The latter are investigated to understand the effect of the environment, in particular hydration, in electron collisions in biological matter.
Towards prediction of the rates of antihydrogen positive ion production in collision of antihydrogen with excited positronium
Authors: Yamashita T , Kino Y , Hiyama E , Piszczatowski K , Jonsell S , Froelich P 
Published: June 2020

Abstract
We present a 4-body calculation of scattering between an antihydrogen atom (

H
¯

) and a positronium (Ps) aiming at the prediction of cross sections for the production of antihydrogen positive ions

H
¯

+

. The antihydrogen positive ions are expected to be a useful source of ultra-cold anti-atoms for the test of matter-antimatter gravity. We convert the Schrödinger equation to a set of coupled integro-differential equations that involve intermediate states which facilitate the internal region description of the scattering wavefunction. They are solved using a compact finite difference method. Our framework is extended to scattering between an excited Ps and H. Cross sections of the reactions, Ps (1s/2s/3s)

H
¯

→

e
−

+

H
¯

+

, in s-wave collisions, are calculated. It is found that the reactions originating from Ps (1s/2s) +

H
¯

produce

H
¯

+

with a constant cross section within 0.05 eV above the threshold while the reaction cross section from Ps (3s) decreases as the collision energy increases in the same energy interval. Just above the threshold, the cross section of

H
¯

+

production from Ps (3s) +

H
¯

in s-wave collision is 7.8 times larger than that from Ps (1s) +

H
¯

in s-wave and 2.3 times larger than that from Ps (2s) +

H
¯

in s-wave. The near-threshold de-excitation reaction from Ps (3s) +

H
¯

occurs more rapidly than the

H
¯

+

production.
Cold collisions of

C2−

with Li and Rb atoms in hybrid traps
Authors: Kas Milaim , Liévin Jacques , Vaeck Nathalie , Loreau Jérôme 
Published: June 2020

Abstract
We present a theoretical investigation of reactive and non-reactive collisions of Li and Rb atoms with

C
2
−

molecular anions at low temperatures in the context of sympathetic cooling in hybrid trap experiments. Based on accurate potential energy surfaces for the singlet and triplet states of the Li–

C
2
−

and Rb–

C
2
−

systems, we show that the associative electronic detachment reaction is inefficient but that it occurs with a large rate for collisions involving excited states of either Li/Rb or

C
2
−

. We also investigate rotationally inelastic collisions in order to explore the cooling of the translational and rotational degrees of freedom of

C
2
−

in hybrid ion-atom traps. The effect of micromotion is taken into account by considering Tsallis distributions of collision energies. We show that the translational cooling occurs much more rapidly than rotational cooling and that the presence of excited atoms leads to losses of anions on a timescale comparable to that of rotational cooling.
Temporal-spatial double slit interference of photoelectron
Authors: Liang H , Xiao X R , Peng L Y 
Published: June 2020

Synopsis
The electron displacement induced by an ultrashort pulse is theoretically investigated. We propose and numerically demonstrate a scheme to accurately measure the electron displacement using a ruler formed by the interfering spirals in the photoelectron momentum distribution generated by two oppositely circularly polarized pulses. It can be understood as a temporal double-slit with an additional spatial shift on one slit.
The single ionization of helium with energy-selected extreme ultraviolet photons
Authors: Zhang M , Hai B , Zhao D M , Dong D P , Lei J T , Morishita T , Zhao S F , Zhang S F , Ma X 
Published: June 2020

Synopsis
The platform dedicated to studies of extreme ultraviolet (EUV) laser on atom/molecule has been established recently at the Institute of Modern Physics, CAS, Lanzhou. The single ionization of helium with EUV photons of about 37.5 eV was conducted. Photoelectron angular distributions are obtained and compared with theoretical calculations from TDSE method.
Amplification of a train of attosecond pulses in a plasma-based X-ray laser driven by an IR field
Authors: Antonov V A , Han K C , Khairulin I R , Kocharovskaya O 
Published: June 2020

Synopsis
We suggest a technique to amplify a train of attosecond pulses, produced via high-harmonic generation of an infrared laser field, in active medium of a plasma-based X-ray laser driven by a replica of the same IR field as used to produce high harmonics forming a train of attosecond pulses.
Angle-resolved time delays in photoionization with a high repetition rate laser source
Authors: Srinivas H , Shobeiryt F , Bharti D , Harth A , Pfeifer T , Moshammer R 
Published: June 2020

Synopsis
Complete measurements of photoionization include both time-resolved and angle-resolved mapping of the atomic and molecular dynamics. The setup described in this work is suited to be used for attosecond pump-probe experiments as well as providing insights into the angular dependencies of photoionization.
A 17-W, mid-IR parametric amplifier driven by a Yb:YAG thin-disk laser and its application to high harmonic generation in solids
Authors: Kanai T , Lee Y , Seo M , Kim D E 
Published: June 2020

Synopsis
We developed a carrier-envelope phase-stable, KTA parametric amplifier delivering 17-W mid-IR pulses (signal: 1.4 micron, idler: 3.8 micron) at a 100-kHz rep. rate. The key aspect is stable generation of supercontinuum seed pulses with 1.4-ps pulses, which are the longest for supercontinuum generation on its longer wavelength side. This technology offers a robust architecture with characteristics of stable phases, simple dispersion management, wavelength tunability for 1.3-4.5 micron, and this high photon flux opens novel statistics-driven spectroscopy for rare events in strong field physics.
Photoionization of neutral magnesium and sodium anion in C60 versus C240
Authors: Magrakvelidze M , Shields D , De R , Manson S T , Chakraborty H S 
Published: June 2020

Synopsis
We investigate the effects of confinement and electron correlation on the photoemission properties of Mg and Na− endohedrally sequestered in C60 versus C240. Cross sections and Wigner-Smith time delays for emissions from various electronic levels are computed and analyzed in time-dependent local density approximation.
Delayed relaxation of highly excited naphthalene cations
Authors: Reitsma G , Hummert J , Dura J , Loriot V , Vrakking M J J , Lépine F , Kornilov O 
Published: June 2020

Synopsis
The efficiency of energy transfer in ultrafast electronic relaxation of molecules depends strongly on the complex interplay between electronic and nuclear motion. In this study we use wavelength-selected XUV pulses to induce relaxation dynamics of highly excited cationic states of naphthalene. Surprisingly, the observed relaxation lifetimes increase with the cationic excitation energy. We propose that this is a manifestation of a quantum mechanical population trapping that leads to delayed relaxation of molecules in the regions with a high density of excited states.
Efficient table-top beamline for attosecond molecular and solid-state dynamics at the carbon K-edge
Authors: Barreau L , Ross A D , Kraus P M , Garg S , Neumark D M , Leone S R 
Published: June 2020

Synopsis
A harmonic continuum extending up to 375 eV is generated from 750 μJ, 9 fs mid-IR pulses centered at 1300 nm. The development of this source and its use for attosecond transient absorption spectroscopy experiments at the carbon K-edge are discussed.
Low-order harmonic generation of helium atom in an intense laser fields
Authors: Zhou J-W , Jiao Z-H , Li P-C , Zhou X-X 
Published: June 2020

Synopsis
We calculate the low-order harmonic generation (LOHG) by solving three-dimensional time-dependent Schrödinger equation with an accurate model potential of helium (He) atom in an intense laser fields. The satellite-peak structures of the LOHG are obtained in the harmonic spectra of He atom. We analyze the emission properties of the LOHG by employing a synchrosqueezing transform technique. Our results show that the satellite-peak structures contain the information of the bound states and the Stark shift of He atom in an intense laser fields.
Coupling of autoionizing states by a chirped laser pulse
Authors: Žitnik M , Mihelič A , Bučar K , Hrast M , Barba Ž , Krušič Š , Ribič P Rebernik , Urbančič J , Ressel B , Stupar M , Poletto L , Coreno M , Gauthier D , Ninno G De 
Published: June 2020

Synopsis
We have observed the autoionization of the laser-coupled 2s2p
1
Po
and 2p
2
1
Se
resonances in helium. The ions were collected while varying the frequency and delay of the extreme-ultraviolet (EUV) excitation pulse with respect to the linearly chirped visible (VIS) laser pulse. From the measured frequency-delay map the Autler-Townes splitting, the EUV-VIS cross-correlation and the linear chirp parameter were extracted.
High-energy ultrafast mid-IR optical parametric amplifier for strong-field science
Authors: Faccialà D , Musheghyan M , Geetha P Prasannan , Pusala A , Crippa G , Ciriolo A G , Devetta M , Vozzi C , Stagira S 
Published: June 2020

Synopsis
We present a high-energy mid-infrared optical parametric amplifier source tunable between 2.8 and 3.8 μm for strong-field applications. We exploited this source in combination with a 800 nm source for generating high-order harmonics in atoms and molecules in a two-color pulse scheme.
Floquet formalism for multiphoton dynamics in superconducting quantum circuits
Authors: Jooya H Z , Sadeghpour H R 
Published: June 2020

Synopsis
High-order nonlinear multiphoton dynamics of closed and open periodically driven quantum systems are studied within the semiclassical Floquet formalism. Multiphoton up/down frequency conversion in a super-conducting circuit is realized and faithfully reproduced with calculations. The absorption spectra are suppressed at sharp avoided crossings of the Floquet states. We include the effect of coupling to cavity by time evolving the master equation. The characteristics of the time-averaged absorption spectra are investigated by probing details near and around the exceptional points where suppression occurs.
Frustrated tunnel ionization of argon by intense few-cycle infrared laser radiation
Authors: Pauly T , Smith N , Douguet N , Bartschat K 
Published: June 2020

Synopsis
We report results for strong-field ionization and excitation of argon obtained by solving the time-dependent; Schrödinger equation in a single-active-electron model. We analyze the process of “frustrated tunnel ionization” and its dependence on the potential and a variety of laser parameters, such as the intensity, carrier-envelope phase, and ellipticity. Our calculations support current experimental work at Griffith University.
Branching ratio coherent control in ultrafast bond making
Authors: Amitay Z , Liat L , Reich D M , Kosloff R , Koch C P 
Published: June 2020

Synopsis
Coherent control of bond making (photoassociation) is crucial for the realization of a new photochemistry, where a laser field is actively photo-driving the irradiated system in a coherent way from the initial state of reactants to the final state of desired products. In a significant step forward, we experimentally demonstrate here coherent control over the photoassociation branching ratio to different target states of the generated molecule. The model process is strong-field multiphoton femtosecond photoassociation of thermally hot magnesium atoms into bound magnesium dimer molecules.
Dependence of the returning electron wave packet on the model potential for high-energy plateau photoelectron spectra
Authors: Chen J H , Fan J , Li X Y 
Published: June 2020

Synopsis
In the present work, we study the two-dimensional momentum distributions of high-energy plateau photoelectrons of a model-atom in a linearly polarized few-cycle laser pulse. Based on the improved strong-field approximation (ISFA), it is found that the returning electron wave packet is dependent of the model potential.
Super-interference in atomic photoionization: Moiré patterns in momentum maps
Authors: Dran M , Arbó D G 
Published: June 2020

Synopsis
We theoretically investigate on the origin of lateral ring structures in the doubly differential momen-tum distribution for atomic ionization by laser pulses in the midinfrared spectral region. We demonstrate that such structures stems from the interplay between intra- and intercycle interference patterns which work as two separate grids in the two-dimensional momentum domain. When the periods of the two grids (intra- and intercycle) are similar, moiré patterns arise as concentric rings at high electron kinetic energy.
Photoelecton emission from silver nanoparticles after laser irradiation
Authors: Budai L , Márton Z , Dombi P , Tökési K 
Published: June 2020

Synopsis
We present theoretical study of photoelectron emission from silver nanoparticles after laser irradiation based on the classical simulation of the electron trajectories. The individual electron trajectories were analized with and without taken into account the image force between the emitted electron and its mirror charge. We show also the calculated energy spectra in comparision with the available experimental data. We observed a significant effect of the image acceleration to the calculated electron spectra.