bluuebunny/crossref_metadata_2025_split huggingface dataset:
Theory of light scattering by surface polaritons in gyrotropic media
Authors: Maradudin A. A. , Wallis R. F. 
Published: May 2005

AbstractIn recent years considerable effort has been devoted to the experimental and theoretical investigation of surface polaritons in dielectric and conducting media. In metals and semiconductors containing free carriers, interesting phenomena are exhibited by surface plasmon polaritons in the presence of an external magnetic field. A useful tool for probing such phenomena is the inelastic scattering of light. The theory of light scattering from surface polaritons can be conveniently developed in terms of the electromagnetic Green's tensor for the medium with a free surface. We have calculated the elements of the electromagnetic Green's tensor for a homopolar medium containing free carriers which is placed in a constant magnetic field normal to the surface. An expression for the light scattering cross‐section has been derived. Other applications of the electromagnetic Green's tensor are discussed.
A note on a quantum theory of surface enhanced Raman scattering
Authors: Lee Ting‐Kuo , Birman Joseph L. 
Published: May 2005

AbstractA ‘coupled mode’ set of eigenfunctions is obtained for investigations of the quantum theory of surface enhanced Raman scattering by a physiadsorbed molecule on a metal surface. The enhancement ratio R(ω) for scattering cross‐section of adsorbed to free molecules is calculated. The theory is applied to the pyridine on silver system. In the classical limit, using a geometry with flat silver surface, the ‘image enhancement’ model is recovered, and a large enhancement can be forced if unrealistic values of parameters are used. In the correct quantum theory a sharply peaked enhancement of about 10−3 of that reported can be obtained at laser energy about 3.7 eV. The conventional image model is thus not supported by the quantum theory. Surface roughness needs to be incorporated into this coupled mode theory.
Spectroscopy using laser‐pumped laser oscillators
Authors: Deshazer L. G. 
Published: May 2005

AbstractTransition cross‐sections were measured independent of active atom concentration and extrinsic loss using a laser‐pumped CW laser oscillator. Extrapolation of the linear input–output characteristic of a CW oscillator to null pumping rate determined the saturation power from which is determined the laser cross‐section. Laser cross‐sections were measured for Nd3+ in YAG and YVO4.
High pressure and variable temperature study of the Raman spectrum of camphor
Authors: Wilkinson G. R. , Medina J. A. , Sherman W. F. 
Published: May 2005

AbstractRaman spectra of d‐camphor in the lattice mode region are presented for sample pressures in the range up to 25 kbar and temperatures between 77 K and 350 K. Out of the five different structures that have been studied, the Raman spectra have previously only been available for the two that are stable under zero pressure conditions.
On the reststrahlen spectrum of yttrium iron garnet
Authors: Häussler K. M. , Falge H. J. , Brandmüller J. 
Published: May 2005

AbstractThe reststrahlen spectrum of yttrium iron garnet is investigated by infrared reflection measurements using an ATR‐hemicylinder or an externally applied magnetic field, respectively. Data on infrared inactive phonons and the magnetic influence on the reststrahlen bands are reported.
Light scattering from laser annealed ion implanted semiconductors
Authors: Balkanski M. , Morhange J. F. , Kanellis G. 
Published: May 2005

AbstractLight scattering is shown to be a powerful tool for the investigation of laser annealed ion implanted semiconductors. The results reported here concern boron implanted in silicon which shows up as localized mode where in substitutional position and boron‐phosphorous pairs giving also localized modes. The characteristics of the amorphous layer obtained after ion inplantation are also investigated by Raman spectroscopy and detailed results on the amorphous crystalline transition achieved by laser annealing are presented.
The anomalous temperature variation of the symmetric stretching vibration νs(H2O) in hexa‐aqua metal (II) hexafluorosilicate (IV)
Authors: Jenkins T. E. , Lewis J. 
Published: May 2005

AbstractThe anomalous temperature dependence of the linewidth of the νs(H2O) symmetric stretch vibration in hexa‐aquo metal (II) hexafluorosilicate (IV) salts is discussed in terms of anharmonic interactions. It is shown that the main contribution to the linewidth is an elastic scattering process between νs(H2O) and the torsional vibration of the water molecules leading to a pure vibrational dephasing. Contributions to the linewidth due to inelastic decay into other vibrational states are also discussed.
Vibrational spectroscopic studies of a new class of oligophosphate glasses of biological interest
Authors: Bertoluzza A. , Fagnano C. , Fawcett V. , Long D. A. , Taylor L. H. 
Published: May 2005

AbstractVitreous biomaterials with chemical composition similar to that of bone may be formed by treating mixtures of vitreous sodium polyphosphate, Graham's salt and hydroxylapatite. The Raman and infrared spectra of a range of such materials are reported and discussed in relation to their structure.
Spectres Raman du Monocristal de Fumarate de Potassium Dihydraté, K2H2C4O4,·2H2O
Authors: Maury Luc , Bardet Lucette , Brunel René , Vierne Raymond 
Published: May 2005

AbstractRaman spectra of a single crystal K2H2C4O4.2H2O and of polyrystalline K2H2C4O4.2H2O, K2H2C4O4.2D2O, and K2H2C4O4 have been recorded at room temperature from 10 to 3500 cm−1; Raman and infrared data are compared. The existence of hydrogen bondCH…︁O is confirmed.
Resonance Raman studies of transition metal peroxo complexes: 2‐The purple intermediate formed in the reactions of iron(II) and iron (III)ethylenediaminetetraacetate with superoxide and hydrogen peroxide, respectively
Authors: Hester R. E. , Nour E. M. 
Published: May 2005

AbstractResonance Raman spectra are reported for the purple intermediate formed in the reactions of [Fe(II)(EDTA)]2− and [Fe(III)(EDTA)]− with O2− and H2O2, respectively, using several different excitation wavelengths. The spectra show only two resonance‐enhanced bands, at 472 and 824 cm−1. The band intensity excitation profiles for these two are different, demonstrating that the resonance effects observed are associated with two different electronic transitions. The 472 cm−1 band is assigned to the ν(FeN) mode and the 824 cm−1 band to ν(OO). The structure of the species is shown to be the peroxide ion complex [Fe(III)(EDTA)(O2)]−. The O22− → Fe3+ electronic charge‐transfer transition is assigned at 454 nm.
Resonance Raman studies of transition metal peroxo complexes: 6—The peroxodicobalt(III)—oxime complexes
Authors: Hester R. E. , Nour E. M. 
Published: May 2005

AbstractResonance Raman spectra have been determined at −60°C for a series of complexes of the general form [(L)(D2H2)CoO2Co(D2H2)(L)], where D is the dianion of dimethylglyoxime and L is pyridine, (C2H5)3N, (CH3)2S, (C6H5)3P, (C6H5)3As and (C6H5)3Sb, these ligands being coordinated trans‐axially to the dioxygen. The spectra show bands in the region 810–835 cm−1 which are assigned to the ν(OO) mode and the ν(CoO) mode is assigned in the region 550–575 cm−1. The effect on the observed ν(OO) wavenumber of changing the ligand L shows how σ‐ and π‐donor effects of the ligands are transmitted through the metal. The ν(OO) band intensity excitation profile demonstrates that the O2− → Co3+ CT transition is to be assigned at 550 nm. Comparison between the nature of the cobalt‐oxygen binding in the oxime and those of the cyanide and salen systems are discussed.
Band contours of the degenerate fundamental bands of cyclohexane and cyclohexane‐d12 determination of the coriolis constants
Authors: Bien T. , Doege G. , Arndt R. 
Published: May 2005

AbstractThe Raman spectra of the degenerate bands of cyclohexane and cyclohexane‐d12 have been recorded at medium resolution in the gas phase. The computer simulation of the band contours has allowed to determine the Coriolis coupling constants ζ19, ζ20, ζ21, ζ22, ζ23, and ζ24.
Spectre Raman de Translation de la Glace Hexagonale Monocristalline: Effets Directionnels
Authors: Faure P. , Chosson A. 
Published: May 2005

AbstractIt is shown using Raman scattering experiments with appropriate geometries that the directional effects which have been observed in the spectrum of ice Ih are not of the same kind as occur in ordered piezoelectric crystals, but are caused by a modification in the activity of the one phonon density of states or of certain branches of the dispersion curves, produced by the conditions of incidence and observation.
Spectres Raman de Résonance de Dérivés Substitués de l'Aminoazobenzéne en Solution Acide
Authors: Merlin J. C. , Lorriaux J. L. , Dupaix A. , Thomas E. W. 
Published: May 2005

AbstractThe resonance Raman spectra of aminoazobenzene derivatives in acidic solution are investigated. The marked spectral changes observed on decreasing pH are related to transformations between azo and quinoid forms. The pKa value of 4‐amidino, 4′‐diméthylaminoazobenzene obtained from intensity measurements is in good agreement with the value obtained from visible absorption measurements. Comparison of resonance Raman spectra of some substituted aminoazobenzene derivatives and the quinoid form of an hydroxyazobenzene derivative enable a more complete assignment of the bands observed between 900 and 1700 cm−1 to be made. All the spectra are rather similar and the various ring substituents are not resonance Raman active. The influence of the NHN  vibration on resonance Raman spectra of the quinoid forms is demonstrated using deuterium substitution. In strong acid solution a second protonation occurs; a tautomeric equilibrium between azo and quinoid forms of aminoazobenzene derivatives is demonstrated using different exciting laser lines.
Vibrational study of the dynamic disorder in nickelocene and ferrocene crystals
Authors: Chhor K. , Lucazeau G. , Sourisseau C. 
Published: May 2005

AbstractRaman and infrared spectra (10–400 cm−1) of Ni(C5H5)2, Fe(C5H5)2 and of their perdeuterated derivatives (d10) have been recorded in the 30–300 K temperature range. A new assignment for some internal modes is proposed. The temperature dependence of the low frequency spectra (10–200 cm−1) and quasi‐elastic neutron scattering results are discussed in terms of dynamical disorder coming from molecular conformational fluctuations. The elastic incoherent structure factor (EISF) measured from neutron scattering on Ni(C5H5)2 is compatible with 2π/5 ring jumps involving an activation energy of 1.5 kcal mol−1, while Raman band broadenings are interpreted in terms of large amplitude torsional motions associated with an activation energy of about 0.5 kcal mol−1. A qualitative representation of the potential driving the torsional motion is proposed and it is pointed out that the intermolecular potential plays an important role. Finally, although the conformational fluctuations can be responsible for the pretransitional effects, they take part only for 15% of the enthalpy variations in the phase transition of Fe(C5H5)2.
Raman and infrared study on the interactions between phospholipids and proton donors
Authors: Bertoluzza A. , Bonora S. , Fini G. , Morelli M. A. 
Published: May 2005

AbstractRaman and infrared spectra of phosphatidylcholine‐acid mixtures (1:1) are reported and discussed in terms of both general structural and specific interactions as a function of the acidic strength of the proton donor. The infrared spectra indicate the formation of a strong, highly polarizable hydrogen bond with monochloro‐, dichloro‐ and trichloroacetic acids. The complete transfer of the proton from the donor to the phospholipid is observed with hydrochloric acid. The Raman data suggest conformational changes in the lateral packing of the acylic chains of the phospholipid. The importance of both these specific interactions, namely hydrogen bonding and structural modifications, in biological systems is discussed and related to biological activity.
The Raman spectrum of CF4
Authors: Lolck Jens‐Erik 
Published: May 2005

AbstractThe Raman spectrum of CF4 has been recorded from 300 to 1450 cm−1 at a spectral resolution of about 0.25 cm−1. All four fundamental bands and some overtone and hot bands have been observed. In the anisotropic fundamental bands (ν2, ν3, ν6) the basic J‐structure is partly resolved. Special attention has been paid to the ν2 and ν4 bands, as these two bands are essentially unperturbed. The analyses of ν3 and ν4 give two independent determinations of the ground state rotational constant B0 and the centrifugal distortion constant D 0 The best estimates thereof are B0 = 0.191134±0.000017 cm−1 and D0 = (4.7 ± 0.6) × 10−8 cm−1. In addition some upper state constants are determined; among these are the three band origins ν1 = 909.088 cm−1, ν2 = 435.399 cm−1, and ν4 = 631.057 cm−1, all believed to be accurate to about 0.01 cm−1. The overtone and hot bands yield information on the position of some overtone and combination states.
Continuum resonance Raman effect in halogen gases
Authors: Baierl P. , Kiefer W. 
Published: May 2005

AbstractIn a previous publication7 we have outlined a theory for continuum resonance Raman scattering in diatomics using irreducible spherical tensors. In the present paper we apply this theory to the halogen molecules 79Br2 and 127I2 and compare numerical calculations of the band profile of fundamental and overtones to experimentally obtained continuum resonance Raman spectra of these molecules.
Hydrogen bonding in dimethylsulphoxide‐proton donor interactions: A Raman and infrared study of the DMSO‐HCI system
Authors: Bertoluzza A. , Bonora S. , Fini G. , Battaglia M. A. , Monti P. 
Published: May 2005

AbstractDimethylsulphoxide (DMSO)‐hydrogen chloride interactions have been studied by means of Raman and infrared spectroscopy both in solid 1:1 adducts and in liquid mixtures with DMSO:HCl molar ratios >2. The deuterated analogue solid 1:1 (DMSO‐d6)‐DCl was also prepared and studied. Vibrational data suggest the presence of a (DMSOHOSMD)+ cation with strong (OHO)+ hydrogen bonds both in the solid adducts and in the liquid mixtures. In the solid adducts the (CIHCl)− anion may be present. A relation between some biological properties of DMSO and its protonation is suggested.
Raman and infrared spectra of pentachloroaniline
Authors: Faniran J. A. , Iweibo I. , Oderinde R. A. 
Published: May 2005

AbstractRaman spectra of crystalline pentachloroaniline (PCA) have been measured. The infrared spectra have also been recorded for solid and solutions in CCl4 between 4000–200 cm−1. An assignment of the observed frequencies has been proposed for a Cs molecular symmetry based on related halogen substituted benzene derivatives. The molecule does not appear to self‐associate in CCl4 solutions although there is some evidence for a weak hydrogen bonding in the solid state.
Raman and infrared spectra of crystalline 9‐methyladenine and its methylmercury complexes
Authors: Savoie Rodrigue , Poirier Donald , Prizant Leonardo , Beauchamp André L. 
Published: May 2005

AbstractThe Raman and infrared spectra of polycrystalline samples of 9‐methyladenine and three of its methylmercury complexes have been recorded. These complexes include the N1‐coordinated and the N1‐coordinated‐NH2‐substituted derivatives, the third compound being probably N1‐and N7‐coordinated. Spectral changes occurring upon complexation are analysed, and comparisons are made with the corresponding changes in the spectra of various adenine derivatives which are known to form complexes with CH3Hg+ in aqueous solution.
Etude des Variations d'Intensité des Polaritons en Fonction de l'Orientation du Vecteur d'Onde dans un Monocristal de Phosphite de Lithium, LiH2PO3
Authors: Beys Louis , Hillaire Paul 
Published: May 2005

AbstractUsing the relations between nonlinear optical coefficients and Raman scattering efficiencies of LO and TO phonons in LiH2PO3 single crystal, numerical values of d31 and d32 coefficients, in relative units, have been determined. The variations of the Raman scattering efficiencies have been studied with the wave vector k rotating in the xOz and the yOz planes. Theory and experiment are found to be in good agreement.
Etude des Vibrations SN et SO des Dérives de L'acide Imidodisulfurique par Spectrométrie Raman
Authors: Parent Y. , Semmoud A. , Iskander B. , Vast Et P. , Dele‐Dubois M. L. , Lorriaux‐Rubbens Et A. , Narula S. P. 
Published: May 2005

AbstractThe Raman spectra of sixteen compounds derived from HN(SO3)22− have been compared. The results show that the substitution of one or more of the oxygens of the original tetrahedron SO42− by a ligand F, Cl, NH, N, implies a contraction of the free SO bonds. This is characterized by the shifting of the symmetrical stretching frequency νs(SO). The polarizing power of the associated cations can also affect νs(SO).
Pressure and temperature dependence of the vibrational excitations of crystalline iodoform
Authors: Medina J. , Sherman W. F. , Wilkinson G. R. 
Published: May 2005

AbstractRaman spectra of single crystals of iodoform have been investigated over the temperature range 10–300 K and under hydrostatic pressure up to 14 kbar. The pressure‐induced shifts in vibrational frequency of many different modes have been used to calculate their respective Gruneisen parameters γ which are found to vary both with the frequency and pressure. They are much greater for the intermolecular modes than for the internal modes. The infrared absorption spectra have also been observed at different temperatures and are used together with the Raman data to obtain dν/dT for each band. Some new infrared assignments are suggested.
Relaxation of molecular motions in dibromomethane by Raman band shape analysis
Authors: Prakash R. , Thyagarajan G. 
Published: May 2005

AbstractMolecular vibrational and reorientational relaxation studies on CH2Br2 are presented using Raman band contours of ν3 (CBr symmetric stretch) and ν4 (BrCBr symmetric bend) bands. Fourier transforms of isotropic and anisotropic parts of the bands were employed to obtain correlation functions and correlation times. The results are compared with those reported previously and discussed in the light of the existing theories.
The vibrational spectra and structure of B6H62− and 1, 6‐C2B4H6
Authors: Bragin J. , Urevig D. S. , Diem M. 
Published: May 2005

AbstractThe infrared and Raman spectra of the cesium and tetramethylammonium salts of the hexahydro‐clovohexaborate dianion (B6H62−) are reported and the vibrational fundamentals assigned in detail. An analysis of the fundamental vibrations of this dianion and the isoelectronic carborane, 1, 6‐C2B4H6, shows the latter to have stronger BH and BB bonds.
Determination of Raman intensities of lattice vibrations in crystalline oxamide
Authors: Bleckmann P. , Thibud M. 
Published: May 2005

AbstractQuantum‐chemical methods have been used for the calculation of the intensities of Raman‐active lattice vibrations in crystalline oxamide. In a first step, the frequencies and eigenvectors of the external vibrations in oxamide are calculated by use of the concept of a flexible vibrating molecule within the intermolecular atom‐atom forces. The interactions between macroscopic electric fields and external modes are discussed. The quantum‐mechanical aspects are considered and finally, a semiempirical method is extended to cover the relative Raman intensities of the external modes.
Vibrational spectrum and conformation of cyclopropyldimethylborane
Authors: Odom J. D. , Saari S. V. , Nease A. B. , Szafran Z. , Durig J. R. 
Published: May 2005

AbstractThe infrared (3500–50 cm−1) and Raman spectra (3500‐10 cm−1) have been recorded for cyclopropyldimethylborane in both the gaseous and solid states. Additionally, the Raman spectrum of the liquid was recorded and qualitative depolarization values were obtained. Only one conformation has been found in all three physical states and, on the basis of the polarized nature of the Raman band assigned as the BC2 antisymmetric stretch, this conformer is identified as being the bisected structure with Cs molecular symmetry. A complete vibrational assignment, except for the BC2 and two methyl torsional modes, is proposed based on the depolarization data, infrared gas phase band contours, and group frequencies. These results are compared to the corresponding data for several other organoboranes.
Raman spectra of Na3AsS4·8(D, H)2O and Na3SbS4·9(D, H)2O and OD(H)…S bonds in salt hydrates
Authors: Mikenda W. , Steidl H. , Preisinger A. 
Published: May 2005

AbstractRaman spectra, measured in the temperature range T =75–295 K, are reported for H2O, D2O and isotopically dilute samples of Na3AsS4·8(D, H)2O and Na3SbS4·9(D, H)2O. At T =75 K the uncoupled OD(H) stretching frequencies are observed in the range ν = 2433–2664(3279–3618) cm−1 and ν = 2461–2528(3318–3417) cm−1 for the thioarsenate and the thioantimonate, respectively. Plausible assignments to the distinct crystallographically non‐equivalent OD(H) groups are given.The correlation between the uncoupled OD stretching frequencies and the hydrogen bond distances R(D…S) of approximately linear OD…S bonds in salt hydrates is discussed. The frequency shifts upon H‐bond formation are shown to depend strongly on the chemical nature of the sulphur proton acceptors.
A Raman study of aqueous solutions of ferric nitrate, ferrous chloride and ferric chloride in the glassy state
Authors: Kanno H. , Hiraishi J. 
Published: May 2005

AbstractRaman spectra have been obtained for aqueous solutions of Fe(NO3)3, FeCl2 and FeCl3 in the glassy state where R = moles of water/moles of salt = 10–20. The predominant jonic species in these solutions are [Fe(H2O)6]3+, [Fe(H2O)6]2+ and trans‐ [Fecl2(H2O)4]+, respectively. The second dominant ferric species in the glassy FeCl3 solution (R = 20) seems to be the [FeCl(H2O)5]2+ ion, which is inferred from comparison of the frequencies of the FeOH2 stretching Raman bands.
Etude, par Spectroscopie de Vibration Infrarouge et Raman, du Dihydrate de l'Acide Perchlorique dans les Etats Désordonnés: Verre et Liquide
Authors: Thi Mai Pham , Herzog‐Cance Marie‐Héléne , Potier Antoine , Potier Jacqueline 
Published: May 2005

AbstractThe infrared and Raman spectra of the mixture HClO4 · 2H2O in the glassy and liquid states have been investigated. Two species have been characterized:

the dioxonium perehlorate where the H5O2+ and ClO4− ions are linked by hydrogen bonds weaker than in the crystal (νOH(H5O2+) = 3430 and 3460 cm−1 respectively in the glass and liquid state Raman spectra and 3340 cm−1 for the crystal).
an ionic association, O3ClO−…H(OH)HOH2+, in which the vibrational motions of the terminal H2O molecules are characterized by δOH = 1530 and 1550 cm−1 and νOH = 3480 and 3520 cm−1 respectively in the glass and liquid state Raman spectra and in which ν1(ClO4−) shifts to lower frequencies (Δν = −12cm−1).
Raman linewidth study of rotational motion of chloroform in aqueous solution
Authors: Tanabe Kazutoshi 
Published: May 2005

AbstractIsotropic and anisotropic Raman linewidths of the CD stretching mode of chloroform‐d have been measured in water and other solvents, and rotational diffusion constants for the rocking motion of chloroform molecules around their perpendicular to the symmetry axis have been determined from linewidths. The correlation of experimental rotational diffusion constants in solutions, with fluidities of solvents, is examined, and the effect of iceberg structures formed around chloroform molecules in aqueous solution on the rotational motion of chloroform is discussed.