摘要:

AbstractAn experimental and theoretical study of the vibrational Raman intensities of propane in the gas phase is presented. The absolute scattering coefficients and depolarization ratios corresponding to clearly separated spectral zones (made up of one or more vibrational modes) have been measured. The absolute scattering coefficients and depolarization ratios for each normal vibrational mode have been determined theoretically using the hypothesis that bond polarizabilities are transferable. Ethane parameters from previous work and the vibrational eigenvectors deduced from a propane force field given in the literature were used to apply this hypothesis.

ISSN:0377-0486    

DOI:10.1002/jrs.1250160302

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY

摘要:

AbstractLes spectres IR et Raman de 1,3,5‐triamino‐2,4,6‐trinitrobenzène ont été mesurés sur toute la gamme spectrale (10 à 4000 cm−1). Une analyse par coordonnées normales utilisant un champ de force Urey‐Bradley modifié et tenant compte des redondances cycliques permet l'attribution. Les seuls modes purs sont: la torsion CNO2à 101 cm−1, la torsion CNH2à 606 cm−1, la déformation angulaire hors du plan NH2à 1030 cm−1, la déformation angulaire dans le plan NH2à 1212 cm−1et les deux déformations de

ISSN:0377-0486    

DOI:10.1002/jrs.1250160303

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY

摘要:

AbstractRaman spectra of MnTiF6·6H2O, MnTiF6·6D2O, ZnTiF6·6H2O and ZnTiF6·6D2O single crystals were studied in different polarizations between 300 and 77 K and the observed bands were assigned to the various modes of vibrations of these systems. Phase transition in these systems was observed by studying the intensity of νs(TiF6) mode and νs(H2O/D2O) mode with temperature. The mechanism of the phase transition is disc

ISSN:0377-0486    

DOI:10.1002/jrs.1250160304

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY

摘要:

AbstractEnhancement factor calculations based on the electromagnetic model of surface‐enhanced Raman scattering (SERS) are presented for a series of metals. The specific dependence of SERS on the excitation and vibrational frequencies, and the aspectratio of spheroidal particles, are discussed. It is suggested that the results are relevant for experiments carried out on metal‐island surfa

ISSN:0377-0486    

DOI:10.1002/jrs.1250160305

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY

摘要:

AbstractThe isotropic Raman spectrum of12CD4is presented in the range from 2101 to 2113 cm−1, thus covering the ν1(A1)Q‐branch and part of the ν2+ ν4(F1+F2)Q‐branch. Experimental results for the 2101‐2108 cm−1range were obtained using the ‘inverse Raman spectroscopy’ technique and have been published previously. New measurements in the 2108 cm−1‐2113 cm−1range were obtained using the very similar ‘stimulated Raman gain spectroscopy’ technique. In both spectra the resolution is limited by the Doppler width of the lines. Formally, only transitions to the upper state of the ν1band are allowed in isotropic Raman scattering, but strong resonances enhance transitions to the upper state of ν2+ ν4. An effective Hamiltonian which takes these resonances into account was used to interpret the spectra and led to the assignment of all significant lines. In all, 165 Raman transitions were assigned, and these transitions are fitted by the model Hamiltonian with a sta

ISSN:0377-0486    

DOI:10.1002/jrs.1250160306

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY

摘要:

AbstractComparison of Raman spectra of octahedral Ru(pyridine)6(BF4)2with those of Ru(bipyridine)(pyridine)4(ClO4)2provides an opportunity to analyse the orientation of Ru(pyridine)6at silver over a wide potential range. At the more positive potentials, the Ru(pyridine)6appears to be bonded through two pyridine ligands, while at more negative potentials, the orientation is probablyC4ν, indicating bonding through one pyridine. Previously reported potential dependences of Raman scattering intensities show mobility of the complex on the electrode surface and probable conversion between these two orientations. Possibilities for further orientation changes at more positive and more negative potentials are obscured by electrode oxidation and complex desorption, respectively

ISSN:0377-0486    

DOI:10.1002/jrs.1250160307

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY

摘要:

AbstractResonance enhancement of the NO stretching Raman bands has been observed from dilute solutions (10−3‐10−2mol dm−3) of some alkyl nitroxyl radicals by excitation into their ultraviolet absorption band (λmax≈︁ 240 nm). Excitation at 248 nm was produced by a line‐narrowed, pulsed KrF excimer laser. Three overtone bands, which were observed for di‐tert‐butylnitroxyl, showed a small anharmonic contribut

ISSN:0377-0486    

DOI:10.1002/jrs.1250160308

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY

摘要:

AbstractThe gas‐phase Fourier transform infrared spectrum (4000‐400 cm−1) of chlorocyclopropane was recorded at a resolution of 0.5 cm−1. For the first time, gas‐phase Raman and solid‐phase infrared and Raman spectra were obtained for this molecule. Liquid‐phase Raman and infrared spectra were also recorded and, on the basis of all the data, a complete assignment of the 21 normal modes of vibration of chlorocyclopropane was made. The proposed assignment is in excellent agreement with assignments for other substituted cyclopropanes and, in particular, other chlorine‐substitute

ISSN:0377-0486    

DOI:10.1002/jrs.1250160309

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY

摘要:

AbstractFar infrared and Raman spectra of solid CH3F and CD3F have been recorded at 80 and 20 K. The lattice spectra of CD3F and the lattice Raman spectrum of CH3F are reported for the first time. Additional peaks have also been observed in the far infrared spectrum of solid CH3F. New splittings for the internal mode fundamentals for ν3, ν5and ν6are reported for both compounds, and also for ν2(CH3F) and ν4(CD3F). An assignment of the observed bands is proposed. The crystal structure has not been determined directly, but the spectroscopic evidence suggests that it is centrosymmetric with at least eight molecules in the primitive unit

ISSN:0377-0486    

DOI:10.1002/jrs.1250160310

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY

摘要:

AbstractThe Raman spectrum of gaseous phosphaethyne (HCP) has been recorded, and the CH and CP stretching vibrations (ν1and ν3) have been observed at 3218 and 1277 cm−1, respectively. These frequencies compare very favorably with those previously determined from IR and UV‐visible spectra. The sample is stable for short periods of time under the required experimental conditions, and the vibrational data are discussed in terms of the stability and reactivi

ISSN:0377-0486    

DOI:10.1002/jrs.1250160311

出版商:John Wiley&Sons, Ltd.    

年代:1985

数据来源: WILEY