摘要:

AbstractThe absolute Raman intensities as well as the depolarization ratios of the vibrational modes ν1, ν2, ν4and 2ν4of cyanogen in the gas phase are reported. These data are interpreted on the basis of the bond polarizability theory. From this interpretation it seems reasonable to assign localized CN bond polarizabilities to the cyanogen mol

ISSN:0377-0486    

DOI:10.1002/jrs.1250070302

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY

摘要:

AbstractAntisymmetric light scattering of molecules with a non‐degenerate ground electronic state is discussed. Scattering of this type appears for a rotating molecule, but only when account is taken of (a) the dispersion of the polarizability and (b) the Coriolis force acting on the electrons. An expression is derived for the antisymmetric components of the scattering tensor α ikant, which relates them to the tensor of the Faraday effect for a molecule with fixed nuclei and to the frequency derivative of the polarizability tensor, ∂\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm{\hat \alpha }} $\end{document}/∂ω. Generally, the sum of both contributions yields αant∼ Ω ∂α/∂ω, where Ω is the angular velocity of rotation of the molecule. The possibilities of experimental observation of the predicted e

ISSN:0377-0486    

DOI:10.1002/jrs.1250070303

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY

摘要:

AbstractThe Raman spectra of 220 carbonyl‐containing compounds have been recorded. The characteristic frequencies are reported. Correlations between frequencies and structure have been investigated. The collected data have been incorporated into a formerly developed and outlined interpretation system for CH, OH and O compounds. Difficulties in modifying the old system are discussed and a schematic survey of the new system is give

ISSN:0377-0486    

DOI:10.1002/jrs.1250070304

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY

摘要:

AbstractLow temperature infrared and Raman spectra of polycrystalline BaBr2·2H2O at different degrees of deuteration are studied in the frequency range from 4000 to 30 cm−1. The single peaks observed for the bending fundamentals of isotopically dilute H2O and D2O show that the molecules of the water of crystallization are equivalent, as required by Bang's structure determination. The singlets observed for the three fundamentals of isotopically dilute HDO show that there is a symmetric force field in the water molecules which is not predicted from the structure determination. In BaBr2·2H2O weak hydrogen bonds to the bromine ions are present which are largely bent. From the shift of the stretching modes relative to the frequencies of free water the hydrogen bond enthalpy was found to be 20 kJ. The temperature shifts of all the stretching modes are positive, which is not in agreement with Falk's results on bent hydrogen bridges. The internal modes and the twisting libration of the water molecules show an unusual large correlation splitting due to intermolecular coupling of the vibrations of the two water molecules in the 2Br−·2H2O structur

ISSN:0377-0486    

DOI:10.1002/jrs.1250070305

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY

摘要:

AbstractThe Raman spectra of single crystals of NaPF6·H2O are reported. By transferring the Raman tensors for theOhpoint group to the NaPF6·H2O crystal, the relative intensities of the PF 6−modes are calculated and a good agreement is obtained between the calculated and observed values. The Raman tensors for the internal modes of the water molecules in NaPF6·H2O are obtained and it is shown why the totally symmetric bending mode of these molecules is not observed in the Raman effect. The ratio of ∂α/∂S1values for the PF 6−and H2O groups in this study corresponds to the one calculated from a delta pot

ISSN:0377-0486    

DOI:10.1002/jrs.1250070306

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY

摘要:

AbstractThe Raman spectra of the platinum complex [Pt(NH3)4]Cl2and [Pt(ND3)4]Cl2in the solid state and in aqueous solution and of [Pt(NH3)4]Cl2·H2O in the solid state have been obtained and discussed. All the ligand vibrations in the deformation and rocking regions have been studied and some show interesting changes on hydration. The polarization data and high quality spectra obtained in this study allow a more complete assignment of the vibrational modes of the complex

ISSN:0377-0486    

DOI:10.1002/jrs.1250070307

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY

摘要:

AbstractThe Raman spectra of bicyclopropyl and vinylcyclopropane were studied in the solid, liquid and vapor phases in an attempt to identify their rotational isomers and to measure their enthalpy differences. For bicyclopropyl, the presence of thes‐transandgaucheisomers in the liquid and vapor phases has been confirmed. The present measurements show that thegaucheisomer is more stable in both the vapor and liquid, by 91±28 cal mol−1in the vapor and by 188±10 cal mol−1in the liquid. For vinylcyclopropane, features due to only two conformers could be identified in the liquid and vapor spectra. In the vapor the predominant isomer, previously identified as thes‐transrotamer,9was found to be more stable by 1.1±0.1

ISSN:0377-0486    

DOI:10.1002/jrs.1250070308

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY

摘要:

AbstractThe pure rotational Raman spectrum of sulphur trioxide in the vapour phase at 333K has been obtained and analysed for the first time. The following rotational constants and bond length were determined:\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} B_{\rm 0} {\rm = 0}.348\,57 \pm {\rm 0}{\rm .000\,03 cm}^{ - 1} \\ 10^{\rm 7} D_J {\rm = 2}{\rm .68} \pm {\rm 0}{\rm .07 cm}^{ - 1} \\ r_{\rm 0} {\rm = 141}{\rm .98} \pm {\rm 0}{\rm .02 pm} \\ \end{array} $$\end{document}Thisr0value agrees to within the sum of one standard deviation of the experimental errors with the value obtained from an analysis of the vibration–rotational infrared spectrum of the 2ν3ba

ISSN:0377-0486    

DOI:10.1002/jrs.1250070309

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY

摘要:

AbstractThe pure rotational Raman spectrum of selenium trioxide monomer in the vapour phase at 410 K has been obtained and analysed for the first time. The following rotational constants and bond lengths were obtained:\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} B_{\rm 0} {\rm = 0}{\rm .246\,60} \pm {\rm 0}{\rm .000\,05 cm}^{ - 1} \\ 10^{\rm 8} D_J {\rm = 3}{\rm .9} \pm {\rm 0}{\rm .04 cm}^{ - 1} \\ r_{\rm 0} {\rm = 168}{\rm .78} \pm {\rm 0}{\rm .02 pm} \\ \end{array} $$\end{document}This is the first spectroscopic determination ofr0in SeO3. The precision ofr0is significantly greater than the value ofra= 169±1 pm obtained from an earlier electron diffraction study

ISSN:0377-0486    

DOI:10.1002/jrs.1250070310

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY

摘要:

AbstractThe absolute Raman intensities of methanol, ethanol and water in the gas and liquid phases have been measured using 514.5 and 337.1 nm excitation. Large intensity changes were observed for the Raman lines of the OH stretching vibrations in changing from gas to liquid. The observed intensity changes are interpreted as due to the additional contribution of the charge transfer electronic excited state arising from hydrogen bond formation. The Raman intensities of methanol, ethanol and water in alkali halide solutions were also studied. The observed effects of halide ions on the intensities and their excitation wavelength dependences were found to be well correlated with the known charge transfer states resulting from electron transfer from the halide ion to the surrounding solvent molecules.

ISSN:0377-0486    

DOI:10.1002/jrs.1250070311

出版商:John Wiley&Sons, Ltd.    

年代:1978

数据来源: WILEY