Developments in Molecular Photoelectron Spectroscopy (I) and Studies by Far Infrared and Raman Spectroscopy of Intermolecular Vibrations in Solids and Liquids (II)

摘要

Molecular photoelectron spectroscopy: The basic theory governing the appearance of photoelectron spectra is developed and the main factors upon which the intensities of the bands depend are summarized. The instrumentation is briefly described and the photoelectron spectra of many classes of molecules are reported and analysed in terms of their orbital structure. These include the hydrides MH, MH2, Mh3, and MH4; multiple bonded diatomics N2, NO, O2 and F2; ethane, methyl silane and disilane. Jahn-Teller splitting is found in many cases and a new type of autoionization process has been discovered. High energy photons from He(+), 304A. (40.8eV) have been used for the first time. Infra-red and raman spectra of solids and liquids: This report reviews results obtained in this laboratory on the phonon spectra of a wide range of crystal types using polarised infra red and laser Raman spectroscopy. A general account is given of the theory of lattice vibrations in simple crystals and of the fundamentals of infra-red and Raman spectroscopy of solids. The range of compounds investigated is extensive enough to provide a review of typical vibrational spectra for most of the principal crystal classes. The symmetries for the optic external k = O vibrational modes are given for each crystal type and are discussed together with the infra-red and Raman spectra. (Author)