Investigation of Raman excitation profiles for cis-(CH)x and -(CD)x polymers

✍ Scribed by Gia G. Maisuradze; Graham A. Bowmaker; Ralph P. Cooney

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 290 KB
• Volume: 30
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/(sici)1097-4555(199901)30:1<53::aid-jrs345>3.0.co;2-8

✦ Synopsis

A quantitative analysis of the Raman excitation proÐles (REPs) for and observed by Lichtmann cis-(CH)

x -(CD) x et al. was undertaken on the basis of improved vibronic interaction theory. The e †ect of inhomogeneous broadening of REPs of a molecule due to di †erences in chain length was examined. The need for mathematically correct allowance for the simultaneous inÑuence of the homogeneous and inhomogeneous mechanisms of broadening on the vibronic components both of the REPs and the absorption spectra and also for the interference (non-diagonal) terms of the scattering matrix is discussed. The values of the equilibrium coordinate shifts for the Raman-active mode, the homogeneous and inhomogeneous broadening parameters derived from the study of the proÐles of the fundamentals and the Ðrst overtones and binary combinations are compared with theoretical results of previous studies of and and b-carotene.