Resonance Raman spectra and excitation profiles of tetradesmethyl‐β‐Carotene

Abstract

AbstractResonance Raman spectra of tetradesmethyl‐β‐carotene were recorded using nine laser lines in the visible region. In a KBr disk at 77 K, two strong fundamental bands (1523 and 1133 cm−1) and their overtone and combination bands were observed to the fifth overtone region. Excitation profiles of nine Raman bands, including overtone and combination bands, were measured in isopentane solutions at 185 K. These were simulated by a simple two‐dimensional model based on Albrecht's A‐term, and a reliable set of parameters corresponding to the structure differences between the excited and ground electronic states was determined. The agreement between the observed and calculated excitation profiles was excellent, showing the adequacy of the model adopted.