Raman excitation profiles of trans‐ azobenzene in the 361 to 494 nm wavelength range by means of a pulsed dye laser source

Several Raman excitation profiles of trans‐ azobenzene in carbon tetrachloride have been obtained in the wavelength range 361–494 nm. By using 21 different exciting wavelengths from a tunable pulsed dye laser the eight most intense Ramanlines occurring in the 1000–1600 cm−1 shift range were investigated and the effective absorption wavelengths λeff were located. The results indicate that in the investigated range of exciting wavelengths a few molecular states corresponding to vibrational structures of the π*←π absorption band at 319 nm contribute predominantly to the Raman scattering from all analysed vibrational modes.