We have recorded high-resolution polarized and depolarized Raman spectra of isotopically pure 35Cl2 using the argon ion laser lines 501.7, 496.5, 488.0, 476.5, 457.9, 363.8, 351.1, and 333.6 nm and the krypton ion laser line 413.1 nm. Overtone progressions can be observed for 413.1 nm and UV excitation. The spectral band shapes of the overtones show a systematic variation with excitation frequency. The relative intensities of the overtone bands have been calculated with second order perturbation theory. The spectral feature of the overtones can be explained by resonance Raman scattering via the repulsive 1Π1u state. The 1Π1u potential was determined with a high accuracy. This is possible because the Raman band intensities are very sensitive to the location of the potential curves of the involved excited scattering states. The spectral feature of the fundamental band excited in the UV region can be explained assuming a destructive interference effect between resonant and nonresonant Raman scattering resulting from adjacent highly lying states. This effect can be monitored via the depolarization ratio of the fundamental transitions, the change in relative intensities between the different Q branches of the fundamental bands and comparison of the observed and calculated overall band intensities of the fundamental and overtone bands excited with different laser lines.
.We have recorded high-resolution polarized and depolarized resonance Raman spectra of molecular iodine with excitation by argon-ion laser lines at 496.5, 488.0, and 476.5 nm up to the seventh, and with 457.9 nm up to the fifth, overtone. These spectra were also calculated numerically applying second-order perturbation theory. In contrast to earlier publications on this subject, special emphasis was put on obtaining highly reliable polarized and depolarized spectra. The variations of the spectral band shapes and depolarization ratios obtained at different excitation wavelengths could be explained by means of the specific contributions of the two excited electronic states 3no+, and Inlu. About 60 different experimentally obtained spectra were finally used to derive the positions of the two excited-state potentials involved in this type of light scattering. The derivation was done by comparison of the experimental and theoretically simulated spectra where parameters of the In,, as well as of the 3no+u state potentials were varied.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.