High resolution Raman spectra of hot bands associated with ν2 in [formula omitted

Abstract

The Raman spectra of the Q branches of the hot bands associated with the ν 2 stretching fundamental of 13 C 2 D 2 (ν 2+ν 4–ν 4, ν 2+ν 5–ν 5, ν 2+2ν 4–2ν 4, ν 2+2ν 5–2ν 5, ν 2+ν 4+ν 5–(ν 4+ν 5)) have been recorded using inverse Raman spectroscopy with an instrumental resolution of about 3×10 −3 cm −1 . A simultaneous analysis of all the assigned transitions has been performed on the basis of a theoretical model which takes into account the rotational and vibrational l-type resonances within each vibrational manifold and the Darling–Dennison anharmonic resonance between the ν 2+2 ν 4 and ν 2+2 ν 5 states. The determined parameters reproduce the assigned wavenumbers with a standard deviation of the same order of magnitude as the experimental uncertainty.