Vibrational absorption spectrum of solid CO in the first harmonic region. Two-phonon transition

Publication

Reference: Legay F., Legay-Sommaire N. (1982). Vibrational absorption spectrum of solid CO in the first harmonic region. Two-phonon transition. Chem. Phys., 65, 49 - 57.

Names

Title: Vibrational absorption spectrum of solid CO in the first harmonic region. Two-phonon transition
Abstract: Infrared absorption spectrum of CO crystal at low temperature, recorded in the \ensuremathΔ\ensuremathυ = 2 region, shows a strong \ensuremathΔ\ensuremathυ = 2 zero phonon line, a broad phonon side band and a small line which is attributed to the simultaneous vibrational transitions between two molecules. The absorption coefficient and line frequency of this two-phonon line is calculated by a theory taking account both the induced dipole moment between molecular couples and the Fermi resonance between the \ensuremathν = 2 level and the two-phonon level. It is shown that most of the two-phonon line intensity comes from the Fermi resonance effect. Good agreement with experiment is obtained. The linewidth is given by the convolution product of two 0 \textrightarrow 1 line shapes.
Keywords: spectroscopy, near-IR, ices, molecular solids, CO
Content: spectral data

Doi

10.1016/0301-0104(82)85054-4

Identifiers