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Sub-Doppler Infrared Spectra of the OH–Stretch Fundamental of 13C-Methanol

✍ Scribed by Andrei Chirokolava; David S. Perry; Li-Hong Xu

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
241 KB
Volume
203
Category
Article
ISSN
0022-2852

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✦ Synopsis

High-resolution infrared spectra of the 13 C-methanol OH stretching band, 1 , were obtained by slit-jet absorption spectroscopy at a rotational temperature of 12-15 K. Twenty-eight subbands were assigned within the range of upper state quantum numbers, KЈ ϭ 0 to 2 and JЈ ϭ 0 to 10. The upper state energy levels are heavily perturbed; about half of the assigned subbands were found to be split by perturbations with matrix elements in the range 1-3 cm Ϫ1 . The doubled lines were deperturbed and together with the "unperturbed" lines were fitted to a global torsion-rotation Hamiltonian with root-mean-square deviation of 0.41 cm Ϫ1 to yield a torsional barrier height of ϳ405 cm Ϫ1 in the vibrationally excited state.

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