HIGH RESOLUTION INFRARED SPECTRA OF $^{13}C-METHANOL$ IN THE OH-STRETCH REGION

Abstract

High-resolution infrared spectra of the $^{13}C-methanol \nu_{1}$ band have been obtained by slit-jet absorption spectroscopy. A total of 1278 lines have been recorded from 3665 to $3708 cm^{-1}$ with several ``holes'' resulting from strong water absorption lines. Thirty five subbands of the $\nu_{1}$ band with $K = 0, 1, 2$ have been assigned based on polynomial fits and ground-state combination differences. Half of the upper states are split by perturbations with matrix elements in the range of $1-3 cm^{-1}$. The deperturbed data show an approximately regular pattern of torsional energies with a torsional tunnelling splitting of $7 cm^{-1}$ at $K = 0$.