Assignments and Predictions of Optically Pumped Far-Infrared Laser Lines in [13C] Methanol and Associated High-Resolution Spectra

✍ Scribed by I. Mukhopadhyay

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 507 KB
• Volume: 166
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1176

✦ Synopsis

In this work, the high-resolution infrared (IR) spectrum of ({ }^{13} \mathrm{C})-substituted methyl alcohol corresponding to the (\mathrm{C}-\mathrm{O}) stretch vibration and the far-infrared (FIR) spectrum corresponding to the torsional-rotational transitions have been recorded using a Fourier transform spectrometer. The results of detailed analyses of the spectra have been applied to propose new assignments of FIR laser lines pumped by the (9 P(34) \mathrm{CO}{2}) laser line. These assignments involve highly perturbed levels in the first excited (\mathrm{C}-\mathrm{O}) stretch vibrational state. The assignments are supported by closed combination loops of accurately measured IR and FIR transitions. The analysis also yielded accurate frequencies for 17 potential FIR laser lines in (\left[{ }^{13} \mathrm{C}\right]) methanol. The spectral data relevant to this work are presented. The FIR absorption spectroscopic study allowed us to evaluate the leading torsional-rotational molecular parameters for ({ }^{13} \mathrm{CH}{3} \mathrm{OH}) in the vibrational ground state. The results of the high-resolution study will be useful for a precise model of the Hamiltonian for the excited C-O stretching state. 1994 Academic Press, inc.