FTIR spectroscopy and FIR laser assignments for 13CD3OH

Li-Hong Xu

doi:10.1117/12.2297844

1 October 1991 FTIR spectroscopy and FIR laser assignments for ¹³CD₃OH

Li-Hong Xu

Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15763N (1991) https://doi.org/10.1117/12.2297844
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland

Abstract

The various isotopic species of methyl alcohol have proved in recent years to be fertile sources of optically-pumped far-infrared (FIR) laser lines. The relatively exotic ¹³CD₃OH form, in particular, turned out to produce the second most efficient FIR line known,¹ creating considerable spectroscopic interest. We have examined spectra of this molecule previously ,^2-4 and determined some of the molecular constants for the ground, C-O stretch and CD₃-rock vibrational states, as well as possible assignments for a few IR-pump/FIR-laser transition systems. Spectroscopic and FIR laser studies have also been carried out by Pereira and co-workers,^5,6 and many additional FIR laser lines have been found. Because several of the known FIR lines are pumped by CO₂ laser lines of the 9R branch lying above the C-O stretch band, we have extended our spectroscopic investigations into the higher IR regions to identify new vibrational bands which might account for the FIR laser emission. Further motivation came from the apparent large increase in torsional barrier height found for the CD₃-rock state, which prompted our curiosity about the barrier heights for other vibrational modes. In this paper, we discuss our progress to date in the study of new IR spectral regions of ¹³CD₃OH, and the determination of molecular constants and FIR laser assignments.

Citation Download Citation

Li-Hong Xu "FTIR spectroscopy and FIR laser assignments for ¹³CD₃OH", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15763N (1 October 1991); https://doi.org/10.1117/12.2297844

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