FOURIER TRANSFORM INVESTIGATION AND "RITZ" ANALYSIS OF THE TORSION-ROTATION FAR-INFRARED SPECTRUM OF O-18 METHANOL.
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Date
1995
Journal Title
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Volume Title
Publisher
Ohio State University
Abstract
This is a fundamental study of the torsion-rotation energy level manifold of the ground vibrational state of $CH_{3}^{18}OH$. The spectra, ranging from $15 - 470 cm^{-1}$ with a resolution of $0.002 cm^{-1}$, have been recorded at the Herzberg Institute of Astrophysics of the National Research Council in Ottawa and the Physical Chemistry Institute of Justus-Liebig-Universitat, Giessen. Both the "Ritz" global fitting program and spreadsheet tables for individual subbands have been used in this study. More than 7,000 lines and 1,800 levels of A torsional symmetry, and 10,000 lines and 2,500 levels of E symmetry have so far been assigned and evaluated. As well, interactons involving $\Delta K = 1$, $\Delta K = 2$ and $\Delta K = 4$ perturbations have been observed and analyzed. This study is helpful in providing a comprehensive data set with which to test models for the theoretical analysis of asymmetric top molecules with internal rotation. It has also been very useful in supplying solid ground-state combination differences required for the investigation of excited vibrational states, and the ground-state links needed to form closed combination loops in the assignment of optically-pumped FIR laser emission.
Description
Author Institution: University of New Brunswick, Fredericton, N. B., Canada E3B 5A3; Università di Pisa, Piazza Torricelli 2, I-56126 Pisa, Italy; Memorial University of Newfoundland, St. John's, Nfld., Canada AIB 3X7; Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany; N.R.C., Ottawa, Ont., Canada KlA 0R6