Abstract
New millimeter-wave and microwave measurements for CH3OD have been combined with previous literature data and with an extended body of Fourier transform far-infrared observations in a full global analysis of the first two torsional states (vt = 0 and 1) of the ground vibrational state. The fitted CH3OD data set contained 564 microwave and millimeter-wave lines and 4664 far-infrared lines, representing the most recent available information in the quantum number ranges J ≤ 20 and K ≤ 15. A 53-parameter converged global fit was achieved with an overall weighted standard deviation of 1.060, essentially to within the assigned measurement uncertainties of ±100 kHz for almost all of the microwave and millimeter-wave lines and ±6 MHz for the far-infrared lines. The new parameters for CH3OD are compared to previous results obtained for the 12CH3OH, 13CH3OH, and CD3OH isotopomers over the same quantum number ranges using the identical fitting program. Strong asymmetry-induced coupling between the accidentally near-degenerate 0E and −1Evt = 0 substates is successfully modeled by the fit.
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