A global treatment of reported microwave, millimeter-wave, and Fourier-transform far-infrared (FIR) spectra of the C-13 isotopic species of methanol has been carried out for the first two torsional states ( n t Å 0 below the barrier and n t Å 1 straddling the barrier) of the ground vibrational state. 42-57 (1984)). A convergent global fit was achieved using 55 adjustable and 2 fixed parameters to reach an overall weighted standard deviation of 0.962, giving further confirmation that a traditional onedimensional internal rotation model can accurately describe methanol energy levels up through the first excited torsional state. Our new parameters for C-13 methanol are compared to previous global fitting results for the normal 12 CH 3 OH isotopomer. Calculations employing these parameters reveal possible C-13 assignments for 28 lines appearing in natural abundance in a newly measured methanol microwave atlas from 7 to 200 GHz compiled by the group at Toyama University in Japan.
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