ISSN:
1572-9559
Keywords:
far-infrared
;
FT spectroscopy
;
methanol
;
torsion
;
CH3 18OH
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract High-resolution Fourier transform spectra have been recorded from 15–470 cm−1 for the far-infrared trosion-rotation band of O-18 methanol in the vibrational ground state. So far, 57 subbands have been assigned in the 15–220 cm−1 region for a wide range of rotational and torsional states, and their J-independent origins have been determined to an estimated accuracy of ±0.01 cm−1. The observed origins were found to deviate in many cases by several tenths of a cm−1 from the values calculated with the previous molecular parameters. Together with 4 known microwave origins, the new data have been fitted to a model torsion-rotation Hamiltonian in order to refine the set ofb-type molecular constants for the ground state. With the new parameter set, the experimental subband origins are reproduced with an rms error of ±0.02 cm−1, representing a substantial improvement over the earlier situation. The spectroscopic results have also been of great assistance with our assignments of optically-pumped FIR laser emission in CH3 18OH, in providing FIR data for checking the identification of the IR-pump/FIR-laser transition systems through combination loop relations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02096274
Permalink
