Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pnas..10312263m&link_type=abstract
Proceedings of the National Academy of Science, vol. 103, Issue 33, p.12263-12268
Astronomy and Astrophysics
Astronomy
9
Scientific paper
By Fourier transform microwave spectroscopy, lambda-doubling transitions of 12CH and 13CH in the lowest rotational levels of the X21/2 ground state have been directly detected, which has not been done previously. For both radicals, hyperfine-split lines have been measured to an accuracy of better than 1 ppm between 3 and 15 GHz, an improvement of at least 2 orders of magnitude over previous laboratory data. The measured frequencies have been combined with all previous data for CH and 13CH in the v = 0 level of the X2∏ electronic state to determine improved hyperfine parameters. The production of CH from various gases also has been studied and, with methanol, the yield of CH relative to OH. Astronomical studies of CH in higher rotational levels and 13CH can now be undertaken on the basis of the present work.
microwave spectroscopy | molecular data | radio astronomy
Brown Jonathan M.
McCarthy Mary C.
Mohamed Saidi
Thaddeus Patrick
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