Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368l..19m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. L19-L22.
Astronomy and Astrophysics
Astronomy
12
Interstellar Matter, Microwave Spectra, Millimeter Waves, Radio Astronomy, Rotational Spectra, Silicon Oxides, Vibrational Spectra, Carbon Lasers, H Ii Regions, Molecular Excitation, Supernovae
Scientific paper
The millimeter-wave rotational spectra of SiO in high vibrational states (v = 0-40) in its electronic ground state were measured between 228 and 347 GHz in a laboratory discharge through SiH4 and CO. On ascending the vibrational ladder, populations decline precipitously for the first few levels, with a vibrational temperature of about 1000 K; at v of roughly 3, however, they markedly flatten out, and from there to v of roughly 40 the temperature is of the order of 10,000 K. With the Dunham coefficients determined here, the rotational spectrum of highly vibrationally excited SiO can now be calculated into the far-infrared to accuracies required for radioastronomy. Possible astronomical sources of highly vibrationally excited SiO are certain stellar atmospheres, ultracompact H II regions, very young supernova ejecta, and dense interstellar shocks.
Gottlieb Carl A.
Mollaaghababa Reza
Thaddeus Patrick
Vrtilek Jan M.
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