Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apjs..101..237c&link_type=abstract
Astrophysical Journal Supplement v.101, p.237
Astronomy and Astrophysics
Astronomy
13
Molecular Data, Line: Identification
Scientific paper
High-resolution Fourier transform infrared spectra of SiO were recorded from two sources, the umbral region of a sunspot and a high-temperature laboratory cell. Rovibrational transitions in the sunspot absorption spectrum were measured in consecutive vibrational bands from (1, 0) to (13, 12) with J values as high as 141 for 28Si 16O (1258 lines) and (1, 0) to (6, 5) for 29Si 16O and 30Si 16 O(455lines). In the lower temperature laboratory emission spectrum only 387 rotational lines in the (1, 0) to (5, 4) bands were measured exclusively for 28Si 16O. The laboratory spectrum served primarily to calibrate the lines in the sunspot spectrum to absolute rest frequencies. An improved set of Dunham constants for the 1Σ+ ground state was obtained from a global fit of a combined data set consisting of our IR data and all the previously reported microwave and millimeter-wave data. In addition an internuclear potential for the 1Σ+ ground state, in the form of a parameterized modified-Morse function, was also obtained by fitting the data directly to the eigenvalues of the radial Schrödinger equation.
Bernath Peter F.
Campbell John M.
Dulick Michael
Klapstein D.
Wallace Laura
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