Kwan, John and Scoville, Nick (1974) Radiative trapping and population inversions of the SiO masers. Astrophysical Journal, 194 . L97-L101. ISSN 0004-637X. doi:10.1086/181678. https://resolver.caltech.edu/CaltechAUTHORS:20190403-153008551
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Abstract
Radiative trapping in the v = 0 → 1 vibrational transitions decreases the rate of de-excitation of a v = 1 level as its rotational quantum number increases. This effect readily leads to population inversions of the v = 1 rotational transitions if population is transferred from v = 0 into v = 1 by collisions or by an indirect radiative route, as, for example, through absorptions from v = 0 into v = 2 and the subsequent spontaneous cascade from v = 2 to v = 1. Numerical calculations which model the SiO masers discovered toward stars give photon emission rates in the J = 1 → 0, J = 2 → 1, and J = 3 → 2 transitions which are comparable and substantial, 3 x 10^(43) s^(-1).
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| Additional Information: | © 1974. The American Astronomical Society. Received 1974 August 14; revised 1974 September 18. This research is sponsored by the National Science Foundation grant GP-40768X (J.K.) and GP-30400-X5 (N.S.) and by the Office of Naval Research under contract N0014-67-A-0094-0019 (N.S.). We thank Drs. P. Goldreich and P. Solomon for very helpful discussions. We also thank Dr. Roger Thompson for informing us that the CO V = 0 → 1 lines have Einstein B coefficients of absorption that are comparable to those of SiO V = 0 → 1 lines. | |||||||||
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| Subject Keywords: | masers — radiative transfer | |||||||||
| DOI: | 10.1086/181678 | |||||||||
| Record Number: | CaltechAUTHORS:20190403-153008551 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190403-153008551 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 94431 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 11 Apr 2019 20:07 | |||||||||
| Last Modified: | 16 Nov 2021 17:05 |
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