Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..36..291j&link_type=abstract
Astrophysics and Space Science, vol. 36, Sept. 1975, p. 291-301.
Astronomy and Astrophysics
Astrophysics
2
Carbon Monoxide, Deuterium, Hydrogen Clouds, Interstellar Gas, Molecular Excitation, Molecular Rotation, Abundance, Electron Decay Rate, Electron Transitions, Graphs (Charts), Ground State, Molecular Collisions, Ultraviolet Radiation
Scientific paper
Populations of the rotational levels of vibrational and electronic ground state of inter- stellar HID and CO have been calculated. Ultraviolet pumping and molecular formation have been found to be very important in the case of HID but not so in CO, the population distribution of which is mainly governed either by 3 K or by collisional excitation. The population inversion has been found to occur in HD but not in CO, the excitation temperatures of which pass through maximum for large ultraviolet flux. The population inversion at large density does not occur in HD, probably due to neglect of multipole collision. The observation of HD and CO in the excited states may be possible for suitable values of density and ultraviolet flux
Joshi Pankaj
Tarafdar Shankar P.
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