Excitation of O I and C I forbidden-line fine structure transitions by He and H2 - A neglected selection rule

Details Excitation of O I and C I forbidden-line fine structure transitions by He and H2 - A neglected selection rule Excitation of O I and C I forbidden-line fine structure transitions by He and H2 - A neglected selection rule

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.228..101m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 228, Sept. 1, 1987, p. 101-107. SERC-supported research

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49

Atomic Excitations, Carbon, Fine Structure, Forbidden Transitions, Helium, Oxygen, Computational Astrophysics, Hydrogen, Molecular Clouds

Scientific paper

There exists a selection rule forbidding (to first order) the 0-1 fine structure transition in collisions involving O(3P) or C(3P) and He or H2. Quantal close coupling calculations for O(3P) - He(1S) show this selection rule to be quantitatively significant, reducing the rate coefficient for the 0-1 transition by an order of magnitude relative to the 0-2 and 1-2 transitions. The rate coefficients for the latter two transitions are found to be similar in magnitude to those computed by Launay & Roueff for atomic hydrogen impact.

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