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Astron. Astrophys. Suppl. Ser. 142, 107-112

The formation of SiH+, PH+, and SH+ by radiative association

P.C. Stancil1,2 - K. Kirby3 - J.-P. Gu4 - G. Hirsch4 - R.J. Buenker4 - and A.B. Sannigrahi5

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1 - Physics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6372, U.S.A.
2 - Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, U.S.A.
3 - Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, U.S.A.
4 - Theoretische Chemie, Bergische Universität-Gesamthochschule Wuppertal, Gaußstr. 20, D-42097 Wuppertal, Germany
5 - Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India

Received July 19; accepted November 23, 1999


Cross sections for the radiative association of Si+, P+, and S+ with atomic hydrogen to form the diatomic molecular ions SiH+, PH+, and SH+, respectively, are presented. The results are obtained using fully quantum-mechanical techniques and utilize ab initio molecular data calculated with the multireference single- and double-excitation configuration-interaction (MRD-CI) method. Thermal rate coefficients are presented and applications of the results to diffuse interstellar clouds are discussed.

Key words: molecular processes -- ISM: molecules

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