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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.

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

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