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Published June 1992 | public
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Low-energy electron scattering by methane, arsine and phosphine

Winstead, Carl
Sun, Qiyan
McKoy, Vincent
Luiz da Silva Lino, Jorge
Lima, Marco A. P.
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Abstract

We present cross sections for the elastic scattering of low-energy electrons by phosphine (PH_3) and arsine (AsH_3), and for electron-impact excitation of the (1t_2 → 3sa_1)^3T_2 and ^1T_2 states in methane (CH_4). These results were calculated using the Schwinger multichannel method as implemented on distributed-memory parallel computers. The PH_3 and AsH_3 cross sections show a pronounced low-energy shape resonance which may provide a pathway to dissociative attachment. The ^(1,3)T_2 cross sections for CH_4 correlate fairly well with recent measurements of CH_2 production via electron-impact dissociation of methane.

Additional Information

© 1992 Springer. Received: 5 March 1992. Final version: 13 April 1992. We thank the staff of the CCSF, particularly Heidi Lorenz-Wirzba and Edith Huang, for technical assistance, and acknowledge financial support by the National Science Foundation under Grant No. PHY-9021933. Calculations reported here made use of computer facilities operated by the CCSF for the Concurrent Supercomputing Consortium. We are grateful to one of the referees for drawing our attention to [12].

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