Low-energy electron-impact excitation of the ã^3 B_(1u) (π→π∗) state of ethylene

Creators: Sun, Qiyan; Winstead, Carl; McKoy, Vincent; Lima, Marco A. P.

Abstract

A two‐state close‐coupling calculation of electron‐impact excitation of ethylene to the ã ^3B_(1u) state (π→π*) is carried out using a version of the Schwinger multichannel method developed for distributed‐memory parallel computers. The calculated integral cross section shows a sharp rise at threshold, in agreement with available experimental data. The integral and differential cross sections are useful in understanding the mechanism of this excitation process and indicate the possible presence of a core‐excited shape resonance near threshold.

Additional Information

© 1992 American Institute of Physics. (Received 26 August 1991; accepted 18 November 1991) We thank Heidi Lorenz-Wirzba of the Caltech Concurrent Supercomputing Facility (CCSF) for technical assistance and Hong-Qiang Ding for assistance with aspects of the programming. Parallel computing resources were provided by the CCSF and the Concurrent Supercomputing Consortium. Portions of these calculations employed the facilities of the JPL/Caltech Supercomputing Project. Support by the Applied Mathematical Sciences Program of the Department of Energy, the Strategic Defense Initiative Organization through the Army Research Office, the National Science Foundation (Grant Nos. PHY-8901515, INT-8714948, and INT-9106425), and the Air Force Office of Scientific Research (Grant No. AFOSR-89-0132) is gratefully acknowledged.

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