Signature of Ericson Fluctuations in helium inelastic scattering cross sections near the double ionization threshold

Junliang Xu, Anh Thu Le, Chii-Dong Lin
James R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS, USA

Toru Morishita
University of Electro-Communications, Tokyo, Japan

We calculated the inelastic electron impact excitation cross sections of He⁺ by electrons for a model helium atom to examine the onset of the signature of quantum chaotic scattering in this simple system. We find Ericson fluctuations (EF) in the calculated inelastic scattering cross sections only when the impact energies lie within about 0.25 eV below the double ionization threshold. We also discuss the stringent requirements and the proper methods for analyzing the inelastic scattering cross sections in order to observe EF experimentally.

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, and by the National Science Foundation.

Presented at DAMOP, May 2008, in State College, PA.

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