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Experimental and theoretical study of electron impact excitation of the 3 3P state of helium

Lookup NU author(s): Dr Danica Cvejanovic, Emeritus Professor Albert Crowe

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Abstract

Excitation of the 3 3p state of helium has been studied experimentally and theoretically using the convergent close-coupling (CCC) and R-matrix with pseudo-states (RMPS) methods. The results of a polarization correlation experiment at 40 eV are accurately predicted by both theoretical methods. The CCC values of the integral polarization also agree well with experiment when the influence of cascading states is accounted for in the calculations. We conclude that the CCC/RMPS calculations provide the most reliable excitation cross sections available over a wide range of incident electron energies. A comparison is also made between experimental and RMPS cross sections and polarizations in the resonance region, 55-60 eV. This model represents the first attempt to explicitly include physical doubly excited states of neutral helium in a close-coupling calculation.

Publication metadata

Author(s): Cvejanovic D; Crowe A; Igual-Ruiz N; Donnelly BP; McLaughlin DT; Fursa D; Bartschat K; Bray I

Publication type: Article

Publication status: Published

Journal: Journal of Physics B: Atomic, Molecular and Optical Physics

Year: 2001

Volume: 34

Issue: 11

Pages: 2289-2300

ISSN (print): 0953-4075

ISSN (electronic): 1361-6455

Publisher: Institute of Physics Publishing Ltd.

URL: http://dx.doi.org/10.1088/0953-4075/34/11/320

DOI: 10.1088/0953-4075/34/11/320

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