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Near-threshold correlation studies of the 2 1P and 3 3D states of helium excited by electron impact

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

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Abstract

Excitation of the 3 3D state of helium by electrons with an energy of 370 meV above threshold is studied experimentally using the electron-photon polarization correlation method and theoretically using the convergent close-coupling (CCC) and R-matrix with pseudo-states (RMPS) methods. Stokes parameters and associated coherence parameters are presented. Despite difficulties associated with a sharp resonance in the cross section at this energy, generally good agreement is obtained between experiment and the calculations. At small scattering angles the results show a violation of the propensity rule for angular momentum transfer. CCC and RMPS calculations have also been performed at 22 and 24 eV for the 2 1P state and are compared with earlier angular correlation data.

Publication metadata

Author(s): Crowe A, Cvejanovic D, McLaughlin DT, Donnelly BP, Fursa D, Bray I, Bartschat K

Publication type: Article

Publication status: Published

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

Year: 2000

Volume: 33

Issue: 13

Pages: 2571-2578

Print publication date: 14/07/2000

ISSN (print): 0953-4075

ISSN (electronic): 1361-6455

Publisher: Institute of Physics Publishing Ltd.

URL: http://dx.doi.org/10.1088/0953-4075/33/13/316

DOI: 10.1088/0953-4075/33/13/316

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