Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Electron-impact helium double excitation within the S-wave model

Plottke, C., Nicol, P., Bray, I., Fursa, D.V. and Stelbovics, A.T. (2004) Electron-impact helium double excitation within the S-wave model. Journal of Physics B: Atomic, Molecular and Optical Physics, 37 (18). pp. 3711-3721.

Link to Published Version: http://dx.doi.org/10.1088/0953-4075/37/18/011
*Subscription may be required

Abstract

The Laguerre-based convergent close coupling method is used to calculate the electron-impact excitation cross sections of the auto-ionizing states 2s2s1S, 2s3s1S and 2s3s3S, various ionization, as well as other cross sections for scattering from the 11S, 2 1S and 23S initial states of helium. The calculations are done within the S-wave model. Unlike the case of bound-state excitation, convergence studies need to take into account occasional mixing between the core manifolds which can severely affect the structure of the auto-ionizing states and those corresponding to ionization with excitation. A method to take this into account is given and it is shown that convergent results may be obtained, Comparison with the 'Z = 2' time-dependent calculations of Pindzola et al (1999 Phys. Rev. A 59 4390-8) is satisfactory.

Item Type: Journal Article
Murdoch Affiliation: Centre for Atomic, Molecular and Surface Physics
Publisher: Institute of Physics
URI: http://researchrepository.murdoch.edu.au/id/eprint/32841
Item Control Page Item Control Page