Complex Fano asymmetry parameters for helium L = 0, 1, 2 autoionizing levels excited by electron impact

Theoretical Fano q-parameters for He autoionizing states excited by electron impact are presented, as extracted from first- and second-order hybrid distorted-wave Born + R-matrix calculations. It is found that the q-parameters for (2s2)1S, (2p2)1D, and (2s2p)1P from the first-order calculations are...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2009-11, Vol.42 (22), p.225201-225201 (7)
Main Authors: Martin, N L S, deHarak, B A, Bartschat, K
Format: Article
Language:English
Subjects:
Atomic and molecular collision processes and interactions
Atomic and molecular physics
Atomic excitation and ionization by electron impact
Electron scattering
Exact sciences and technology
Physics
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Summary:Theoretical Fano q-parameters for He autoionizing states excited by electron impact are presented, as extracted from first- and second-order hybrid distorted-wave Born + R-matrix calculations. It is found that the q-parameters for (2s2)1S, (2p2)1D, and (2s2p)1P from the first-order calculations are essentially real quantities, while those from the second-order calculations are complex but with a real part similar to the first-order values. These findings are interpreted in terms of the relative phases of the first- and second-order amplitudes.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/42/22/225201