TY - JOUR
T1 - Complex Fano asymmetry parameters for helium L = 0, 1, 2 autoionizing levels excited by electron impact
AU - Martin, N. L.S.
AU - Deharak, B. A.
AU - Bartschat, K.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
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U2 - 10.1088/0953-4075/42/22/225201
DO - 10.1088/0953-4075/42/22/225201
M3 - Article
AN - SCOPUS:70450170459
SN - 0953-4075
VL - 42
JO - Journal of Physics B: Atomic, Molecular and Optical Physics
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
IS - 22
M1 - 225201
ER -