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A 19-state R-matrix investigation of resonances in e - -He scattering. I. The resonance widths and positions

1989; IOP Publishing; Volume: 22; Issue: 23 Linguagem: Inglês

10.1088/0953-4075/22/23/016

1361-6455

W C Fon, K A Berrington, P G Burke, A E Kingston,

Quantum, superfluid, helium dynamics

The authors use the results of a 19-state R-matrix calculation to search for resonances in e--He scattering with positions lying below n<or=4 states of helium. The resonance positions and widths are calculated. The excitation function of the metastable states (23S+21S) of helium is also calculated and the resonance structures are examined and compared directly with the previous measurements of Brunt et al (1977) and Buckman et al (1983). The classification of resonances by Brunt et al and the designation of 'Wannier ridge' resonances by Buckman et al and by Buckman and Newman (1987) are re-examined in the light of the present 19-state R-matrix calculation.