Calculation of resonant effects in electron-impact excitation of positive ions Application to oxygen VII

Details Calculation of resonant effects in electron-impact excitation of positive ions Application to oxygen VII Calculation of resonant effects in electron-impact excitation of positive ions Application to oxygen VII

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phrva..19...72p&link_type=abstract

Physical Review A - General Physics, 3rd Series, vol. 19, Jan. 1979, p. 72-80.

Physics

General Physics

15

Atomic Excitations, Electron Impact, Ion Temperature, Oxygen, Resonance Scattering, Cations, Collision Parameters, Scattering Cross Sections

Scientific paper

The general reaction theory of Feshbach is applied to the calculation of resonant effects in near-threshold electron-positive-ion excitation. The theory divides configuration space into open- and closed-channel parts, resonance effects being described by the closed-channel part. The open-channel part is handled in a distorted-wave approximation to the set of open-channel coupled equations. Various methods are suggested for handling the closed-channel part. However, an 'attached-excited-target approximation' is used explicitly, which is further approximated by a set of uncoupled closed-channel equations. As an example, the 1 1S-2 1P excitation cross section of O VII below the 3 3S threshold is calculated. Various distorted-wave approximations are investigated and results from most of them are quite similar. Resonant effects arising from the attachment of the colliding electron with the 3 3S state are found to be small, but other close-lying n = 3 states have not yet been included.

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