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Electron exchange; ion exchange; vertex function; collisional ionisation; photo-effect charge transfer

Feynman diagram method of treating atomic collision problems in perturbation theory is presented and matrix elements are calculated for a number of processes. The result for the resonant charge transfer in hydrogen is identical to the well known OBK value. However, in processes like collisional ionisation, the results are different from those obtained by conventional methods.

T Pradhan^{1 2} Avinash Khare¹

1. Institute of Physics, Bhubaneswar - 751007
2. Saha Institute of Nuclear Physics, Calcutta - 700009

Published

May 1976

Manuscript received

1 December 1975

Manuscript revised

5 January 1976