Abstract
The laboratory frame rotational close coupling approximation has been employed to calculate electronic excitation of H2 (X 1 Sigma + g to B 1 Sigma + u) by positron impact. Two electronic states (X 1 Sigma g+ and B 1 Sigma u+) and three rotational states in both channels are retained in the calculations. The electronically elastic, excitation and rotational cross sections in the energy range 15 to 75 eV have been reported. The coupling effect reduces the electronically elastic results. Present laboratory frame results are compared with body frame results of Mukherjee et al (1991). Above an incident energy of 25 eV the present electronic excitation results differ significantly from those of Mukherjee et al.
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