Abstract
The importance of coupling for fast collisions between protons and hydrogen atoms is examined with the two-centred expansion in atomic eigenfunctions proposed by Bates (1958
a
). Cross-sections are evaluated for reactions H
+
+ H (I
s
) → H(I
s
) + H
+
, H
+
+ H( I
s
) → H(2
s
) + H
+
, and H
+
+ H(l
a
) → H
+
+ H(2
s
). The effect of a single intermediate state, either I
s
or 2
s
, is considered. For the non-resonance processes, it is found that the cross-sections may be substantially increased by passage through intermediate state for incident energies less than about 10 keV, tending towards equality with decrease in relative velocity. Results obtained for the symmetrical resonance reactions are in good agreement with the two-state solutions of McCarroll (1961).
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