Abstract
Nonadiabatic transitions of two types: (1) between discrete states and (2) between discrete and continuous spectrum states were considered for the detachment of a negative hydrogen ion in collisions with a hydrogen molecule. It was shown for the example of collinear collisions that, at low collision energies, the mechanism of the process was related to the quasi-stationary character of the ground electronic state of the quasi-molecule, whereas the mechanism related to the quasi-stationary character of the first excited state became noticeable as the energy of collisions increased.
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