Abstract
The energy of electrons released in ionization of di- and triatomic molecules by He (2 1S, 2 3S), Ne and Ar ( 3P 0, 2) metastable atoms was measured. Attention was concentrated on the determination of peak shifts and peak form in order to elucidate new features of the mechanism of ionization with respect to ionization of atoms. In ionization by He (2 1S) atoms, asymmetric peak forms and greater shifts towards lower electron energy were found than in ionization by He (2 3S) atoms. A tentative explanation for peak shifts in terms of orientation of molecules during the collision and of molecular orbitals involved in ionization was proposed. Effects due to J values of metastable atoms and molecular ions were described. The ionization of electronegative molecules (NO 2) probably takes place already at large particle separation because of mixing with the X +ABC − ionic state which, on recombination, ionizes into X + ABC + + e.
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