Abstract
Fluorescence spectra of the Ã-X̃ system from parent ions produced by electron impact on N 2O, CO 2 and CS 2 in supersonic jets have been measured in the 30–300 eV range to study the details of rotational excitation. The rotational state distributions of the product ions are essentially Boltzmann and the effective rotational temperatures increase with decreasing impact energy to the threshold. The net increase in the rotational energy from 300 to 30 eV is 0.9 meV for N 2O +(Ã), 0.9 meV for CO + 2(Ã) and 1.7 meV for CS + 2(Ã). This trend of rotational excitation is mainly ascribed to angular momentum transfer through the quadrupole interaction between the scattered and ejected electrons and the produced ion.
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