Abstract
Rydberg atoms are known to charge exchange with CS 2 resulting in formation of CS 2 − ions that undergo rapid electric-field-induced detachment in applied fields ⪆1 kV cm −1 . Here we examine a possible explanation for these observations based on the formation of ions in which the electron is weakly bound by the quadrupole moment ( Q 20 = + 3.3 au) of the neutral molecule. Theoretical calculations and further analysis of available experimental data suggest that such a mechanism might indeed account for the earlier observations. This is further supported to the observation that charge exchange does not occur in Rydberg atom collisions with COS ( Q 20 = −0.2 au).
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