Collisions of Cs- with atoms and molecules

Presents the results for measurements of the absolute total cross sections for electron detachment sigma e(E) and charge transfer sigma i(E) in low-energy collisions of Cs- with He, Ne, Ar, Kr, Xe, D2, N2, O2, CO, CO2, SO2, N2O, CH4 and SF6. In the case of the rare gases, the apparent energetic threshold for detachment is rather high (near E=50 eV); a similar observation has also been made for the Na- and K- projectiles. As before, a curve-crossing model well describes the observed sigma e(E). Structure in sigma e(E) for the CO2 target has been attributed to charge transfer to a metastable state of CO2-(2A1). Similarly, in the case of N2O, both sigma e(E) and sigma i(E) exhibit behaviour which suggests that charge transfer to a temporary negative-ion state of that molecule is involved in the collisional dynamics. Charge transfer is also observed to be an important exit channel for other molecules; for example, the value of sigma i(E=30 eV) is about 500 a02 for the SF6 target.

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