Abstract
The translational energy dependence of the relative cross section for production of negative ions by collisions of fast cesium atoms with maleic anhydride (C4H2O3) and succinic anhydride (C4H4O3) has been studied from threshold up to approximately 20 eV (c.m.). Accurate measurements of the threshold energy for the creation of Cs+ and C4H2O3− from collisions of cesium atoms with maleic anhydride yield the electron affinity of maleic anhydride to be 1.4±0.2 eV. A number of fragment negative ions are observed from both compounds and the results are compared with our recently reported electron impact studies. CO2−* ions are observed to be unstable with respect to autodetachment, and the autodetachment lifetimes are measured to be 62±10 and 71±10 μsec for CO2−* from maleic and succinic anhydride, respectively. In both cases the lifetime of CO2−* is independent of the collision energy from threshold up to 15 eV.
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