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NEGATIVE ION PHOTOELECTRON SPECTROSCOPY OF $NH_{2}^{-}(NH_{3})_{1}$ AND $NH_{2}^{-}(NH_{3})_{2}$
James V. Coe, Joseph T. Snodgrass, Kevin M. McHugh, Carl B. Freidhoff, Kit H. Bowen
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Abstract
The negative ion photoelectron spectra of the cluster ions, $NH^{-}_{2}(NH_{3})_{1}$ and $NH^{-}_{2}(NH_{3})_{2}$, have been obtained. The negative cluster ions were produced by placing a biased filament on the high vacuum side of a nozzle expansion of $NH_{3}$. The transitions corresponding to that appearing in the photodetachment spectrum of $NH^{-}_{2}$ are stabilized by 0.518 eV and 0.996 eV in the spectra of $NH^{-}_{2}(NH_{3})_{1}$ and $NH^{-}_{2}(NH_{3})_{2}$, respectively. Just as in $H^{-}(NH_{3})_{1}$, a second peak at lower electron kinetic energy is observed in the spectrum of $NH^{-}_{2}(NH_{3})_{1}$, and this is related to the asymetric stretch of ammonia. Implications of the fact that $NH_{2}(NH_{3})_{1}$ has a greater electron affinity than $H(NH_{3})_{1}$, even though $NH_{2}$ and H have almost the same electron affinities, will be explored.