Abstract

Bound-free vacuum uv emissions from rare-gas alkali ionic excimers were observed by relativistic electron beam pumping of gas mixtures of Xe or Kr with hot cesium vapor. The observed two diffuse emission bands centered at 159 and 131 nm are assigned to be the 2 1Σ+→1 1Σ+ transition of (XeCs)+ and (KrCs)+ ionic excimers, respectively.

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