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Dissociative self-surface ionization of alkali-metal halides

1983; Elsevier BV; Volume: 47; Linguagem: Inglês

10.1016/0020-7381(83)87186-1

1873-3034

Hiroyuki Kawano, Tsutomu Kenpō, Hiroshi Koga, Yoshiaki Hidaka, Masao Suga,

Advanced Chemical Physics Studies

The emission rates (no and n±) of neutral alkali halide molecules (MXo) and of thermal positive or negative ions (M+ or X−) produced on the self surface of polycrystalline alkali halide (roughly 103 molecular layers) on a platinum plate (2.0 mm2) were measured simultaneously as a function of surface temperature (about 700–800 K). Quantitative relations between n±/√no and nine factors governing the rates were theoretically derived, and both effective work function and fractional surface area for emitting M+ or X− were determined, thereby indicating that M+, X−, and MXo were emitted from different surface sites with quite different values in work function.