Abstract
Aluminum sheets were scratched with steel needles of different diameters, and photostimulated exoelectron emission (PSEE) therefrom was studied. It was found that the PSEE change with time after scratching can be classified into five types, which differ in the number of intensity peaks, in tm (the time required to reach the first peak), and in the mode of decay. Experiments showed that these five types were correlated with the type of scratching as well as with the surrounding gas pressure. The pressure dependence of tm is explained in terms of the “two process model” previously proposed by the suthors.
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