Abstract

Experimental studies have been made on the secondary electron emission yields from metal surfaces bombarded by H10, H1+, and H20 with energies ranging by 10 to 40 KeV. The yields increase with the incident beam energy. The yield from H10 is smaller than that by H1+ and is proportional to the cosecant of the incidence angle. The yield by H20 is larger by a factor of two than that by H10 with the same velocity. The mechanism of the secondary electron emission is discussed by comparing the yield by H10 with that by H1+ and by considering the observed angular dependence. The observed difference in the yields by H10 and H1+ is considered to originate essentially from the difference between the ionization cross-sections of the two particles within the shallow layer below the surface. A neutral particle detector has been made on the basis of the angular dependence results.

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