Abstract

During experiments on the diffraction of slow electrons (0-180 ev) at normal incidence, a diffracted beam was observed corresponding to the direction of specular reflection; i.e., straight back along the incident direction. This beam had properties indicating that it should not be considered as a limiting case of beams diffracted at other colatitude angles. Maxima in reflected intensity of this beam were observed at 4, 16, and 31 ev incident energy. The target used was a single crystal of tungsten with the (110) face exposed. Ultra-high-vacuum techniques were employed.

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