The Photoemission of Tungsten in the Region of Predicted Schottky Deviations

Experimental evidence for the existence of deviations from the photoelectric Schottky line theoretically predicted by Guth-Mullin has been obtained. In the phase of the periodic deviations an averaging of data yields for example a maximum at 219±18 (v/${\mathrm{c}\mathrm{m})}^{\mathrm{½}}$ and a minimum at 278±16, in agreement with theoretical values of 215 and 285, respectively. The amplitudes of the deviations are 0.3-1.5 the predicted values with smaller than theoretical values predominating.