Theoretical and Experimental Investigation of Photoemission in the Region of Periodic Schottky Deviations

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Abstract
The existence of deviation from the photoelectric Schottky line has been investigated for metals theoretically, and the experimental evidence for this deviation has been obtained for tungsten and molybdenum. A theoretical equation is derived based on a modified model which contains a classical image force and exchange and correlation forces. The theoretical solution indicates that the amplitude is inversely proportional to the frequency of the light source, whereas the phase or the period is found to be independent of the frequency of the light source. The experiments involved measuring the photoelectric emission current of tungsten and molybdenum as a function of electric field. Results were obtained for two different frequencies of light source for each sample. The periodic deviation from the Schottky line was observed clearly from a number of runs. A comparison of the experimental results with the theoretical prediction has been made. The agreement in the amplitude and the phase between them is very good.