Theoretical Calculation of Photoemission Yield Spectrum of Space Metal Materials

摘要

In the theoretical calculation of the photoemission yield spectrum of space metal materials, the mathematical model is found based upon three steps process of photoemission combined with the metal free-electron gas model. We take Cu as an example, the variation of photoemission yield spectrum caused by the electric field with different field strength and different incidence angle is calculated. This paper shows that the regions of quantum efficiency of Cu and Au when the materials are in the vacuum, under certain conditions, are respectively calculated between 8×10^–8 and 2.6×10^–3, 8.53×10^–6 and 3.8 × 10^–3, corresponding to the regions of incident ultraviolet wavelength are respectively between 138nm and 287nm,108nm and 249nm. Its quantum efficiency decreases with the increase of incident wavelength. The greater the intensity of the applied electric field, which is perpendicular to the copper surface, the greater the value of the calculated copper yield spectrum. The greater the angle formed by the incident ultraviolet light with the copper surface, the smaller the value of the calculated copper yield spectrum.