Photoelectric Emission and Energy Structure of Cs₃Sb

Abstract

Spectral distributions of the photoelectric yield and energy distributions of the photoelectrons were observed at room temperature, 195°K and 90°K for Cs 3 Sb. The facts obtained are as follows: (1) The quantum efficiency Y rises rapidly as h ν increases above 2ev, and reaches the maximum at h ν∼3.8ev, where the magnitude of Y exceeds 10 -1 . Further, there appears the second maximum at h ν∼5ev. (2) For \(h\nu{\gtrsim}3\)ev Y increases with the decrease in temperature in accordance with the relation \((\partial{Y}/\partial{T})/Y{\fallingdotseq}-10^{-3}\)/deg. (3) On the contrary, in the low energy tails at h ν∼-2ev Y decreases with decreasing temperature, or the photoelectric work function ϕ shifts with temperature in the form ∂ϕ/∂ T =-3∼5×10 -4 ev/deg. (4) At lower temperatures a minor hump in Ycan be seen at h ν∼2.2ev. (5) Energy distributions are comparatively temperature-insensitive, but for h ν∼5ev, corresponding to the second maximum in Y , there is a growing preponderance of low velocity electrons, which is quite unlike those for smaller h ν. These results are discussed in terms of a possible energy structure for Cs 3 Sb.