抄録
Spectral distributions of the photoelectric yield and energy distributions of the photoelectrons were observed at room temperature, 195°K and 90°K for Cs3Sb. The facts obtained are as follows: (1) The quantum efficiency Y rises rapidly as hν increases above 2ev, and reaches the maximum at hν∼3.8ev, where the magnitude of Y exceeds 10−1. Further, there appears the second maximum at hν∼5ev. (2) For hν\gtrsim3ev Y increases with the decrease in temperature in accordance with the relation (∂Y⁄∂T)⁄Y\fallingdotseq−10−3/deg. (3) On the contrary, in the low energy tails at hν∼2ev Y decreases with decreasing temperature, or the photoelectric work function \varphi shifts with temperature in the form ∂\varphi⁄∂T=−3∼5×10−4ev/deg. (4) At lower temperatures a minor hump in Y can be seen at hν∼2.2ev. (5) Energy distributions are comparatively temperature-insensitive, but for hν∼5ev, corresponding to the second maximum in Y, there is a growing preponderance of low velocity electrons, which is quite unlike those for smaller hν.
These results are discussed in terms of a possible energy structure for Cs3Sb.
