Photoemission Studies of the Alkali Metals. II. Rubidium and Cesium

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Abstract
The photoelectric yield and photoelectron energy distributions have been measured on Rb and Cs in the photon energy range 2. 0-11. 2 eV. These results and the trends across the series Na, K, Rb, Cs are compared with the predictions of the three-step volume model. The energy distributions show evidence of scattering by pair creation and surface-plasmon creation in close similarity to characteristic energy-loss spectra. Estimates for the hot-electron mean free path in Cs are quite short, indicating that surface properties are likely to be important in some energy ranges.