Surface and Volume Photoelectric Emission from Barium

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Abstract
Spectral sensitivity measurements between 5000 and 2300A have been made on barium surfaces prepared by fractional distillation in a gettered vacuum. The resulting yields are compared with those predicted by Mitchell's square-top barrier theory which is here modified to a form that facilitates comparison with experimental data. From 5000 to 3000A relative values of the observed yields are in good agreement with the modified theory. At 2967A there is an abrupt rise in the experimental curve which continues to the limit of the measurements. This is attributed to the onset of the volume photoelectric effect. The theoretical threshold for the volume effect calculated from the rough formulae of Tamm and Schubin agrees well with the experimental value.

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