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Measurements of photoelectric yield and electron energy distribution have been made on natural crystals of lead sulfide, Peruvian galena, in spherical photocells at pressures of 10 - 8 mmHg. Under these conditions maximum yields are found to be of the order of 1% in contrast to the much higher yields previously reported for this material. Yield data for cesium-coated samples are also presented, as are values of the optical absorption coefficient in the range 4-12 eV. Observed effects are interpreted as indicating the existence of an additional valence band whose maximum is located approximately 4 eV below the top of the higher bands. Such an assignment is found to be in qualitative agreement with the computed band structure.
Physical Review – American Physical Society (APS)
Published: Dec 1, 1963
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