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The Anomalous Vectorial Photoemission from a Cesium‐Antimony Layer
Author(s) -
Hora H.,
Kantlehner R.
Publication year - 1966
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19660170108
Subject(s) - physics , isotropy , anisotropy , excitation , plane of incidence , atomic physics , electron , perpendicular , photon , polarization (electrochemistry) , optics , condensed matter physics , chemistry , plane wave , geometry , quantum mechanics , mathematics
The photoemission from a transparent cesium‐antimony layer is measured. A special arrangement of the cell allows a 75° angle of incidence of the light, so that the reflected and transmitted intensities can be determined simultaneously. With an E ‐vector perpendicular or parallel to the plane of incidence, the absolute quantum yields Q are measured as functions of the absorbed light. In this way it is possible, apparently for the first time, to determine the absolute ratios of polarization yield K abs = Q ⊥/ Q ∥ for large angles of incidence. With glass‐side illumination the vector effect is anomalous (as in previous results), having maximum K abs values of 1.7 in the region of phonon energies of 2.2 eV. By contrast, the K abs values are within 10% of unity with vacuum‐side illumination. Besides the virtual absence of the vector effect, there is a small systematic variation around unity. This shows that the electron excitation process is almost isotropic in the direction opposite but parallel to the motion of the photons. Only in the forward direction can anisotropy with a preferred direction perpendicular to the E ‐vector be deduced. This is analogous to the Compton effect and may be explained as a predominance of indirect transitions. The ratio of the probability of indirect to direct transitions is estimated, and from this the band structure beyond the minima may be determined.