Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991opten..30.1177f&link_type=abstract
Optical Engineering (ISSN 0091-3286), vol. 30, Aug. 1991, p. 1177-1190. Research supported by British National Space Centre.
Astronomy and Astrophysics
Astronomy
3
Cesium Iodides, Photocathodes, Photoelectric Emission, Quantum Efficiency, X Ray Astronomy, Aluminum Oxides, Phase Shift
Scientific paper
Further data are presented on the linear polarization sensitivity of CsI X-ray/UV photocathodes. A radical physical origin, nonlocal photoemission, is proposed for the X-ray vectorial effect. Predictions from a uniaxial photocathode model are compared with measurements of (1) relative pulse quantum yields, relative current quantum yields, and electron number distributions and (2) relative current quantum yields from illumination by partially polarized broadband UV radiation with a modal wavelength of 1550 A. An origin seated in the polarimeter geometry is also proposed for the off-axis 'phase shift' phenomenon reported in previous papers. The impact of these measurements on an understanding of soft X-ray interactions with materials and the design and sensitivity of the Spectrum-X-Gamma photoemission polarimeter is discussed.
Fraser George W.
Lees John E.
Pearson J. Jr. F.
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