Further observations of vectorial effects in the x-ray photoemission from caesium iodide

George W. Fraser; John Ernest Lees; James F. Pearson

doi:10.1117/12.23213

1 February 1991 Further observations of vectorial effects in the x-ray photoemission from caesium iodide

George W. Fraser, John Ernest Lees, James F. Pearson

Proceedings Volume 1343, X-Ray/EUV Optics for Astronomy, Microscopy, Polarimetry, and Projection Lithography; (1991) https://doi.org/10.1117/12.23213
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

We present further data on the linear polarisation sensitivity of CsI X-ray/UV photocathodes. A radical physical origin- "non local" photoemission- is proposed for the X-ray vectorial effect. Predictions from a uniaxial photocathode model are compared with measurements of (i) relative pulse quantum yields, relative current quantum yields and electron number distributions for both s- (electric vector perpendicular to the plane of incidence) and p- ( parallel to the plane of incidence) polarised soft X-rays in the wavelength range 4.6-125A and (ii) relative current quanm yields from illumination by partially-polarised, broad-band UV radiation with a modal wavelength of 1550A. 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 (i) an understanding of soft X-ray Interactions with materials and (ii) the design and sensitivity of the Spectrum X-Gamma Photoemission Polarimeter is discussed ; our future plans for the investigation of photocathode physics are finally outlined.

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George W. Fraser, John Ernest Lees, and James F. Pearson "Further observations of vectorial effects in the x-ray photoemission from caesium iodide", Proc. SPIE 1343, X-Ray/EUV Optics for Astronomy, Microscopy, Polarimetry, and Projection Lithography, (1 February 1991); https://doi.org/10.1117/12.23213

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