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High-efficiency spin-resolved and spin-integrated electron detection: Parallel mounting on a hemispherical analyzer

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3 Author(s)
Ghiringhelli, G. ; ESRF–European Synchrotron Radiation Facility, BP 220, F38043 Grenoble Cedex, France ; Larsson, K. ; Brookes, N.B.

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We have mounted a compact 25 kV mini-Mott spin polarimeter on a commercial high-throughput hemispherical electron analyzer with a double purpose: to maximize the polarization detection and to preserve the original efficiency of the spectrometer in the spin-integrated measurements. We have thus replaced the 16-anode microchannel-plate detector with a 12-anode microsphere-plate detector in parallel with a Rice University retarding Mott spin polarimeter. Passing from one detection mode to the other is quick and easy. The transfer optics from the analyzer exit slit to the scattering target of the polarimeter allows the full potential of both the electron analyzer and the spin detector to be exploited. The expected effective Sherman function (Seff=0.17) and figure of merit 0≅1.4×10-4) are found in the spin-resolved mode, and only 25% of the original efficiency is lost in the spin-integrated acquisitions. © 1999 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:70 ,  Issue: 11 )

Date of Publication:

Nov 1999

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