Friday, July 7, 2006, 11:00 am — Seminar Room, Bldg. 725
Ultrafast compact classical electron spin detector based on Mott scattering will be discussed. The bulk size of the polarimeters is 25x15cm. Polarimeter is most effective to date. The design of the polarimeter goes back to the classical 100 kV Mott detector. In this Mott polarimeter an electrostatic acceleration voltage up to 40 kV can be applied. The electron detectors are energy sensitive photomultipliers with scintillators. The detectors and amplifiers are floated on the top of the acceleration voltage and allow field-free travel of the electrons from the scattering gold foil to the detectors. Such features reduce the polarimeters sensitivity to slight motion or changes in the shape of the incoming beam. The maximal counting rate is 2 Mcounts/second. Experimental results of separate magnetic contributions of Fe and Ni in FeNi[SUB]3[/SUB] sample and Fe[SUP]2+[/SUP] and Fe[SUP]3+[/SUP] in Fe[SUB]3[/SUB]O[SUB]4[/SUB] sample studied by Spin Polarized Auger Electron Spectroscopy will be discussed.
Hosted by: Elio Vescovo
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