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Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 22: Electron scattering and recombination I

A 22.2: Talk

Thursday, March 17, 2011, 14:30–14:45, BAR 106

Spin dynamics of electrons in strong fields studied via bremsstrahlung from a polarized electron beam — •Stanislav Tashenov1,2,3, Torbjörn Bäck1, Roman Barday4, Bo Cederwall1, Joachim Enders4, Anton Khaplanov1, Yuliya Poltoratska4, Kai-Uwe Schässburger1, and Andrey Surzhykov3,51Royal Institute of Technology, Stockholm, Sweden — 2Stockholm University, Sweden — 3Physikalisches Institut der Universität Heidelberg, Germany — 4Institut für Kernphysik, Technische Universität Darmstadt, Germany — 5GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

Linear polarization of the photons emitted in the process of the atomic field electron bremsstrahlung has been studied at the newly developed 100 keV polarized electron source of TU Darmstadt. A correlation between the initial orientation of the electron spin and the degree and the angle of photon linear polarization has been measured for the first time. For this purpose a hard x-ray Compton polarimeter consisting of a segmented high purity germanium detector and an external passive photon scattering target have been applied. Linear polarization sensitive Compton and Rayleigh photon scattering distributions have been sampled by the segmented detector. The observed polarization correlation reveals a precession of the electron spin as it moves in the field of the nucleus. The full-relativistic calculations for the case of radiative recombination into a Rydberg series limit have been corroborated by the measurement. The results of this experiment suggest a new method for electron beam polarimetry.

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