Dynamically Induced Spin Polarization of Resonant Auger Electrons

Abstract

Resonant Auger electrons from the decay of the atomic Xe 4d 21 5͞2 6p͑J 1͒ state excited with linearly polarized light are shown to have a strong spin polarization. The core hole states are not oriented in this case. We found polarization values ranging from 20.46 to 0.57. For the decay to the 5p 4 ͑ 1 D 2 ͒6p͑ 2 P 1͞2 ͒ state the ratio of the radiationless decay matrix elements and their relative phase, including its sign, are derived. [S0031-9007(99)09447-8]

Resonant Auger decay ofXe*4d5∕2−1O’Keeffe1, Aloïse2, Fritzsche3 et al. 2004Phys. Rev. A102120View full textAdd to dashboardCite

“…These results can be provided by analysis of the degree of linear and circular polarization of the fluorescence ␥ FL induced by linearly and circularly polarized radiation ␥ SR , respectively. It should be noted that the resonant Auger decay investigated here differs from previous complete experiments on the Auger decay [22][23][24][38][39][40] in that the polarization of the residual ion state needs to be accessed in a different manner, namely by the fluorescence, because this is the only relaxation pathway for the excited ionic states. The fluores-cence decay channel of the residual ion has been used already for complete characterization of the resonant photoionization of subvalence atomic shells in Ca and Sr [41,42].…”

“…The main showcase subjects for the complete experiments have been the photoionization and Auger decay of rare-gas atoms. A wide range of experimental techniques have been used to gain information about these processes including highresolution electron spectroscopy [5][6][7][8][9][10][11][12][13][14][15], fluorescence measurements on the residual ion [16,17], spin-polarization measurements on the emitted electrons [18][19][20][21][22][23][24][25][26], and measurement of their angular distribution [14,[27][28][29][30][31]. Significant progress has been made due to advances associated with the development of third generation synchrotron radiation sources and spin-polarization detection techniques.…”

Spin-resolved FeL3M2,3M2,3

“…9͒ that can be observed especially in the resonance case. 10 The necessary condition is that at least two decay channels with comparable amplitudes exist like in the photoelectron emission where we have the mixing between the l c Ϯ1 channels. If one channel dominates in the Auger decay, the contribution from dynamical effects to the SP of the Auger electrons is small.…”

Determining the polarization state of an extreme ultraviolet free-electron laser beam using atomic circular dichroism

“…Accordingly, CD in photoemission from solids has been widely used for the investigation of local magnetization and other properties of solids and surfaces (for example, refs 10,11). In atomic and molecular physics, circularly polarized photon beams have been applied for example in studies of electron spin-related phenomena and its polarization control 12,13 as well as of symmetry breaking in chiral molecules 14,15 . With FERMI many experimental techniques, already well established for applications of CD using synchrotron radiation, high order harmonics or optical lasers [16][17][18][19][20][21] , can now be extended to studies at FEL sources.…”