Towards a Complete Experiment for Auger Decay

Resonant Auger decay ofXe*4d5∕2−1O’Keeffe1, Aloïse2, Fritzsche3 et al. 2004Phys. Rev. ASelf Cite102120View 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 Kr M4,5N1N2,31P1Auger decay: measurement of the transferred spin polarization and analysis of Auger amplitudes

“…Figure 6 shows the angular distribution of the spin polarization components P x and P z for the two Auger transitions Kr M 4 N 1 N 2,3 1 P 1 and Kr M 5 N 1 N 2,3 1 P 1 at hν = 140 eV. Using the angular distribution parameters α 2 which were experimentally determined by Kämmerling et al [16] and the proportionality factor determined in section 4.2, fitting of the expressions ( 9) and (11) to the data delivers values for the intrinsic parameters δ 1 and ξ 1 . The result of the fitting procedure is plotted in figure 6 as dotted curves and the values for δ 1 and ξ 1 are given in table 2.…”

“…Due to the sign change, the P z -component turns out to be particularly sensitive to instrumental asymmetries. Therefore, in order to fit the data to the expression (11), we had to introduce a supplementary correction procedure for the P z -components, which is described in detail in appendix B.…”

“…In order to understand this behaviour we have to take a closer look at the simplifying model of LSJ coupling. Usually, the assumption of pure LS coupling and the corresponding reduction of the number of unknown amplitudes make the complete experiment easier to perform [11,12]. However, this is not the case for the considered transitions because the equations ( 17)- (21) show that in the LSJ -coupling approximation the symmetry of the final ionic state, especially its singlet character, makes only one intrinsic parameter nontrivial for each fine-structure component (for example γ 1 ).…”

“…The ultimate goal of such investigations is a determination of the Auger decay amplitudes and their relative phase shifts from experimental data, the so-called 'complete' or 'perfect' experiment. The question of the possibility of the complete experiment for Auger decay was previously discussed theoretically [10]; first experimental investigations using different experimental methods have been performed very recently [11,12]. In our recent paper [13] the first application of spin-resolved electron spectroscopy within this concept has been published for the Xe N 4 O 2,3 O 2, 3 3 P 1 Auger decay.…”