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Extra resources for Advanced Light Source [activity rpt 1997-1998]

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W. McLaughlin, O. H. Jaecks, “Production of purely spin-aligned autoionizing stateswhich decay to orbital-aligned ionic states,” Phys. Rev. Lett. 0. (1998). W. H. Jaecks, “High resolution polarization analysis of the fluorescence from Ar+ [3P]4p2P3,2formed in photoionization,” Phys. Rev. Lett. 79, 5222(1997). 75 Ionizing Photon Energy (eV) Figure 1 Total fluorescent intensity from theAr+ 3p4[3P]4p2D3n along with the total alignment ization of this fluorescence. u, but ratherintenactwith one cloud’s spatial distribution, which can be used to quantify the anothez One si~ature ofmch electronintera~”on, or relativistic interactions between the autoionizing ns Rydberg for corre/atz”on, k the observationof two excz”tedekz-trons electron, the 3p4 subshell, and the 4p valence electrons.

Obvious intensity dif- backward asymmetry. To demonstrate how signifi- ferences between the 2s and 2p photoemission peaks cant nondipole effects can be for angular-distribution are due to nondipole effects. The solid red and green patterns, the dotted red and green curves and all three blue curves in Figure 4 exemplifj extreme val- curves in Figure 4 represent nondipole angular- ues for 8 or y. All curves show the same ejection emission inferred from Figure 5. Other spectra show probability along they axis and in they-z plane and also show large differences in the forward and back- 250 eV.

In the dipole approximation, a single parameter, ~, completely describes electron angular distributions as a function of the angle, 0, relative to the c polarization, E, of the ionizing radiation (Figure 3). The solidly colored regions in Figure 4 represent angle-dependent photoemission patterns (with the ejection probability in any direction proportional to . 45 ....... ’.. -”.. E(y) J “... 67 k(x) ~ in its range from -1 to 2. For these dipoleapproximation patterns, the angular distribution is always symmetrical around E and is isotropic for the special case of ~ = O (Figure 4a).

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