Abstract
Angular distributions of the Ll, L alpha 1,2 and L beta 2,15 transitions of erbium were measured following photoionization by 8.904 keV photons. A Johansson-type monochromator was used to select the CuK beta 1 line for ionization. The angular distributions were well described by the function W( theta )=W0(1+ beta P2(cos theta )), with anisotropy parameters beta (Ll)=0.052+or-0.016, beta (L alpha 1,2)=0.016+or-0.022 and beta (L beta 2,15)=0.012+or-0.015. These values are slightly higher than the theoretical values of Berezhko and co-workers (1978). The effect of partially polarized photons on the angular distribution is discussed.
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