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[en] In this study, empirical K-shell fluorescence yields (ωK) from the available experimental data for elements with 6≤Z≤99 were calculated. The experimental data are fitted using the quantity (ωK/(1-ωK))1/q (where q=3, 3.5 and 4) vs. Z to deduce the empirical fluorescence yields. A comparison is made between the results of the procedures followed here and the literature theoretical and empirical values.
[en] The L3 subshell fluorescence yield of Nd has been measured using the photoionisation by Mn Kβ X-rays (6.492 keV) emitted from a 55Fe radioisotope annular source. The present results have been found in good agreement with the theoretical values. (orig.)
[en] The first part of the present paper deals with the definition of the exchange correction in relation to rearrangements, many-body calculations and shake-up and shake-off processes. In the second part experimental and theoretical results are compared for K/L ratios of internal conversion. The observed deviations are explained in terms of the exchange corrections
[en] Since their theoretical prediction in 1997, interatomic (intermolecular) Coulombic decay (ICD) and related processes have been in the focus of intensive theoretical and experimental research. The spectacular progress in this direction has been stimulated both by the fundamental importance of the discovered electronic decay phenomena and by the exciting possibility of their practical application, for example in spectroscopy of interfaces. Interatomic decay phenomena take place in inner-shell-ionized clusters due to electronic correlation between two or more cluster constituents. These processes lead to the decay of inner-shell vacancies by electron emission and often also to disintegration of the resulting multiply ionized cluster. Here we review the recent progress in the study of interatomic decay phenomena in singly and multiply ionized clusters.
[en] The inner-shell ionization accompanying positron emission is difficult to observe due to competition with electron capture (EC) and the attendant x-rays produced which are identical to those indicating ionization. It is necessary to use a coincidence arrangement to discriminate against EC. The present study used a triple coincidence between annihilation quanta and x-rays to gate the output of a high resolution Si(L) detector
[en] A prescription is proposed for the calculation of inner shell ionization cross sections of neutral atoms (e.g. carbon, argon etc.) by electron impact in coplanar geometry. As a first step, triple differential cross sections (TDCS) are calculated for the K-shell ionization of carbon atom by fast electron impact for highly asymmetric kinematics. The distinguishing feature noted in the TDCS structure is the presence of intense recoil peak which for certain parameters is even larger than the binary peak, an unusual feature for the outer shell ionization process. Results are compared with the relative measurement performed on the C2H2 molecule as target. The binary to recoil peak intensity ratio of the present TDCS is found to be in good accord both with the experiment as well as with another theory. (orig.)