LX-Ray Transition Probabilities in Elements of Medium and High Atomic Numbers

Abstract

Phys. 43 3067 (1965). The spin-orbit-coupling correction is negligible for 0(P2)-0 ( P(g2).~4The Ly&/Lps, LV3/Lpa, Lq/Lp&, Lp5/Lo&, Lp&/Ln&, and Ll/Lu, radiative-transition probability ratios have been measured for 13 elements ranging in atomic number from 62Sm to 92U. This has been accomplished by bombarding the elements with an electron beam of constant energy and flux, and counting the x-ray photons emitted by a given electronic transition. The corrected measured ratios are compared with the results calculated on the basis of the relativistic-Hartree-Fock-Slater (RHFS) potential and those calculated on the basis of the relativistic-screened-Coulomb QSC) potential. In general, values calculated on the basis of RHFS potential are favored except for the Ll/Le& ratio where the measured values and those obtained from a RSC-potential calculations are in excellent agreement and are as much as 40% lower than the values obtained assuming a HHFS potential, The L, y2/Lp3 and Ly3/Lp3 values obtained with a RSC potential are as much as an order of magnitude greater than experimental values at high Z, and are not included in the graphs. The estimated error of the experimental results is from 10 to 15%. Other experimental values are also included for comparison.

Inner-shell ionization by relativistic electron impact

“…This may be caused by the short interaction time between incident and bound electron at high energies. Finally, we have compiled in Table 5 measurements of the L o(L~ intensity ratio of Au using high and low energy [45] electrons, X-ray fluorescence [46] and proton bombardment [47] as well as the calculations by Scofield [48]. Apart from the value of [45] there is an overall agreement.…”

Study of vacancy decays in the L-shell photoionization of barium in the excitation energy range of 5.6–30 keV: from L2edge to energy high above the thresholds of double L-vacancy production

“…In order to understand the intrashell vacancy transfer processes, extensive effort has been put into studying the deexcitation processes associated with L-shell vacancies both experimentally [28][29][30][31][32][33][34][35] and theoretically [36][37][38][39][40]. With the advent of modern synchrotron radiation (SR) sources, photoionization methods offer substantial advantages in studying the intrashell vacancy transfer processes due to the precise energy tunability of the exciting photon beam, which enables us to selectively ionize a particular subshell of the target element.…”