L-SUBSHELL IONIZATION CROSS-SECTIONS OF PR, SM, TB, HO, AND YB FOR 150-400 KEV PROTONS

Thick target x-ray yields of Pr, Sm, Tb, Ho, and Yb have been measured for incident protons in the energy range of 150–400 keV. Yields of the Lα12, Lγ1′ and Lγ23 transitions were first converted into x-ray cross sections, then to L-subshell ionization cross sections by the use of theoretical Coster-Kronig decay rates, fluorescence yields, and radiative decay rates. The resultant L-subshell ionization cross sections are found to be in reasonable agreement with the perturbed stationary-state theory as applied to the L shell by Brandt and Lapicki when allowance is made for relativistic effects. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.