Spectrum ofLAuger Electrons fromTl20881andBi21283

Abstract

A study of the $L$ Auger spectrum emitted from a source of ThB in equilibrium with its decay products has been made by using a thin-magnetic-lens electron spectrometer. The $L$ Auger spectrum coincident with alpha particles has also been measured, and this has been ascribed mainly to ${}_{81}{}^{}{}_{}{}^{}\mathrm{Tl}_{}^{208}{}_{}{}^{}$. Since the directly recorded $L$ Auger spectrum is composed mainly from the $L$ spectra of ${}_{81}{}^{}{}_{}{}^{}\mathrm{Tl}_{}^{208}{}_{}{}^{}$ and ${}_{83}{}^{}{}_{}{}^{}\mathrm{Bi}_{}^{212}{}_{}{}^{}$, the latter spectrum could be obtained by subtraction of the properly normalized alpha coincident spectrum from the directly recorded spectrum. The importance of the effect of nuclear recoil accompanying alpha emission on the shape and energies of the $L$ Auger spectra is discussed and properly taken into account. The energies and intensities of fifteen lines are given for each spectrum, and a classification of these lines are made. From the experimental results the Auger and Coster-Kronig yields for the different $L$ subshells were calculated.