A. Kovalik et al., THE PREDICTED INFLUENCE OF RELATIVISTIC EFFECTS ON THE KL1L2(P-3(0)) AUGER TRANSITION INTENSITY OF THULIUM PROVED, Journal of electron spectroscopy and related phenomena, 83(2-3), 1997, pp. 181-191
The KLL Auger spectrum of thulium from Yb-169 decay has been analysed
at an instrumental resolution of 13 eV using a combined electrostatic
spectrometer, Energies and relative intensities of the individual KLL
transitions have been determined and compared with calculations, A rel
iable value of 0.67(5) for the KL1L2(P-3(0))/(P-1(1)) transition inten
sity ratio obtained from our partly resolved KL1L2 doublet proved, for
the first time, a sharp increase of the KL1L2(P-3(0)) intensity in th
e high Z region due to the relativistic effects predicted by relativis
tic calculations in intermediate coupling with configuration interacti
on. For the first time, a broadening of the KLL Auger lines, probably
due to the two different excitation ways of the Tm-169 atoms in Yb-169
decay (K-internal conversion and K-electron capture), has been observ
ed, A value of 19.5(8) eV was obtained for the energy separation of th
e two thulium KLL Auger spectra shifted to each other, arising from th
e individual excitation modes,and that of 0.81(9) for their intensity
ratio ('K-conversion' to 'K-capture'). (C) 1997 Elsevier Science B.V.