ELECTRON-CAPTURE DECAY OF BI207 - L-SUBSHELL FLUORESCENCE YIELDS AND COSTER-KRONIG TRANSITION PROBABILITIES OF PB

Coincidence spectrometry with high-resolution Si(Li) and Ge(Li) x-ray spectrometers (resolutions 470-eV full width at half-maximum at 14.4 keV) has been employed to study directly the x rays emitted during the filling of each of the three L-subshell primary vacancies in the electron-capture decay of Bi207. The L x rays, observed in the Si(Li) detector, in fast coincidence (2τ=110 nsec) with Kα1 x rays detected in the Ge(Li) detector, arise entirely from initial vacancies in the L3 subshell, while those in coincidence with Kα2 x rays are from initial L2-subshell vacancies. The clear presence of Lα x rays, which arise only from L3 vacancies, in the latter spectrum indicates that Coster-Kronig transitions of the type L2-L3X take place. The L x rays in coincidence with 1770-, 1063-, and 570-keV γ rays and with 1063-keV L-conversion electrons give information on L1-subshell quantities. The following results are obtained: ω3=0.315±0.013, ω2=0.363±0.015, ω1=0.07±0.02, ν1=0.295±0.010, ν2=0.417±0.015, f12=0.15±0.04, f13=0.57±0.03, and f23=0.164±0.016 at Z=82. © 1969 The American Physical Society.