Measurement of theL2-L3Coster-Kronig transition probability in Tm(Z=69)

Abstract

The L2-L3 Coster-Kronig transition probability (fz, ) in Tm was measured by multiparameter K versus L x-ray coincidence techniques. The Tm x rays were obtained from a radioactive source of Yb and were detected with cooled germanium and silicon detectors of high-energy resolution. Corrections were applied for the contribution of Ka& x rays to the Ka2 x-ray peak and for the contribution of unresolved Lg x rays to the Lal & x-ray peak. The contribution of Ka, x rays to the Ka2 x-ray peak was determined solely from the results of the coincidence measurements using a method of data analysis which was previously described elsewhere. The contribution of Lg x rays to the La» x-ray peak was determined from the coincidence measurements and published values of the Lrt to LP, x-ray intensity ratio. The result obtained for fz3 is (13.44+0. 24) X10 or (14.06+0.24) X10 depending on the value of the Lrt to LP, intensity ratio used in applying the correction. Both values are slightly lower than predicted by the latest theoretical calculations confirming a trend of departures from theory recently observed in other medium-and high-Z atoms.

ReducedL1level width and Coster-Kronig yields by relaxation and continuum interactions in atomic zinc

“…The same theoretical work overestimated the CK yield in silver [10], where f,z and f&3 were found to be smaller by 35%%uo and 18%, respectively. A similar trend of reduction, but of slightly better agreement with relativistic calculations, was found for various fz3 yields [11,12].…”

Erbium L-subshell Coster-Kronig and fluorescence yields determination by synchrotron radiation photoionization

“…Experimental data are still scarce. The Kα-Lα coincidence method [11,12] is a powerful tool to measure f 23 as well as the fluorescence yields ω 2 and ω 3 , but cannot be applied to obtain the f 12 and f 13 yields. The selective photoionization of the L2 and L3 subshells was applied by Symsek [13,14] to obtain the f 23 Coster-Kronig yield for several elements: Dy, W, Bi, Er, Yb and Hf.…”

X-ray fluorescence activities at Saha Institute of Nuclear Physics, India

“…In single spectrum method, the precision of the measurements cannot be brought down below a few percent while in the latter, it can be brought down even less than 1%. In coincidence experiments [7][8][9][10], radioactive targets are used but for all elements, it is difficult to get the longlived radioactive targets. The alternative way will be to excite a sample with a suitable radioactive source whose excitation energy is very close to the K shell binding energy of the element.…”