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.
The Lz L, -Coster-Kronig transition probability fz3 in Nd was measured using multiparameter K-vs-L x-ray coincidence techniques. The Nd x rays were obtained from a radioactive source of ' 'Pm. High-energy-resolution germanium and silicon detectors were used to detect the K and L x rays, respectively. A method is described to correct for the very important contribution of Ka& x rays to the Kaz x-ray peak as well as for the small contribution of Ka2 x rays to the Ka& x-ray peak.The contribution of L g x rays to the measured Ka2-(La+ L g) coincidences was calculated and subtracted. The value obtained, fz3=0. 14620.005, is lower than that predicted (0.170) by the latest theoretical calculations, confirming a trend of deviations from theory recently observed in atoms of higher atomic number. It differs, however, from another recently reported value of 0. 123+0.013.
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