Experimental determination of tantalum L-shell fluorescence yields and Coster–Kronig transition probabilities

Abstract

In this work, fluorescence yields and Coster–Kronig transition probabilities of the tantalum L-shell are determined with a reliable uncertainty budget.

A novel and holistic approach for experimental x-ray fundamental parameter determination—the Ru L-shell

“…To improve this situation, the International initiative on x-ray FPs [1] and others are working on revisiting and updating FP databases with new experiments and calculations employing state-of-the-art techniques for a number of years now. At the Physikalisch-Technische Bundesanstalt (PTB), well-characterized physically calibrated instrumentation is employed for dedicated experiments in order to update existing FP data for K-shell fluorescence yields [2][3][4][5], L-shell fluorescence yields and Coster-Kronig (CK) factors [4,[6][7][8][9][10], transition probabilities [11], line energies [12] and even subshell photoionization cross sections [4,13].…”

Experimental determination of ruthenium L-shell fluorescence yields and Coster–Kronig transition probabilities

“…With respect to the Coster–Kronig factors, similar uncertainties were achieved here. In summary, this uncertainty reduction will positively influence the total uncertainties of fundamental parameter-based quantitative X-ray fluorescence experiments.As stated already in previous works of our group, 14,15,24,31 the X-raylib database is also in the case of the Ru-L shell fundamental parameters a reliable reference.…”

“…Based on transmission and uorescence experiments on thin lm samples, such FP data can be derived as already demonstrated for a wide range of chemical elements. [11][12][13][14][15] 2 Experimental procedure For an experimental determination of L-shell uorescence yields and Coster-Kronig transition probabilities, both uorescence-and transmission experiments with a selective excitation of the three L-subshells on either a free standing thin foil or a thin coating on a carrier foil are required .11-13,15 In the present work, these experiments were conducted on the fourcrystal monochromator (FCM) beamline 16 of BESSY II using a vacuum chamber that is in-house developed. 17 This chamber was endowed with a silicon dri detector (SDD) of which the detection efficiency is radiometrically calibrated and the response functions are determined experimentally.…”

“…Based on transmission and fluorescence experiments on thin film samples, such FP data can be derived as already demonstrated for a wide range of chemical elements. 11–15…”

Experimental determination of the hafnium L-subshell fundamental parameters using the holistic approach

“…But more importantly, the experimental uncertainties of our new results are drastically reduced compared to what would have been provided employing the classical approach for FP determination. Typically, the achievable uncertainties for the CK factors were at best in the order of the Krause estimates [18] and usually much larger [3,27,28]. With the holistic approach the achieveable uncertainties for the CK factors can be significantly reduced [2] as compared to the conventional data evaluation approach.…”