Synchrotron-radiation-based determination of XeL-subshell Coster-Kronig yields: A reexamination via high-resolution x-ray spectroscopy

Abstract

The xenon L-subshell Coster-Kronig (CK) transition yields were revisited via high-resolution measurements of the Lα 1,2 (L 3 − M 4,5 ) and Lβ 1 (L 2 − M 4 ) x-ray emission lines. The L x-ray spectra were measured employing a Johansson-type curved crystal spectrometer and energy-tunable synchrotron radiation. The CK yields were derived from the relative L x-ray intensity jumps at the L edges by fitting the fluorescence intensities as a function of the photon energy to the L-subshell photoionization cross sections. The latter were obtained from the measured L-edge photoabsorption spectrum. Values of 0.118 ± 0.029, 0.383 ± 0.037, and 0.096 ± 0.016 were found for the f 23 , f 13 , and f 12 CK yields, respectively. Thanks to high resolution, the L 1 fluorescence yield of 0.059 ± 0.002 was also determined from intensity ratios of the well-resolved Lβ 4 (L 1 − M 2 ) and Lβ 1 (L 2 − M 4 ) lines. PACS number(s): 32.70.−n, 32.80. Hd, 32.50.+d, 32.30.Rj

Probing Coster–Kronig Transitions in Aqueous Fe2+ Solution Using Inverse Partial and Partial Fluorescence Yield at the L-Edge

“…Similarly, CK transitions were shown to be quite sensitive to chemical bonding in 3d TMs. , The near threshold sensitivity of the CK transition makes it a potential tool for investigating the effect of the surrounding atoms on the probed element. Qualitative and quantitative studies have been performed to analyze the CK process from the L 2 /L 3 emission intensity ratio in 3d TMs. − Yet, observations of CK transitions have hitherto been limited to solids and gases, while, here, we present the first study in solution, observing CK transitions of dissolved Fe 2+ ions from a FeCl 2 solution in water. Beyond the sensitive behavior with respect to CK transitions, 3d TMs are of more general interest due to their variety of functions as catalysts and their key role in biology as active centers of proteins…”

DoubleL3Mionization of Pd induced by impact with medium-energy electrons

“…Note that a more precise determination of E thr TS would represent a challenging task because for electron energies close to the threshold the LαM satellite lines due to the TS process are characterized by very low count rates, which leads to high statistical errors. In addition, available experimental CK yields [16,34,35] all suffer from rather large uncertainties. On the other hand, the obtained threshold energy is bigger than the value of 3.65 keV provided by the (Z+1) potential approximation [Eq.…”

A critical analysis of the experimental L‐shell Coster–Kronig and fluorescence yields data

“…Recent measurements using crystal diffraction spectrometers clearly demonstrate that there is a very different energy dependence, with a large number of structures in the absorption coefficient figure 4 of the literature . The synchrotron measurement with energy dispersive and wavelength dispersive spectrometers yielded essentially the same results for the measurement on Xe, both deviating from the photoabsorption cross‐sections and, therefore introducing model dependence by employing far‐range extrapolation. We have observed previously that the independent particle approach is not sufficient to describe the vacancy decay via X‐rays.…”

“…Therefore, it would be subjective to draw a conclusion. Fortunately, there are additional measurements with a different technique, which in principle are very important, as methodological problems are different; therefore, it can give a strong support.…”

“…In the semiconductor detector measurements, beside the obvious although not trivially handled issues, such as accounting for detector tailing, the true input rate, and spectrum fitting, the selection of measurement points could introduce a significant flaw. As we can see in the recent papers, the specific selection of energy values where data were taken can introduce a bias, especially because extrapolation is used to derive the data. Therefore, in a later section, we will give a short overview of the features we expect to be present in the energy dependence from a theoretical point of view.…”