X-ray versus Auger emission following Xe 1s photoionization

Abstract

Xe 1s photoelectron spectra were measured at SPring-8, Japan. The core-hole lifetime broadening was found to be 9.6 eV, yielding a lifetime of ∼68 as. The amount of radiative versus nonradiative decay was assessed by recording Auger LMM spectra below and above the K edge. Below the K edge, L vacancies are produced only by direct photoionization, while above the K edge some of these vacancies are mainly produced by KL emission following 1s photoionization. Due to the dipole selection rule for x-ray emission, the dominant role of the KL relaxation process is rather directly observed.

Hard x-ray photoelectron spectroscopy on heavy atoms and heavy-element containing molecules using synchrotron radiation up to 35 keV at SPring-8 undulator beamlines

“…We have also carried out similar measurements on the CH 3 I and CF 3 I molecules with slightly different photon energy, and we have extracted similar values which will be described elsewhere in detail together with the sophisticated theoretical calculations [43]. We notice that the extracted iodine 1s core-hole lifetime is very close to that of the adjacent Xe atom [34]. In the literature [44], the iodine 1s linewidth is reported to be a broader value, i.e.…”

“…In figure 3, we show the xenon 2s and 2p core-level photoelectron spectra measured at a photon energy of 6.5 keV. As can be seen in the figure, we can recognize that each line is accompanied by a satellite structure, which can be mainly attributable to the 5p→6p shakeup satellite in analogy with the Xe 1s case [34], on the lower kinetic-energy side tail. Similarly, the xenon 2s and 2p photoelectron peaks have been analyzed based on a least-square fitting procedure using Voigt functions with the same Gaussian width, taking into account the experimental resolution (∼1.3 eV at 6.5 keV excitation energy) for each peak.…”

“…The experimental setup was almost the same as the one described in our recent paper [34]. The apparatus equipped with the hemispherical electron energy analyzer SES-2002 and the gas-cell GC-50 (Scienta Omicron [25]) was used for the measurements of electron spectra.…”

“…The full width at half maximum (FWHM) of the iodine 1s core-level photoelectron peak can be estimated to be 11.82±0.36 eV by means of a least-square fitting procedure using four Voigt functions with the same Gaussian width as in the previous Xe 1s case to take account of the satellite structure [34]. In order to achieve a better experimental resolution than the previous Xe 1s case [34], we used a narrower analyzer slit in the present measurement. The electron analyzer resolution with the same setup was independently estimated by measuring the Kr 4p photoemission lines using a well-calibrated soft x-ray radiation at BL17SU before the gas-phase HAXPES experiment.…”

Detailed assignment of normal and resonant Auger spectra of Xe near the L edges

“…However, in the previous paper we published a simplified spectral assignment, sufficient to show general trends and to clarify the above-mentioned effects, but without fully attributing the configurations of the various final states in detail. Moreover, in a very recent publication some of the present authors reported the entire LMM normal Auger spectrum measured with photon energies below and above the Xe 1s − 1 ionization threshold at 34565 eV in order to study the dominant role of the KL emission subsequent to the creation of a hole in a deep K shell [16]. In that publication the spectral features were related to the different L core holes, but no detailed assignment is given.…”