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Title: Evolution of Au L{beta}{sub 2} visible satellites around thresholds

Abstract

Au L{beta}{sub 2} satellites were investigated around the L{sub 1} absorption edge with a high-resolution Johann-type spectrometer at the BL15XU undulator beamline SPring-8. The intensities of the L{beta}{sub 2} satellites were drastically changed at the threshold. Therefore, it is confirmed that the two visible satellites L{beta}{sub 2}{sup '} and L{beta}{sub 2}{sup ''} are mainly attributed to the L{sub 1}-L{sub 3}M{sub 4,5} Coster-Kronig transitions accompanied by the double-hole states of L{sub 3}M{sub 4} or L{sub 3}M{sub 5}.

Authors:
; ; ; ;  [1];  [2];  [2];  [2]
  1. Laboratory of Atomic and Molecular Physics, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan)
  2. (Japan)
Publication Date:
OSTI Identifier:
20974569
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.73.022507; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ABSORPTION; COSTER-KRONIG TRANSITIONS; ELECTRONIC STRUCTURE; EVOLUTION; GOLD; PHOTON-ATOM COLLISIONS; SPECTROMETERS; SPRING-8 STORAGE RING; WIGGLER MAGNETS; X-RAY SPECTRA

Citation Formats

Oohashi, H., Ito, Y., Tochio, T., Vlaicu, A. M., Mukoyama, T., Keihanna Interaction Plaza Inc., Seika-cho Soraku-gun, Kyoto 619-0237, National Institute for Material Science, Harima office, SPring-8, Mikazuki, Hyogo 679-5198, and Kanasai Gaidai University, 16-1 Nakamiya-Higashinocho, Hirakata, Osaka 573-1001. Evolution of Au L{beta}{sub 2} visible satellites around thresholds. United States: N. p., 2006. Web. doi:10.1103/PHYSREVA.73.022507.
Oohashi, H., Ito, Y., Tochio, T., Vlaicu, A. M., Mukoyama, T., Keihanna Interaction Plaza Inc., Seika-cho Soraku-gun, Kyoto 619-0237, National Institute for Material Science, Harima office, SPring-8, Mikazuki, Hyogo 679-5198, & Kanasai Gaidai University, 16-1 Nakamiya-Higashinocho, Hirakata, Osaka 573-1001. Evolution of Au L{beta}{sub 2} visible satellites around thresholds. United States. doi:10.1103/PHYSREVA.73.022507.
Oohashi, H., Ito, Y., Tochio, T., Vlaicu, A. M., Mukoyama, T., Keihanna Interaction Plaza Inc., Seika-cho Soraku-gun, Kyoto 619-0237, National Institute for Material Science, Harima office, SPring-8, Mikazuki, Hyogo 679-5198, and Kanasai Gaidai University, 16-1 Nakamiya-Higashinocho, Hirakata, Osaka 573-1001. Wed . "Evolution of Au L{beta}{sub 2} visible satellites around thresholds". United States. doi:10.1103/PHYSREVA.73.022507.
@article{osti_20974569,
title = {Evolution of Au L{beta}{sub 2} visible satellites around thresholds},
author = {Oohashi, H. and Ito, Y. and Tochio, T. and Vlaicu, A. M. and Mukoyama, T. and Keihanna Interaction Plaza Inc., Seika-cho Soraku-gun, Kyoto 619-0237 and National Institute for Material Science, Harima office, SPring-8, Mikazuki, Hyogo 679-5198 and Kanasai Gaidai University, 16-1 Nakamiya-Higashinocho, Hirakata, Osaka 573-1001},
abstractNote = {Au L{beta}{sub 2} satellites were investigated around the L{sub 1} absorption edge with a high-resolution Johann-type spectrometer at the BL15XU undulator beamline SPring-8. The intensities of the L{beta}{sub 2} satellites were drastically changed at the threshold. Therefore, it is confirmed that the two visible satellites L{beta}{sub 2}{sup '} and L{beta}{sub 2}{sup ''} are mainly attributed to the L{sub 1}-L{sub 3}M{sub 4,5} Coster-Kronig transitions accompanied by the double-hole states of L{sub 3}M{sub 4} or L{sub 3}M{sub 5}.},
doi = {10.1103/PHYSREVA.73.022507},
journal = {Physical Review. A},
number = 2,
volume = 73,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}
  • Measurements of L{beta} spectra of gold using a high-resolution single-crystal x-ray spectrometer are presented. Energy values and intensities of the L{beta}{sub 2} satellite lines are confirmed by fitting Voigt functions to the observed spectra. Relative intensity ratios of L{beta}{sub 2}, L{beta}{sub 3}, L{beta}{sub 15}, and L{beta}{sub 2} satellite lines are investigated at various excitation energies. The origin of the L{beta}{sub 2} satellite lines, L{beta}{sub 2}{sup '} and L{beta}{sub 2}{sup ''}, are confirmed to be mainly due to the L-LM Coster-Kronig transition, with intensities closely related to the photoionization cross section of the subshell L{sub 1}.
  • With the advent of the third generation synchrotron radiation, we can perform experiments on the threshold behavior of the satellites including the excitation dynamics in atoms. Especially, x-ray emission spectroscopy is a suitable tool to study the satellites on the electron correlation. The contributions of direct ionization, i.e, the shake-off process in Fe and indirect ionization of Coster-Kronig transition in Au have not been investigated to the x-ray emission spectra yet. We present the contribution of the spectator holes to the processes around the threshold.
  • A novel heterojunction structured composite photocatalyst CdS/Au/g-C{sub 3}N{sub 4} has been developed by depositing CdS/Au with a core (Au)-shell (CdS) structure on the surface of g-C{sub 3}N{sub 4}. The photocatalytic hydrogen production activity of the developed photocatalyst was evaluated under visible-light irradiation (╬╗ > 420 nm) using methanol as a sacrificial reagent. As a result, its activity is about 125.8 times higher than that of g-C{sub 3}N{sub 4} and is even much higher than that of Pt/g-C{sub 3}N{sub 4}. The enhancement in photocatalytic activity is attributed to efficient separation of the photoexcited charges due to the anisotropic junction in themore » CdS/Au/g-C{sub 3}N{sub 4} system.« less
  • The X-ray satellites L{beta}{sub 1}{sup I}, L{beta}{sub 1}{sup II}, L{beta}{sub 1}{sup III}, L{beta}{sub 1}{sup IV}, L{beta}{sub 2}{sup I}, L{beta}{sub 2}{sup (b)}, L{beta}{sub 2}{sup II} and L{beta}{sub 2}{sup (c)} observed in the L-emission spectra in elements with Z = 26 to 92, have been calculated. The energies of various transitions have been calculated by available Hartree-Fock-Slater (HFS) data using the semi-empirical Auger transition energies in the doubly ionized atoms and their relative intensities have been estimated by considering cross - sections of singly ionized 2x-1 (x {identical_to} s, p) states and then of subsequent Coster-Kronig and shake off processes. The calculatedmore » spectra have been compared with the measured satellite energies in the L emission spectra. Their intense peaks have been identified as the observed satellite lines. The one to one correspondence between the peaks in calculated spectra and the satellites in measured spectra has been established on the basis of the agreement between the separations in the peak energies and those in the measured satellite energies. Group of transitions under the transition schemes L2Mx-MxM4,5 and L3Mx-MxN4,5 (x {identical_to} 1-5), which give rise to these satellites have been identified. It is observed that the satellite L{beta}{sub 2}{sup (b)} in all these spectra can be assigned to the superposition of 3F4-3G5 and 3F4-3D3 transitions and that this must be most intense one out of all these satellites, contributing in order of decreasing intensity. Each of the remaining satellites is found to have different origin in different elements. The possible contributions of the suitable transitions to all these lines have also been discussed.« less
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