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      https://www.ias.ac.in/article/fulltext/pram/076/02/0223-0239

    • Keywords

       

      X-ray absorption fine structure; resonant Raman scattering; characteristic X-ray; attenuation coefficient; X-ray emission-based techniques.

    • Abstract

       

      The near-edge processes, such as X-ray absorption fine structure (XAFS) andresonant Raman scattering (RRS), are not incorporated in the available theoretical attenuation coefficients, which are known to be reliable at energies away from the shell/subshell ionization thresholds of the attenuator element. Theoretical coefficients are generally used to estimate matrix corrections in routine quantitative elemental analysis based on various X-ray emission techniques. A tabulation of characteristic X-ray energies across the periodic table is provided where those X-rays are expected to alter the attenuation coefficients due to XAFS from a particular shell/subshell of the attenuator element. The influence of XAFS to the attenuation coefficient depends upon the atomic environment and the photoelectron wave vector, i.e., difference in energies of incident X-ray and the shell/subshell ionization threshold of the attenuator element. Further, the XAFS at a shell/subshell will significantly alter the total attenuation coefficient if the jump ratio at that shell/subshell is large, e.g., the K shell, L3 subshell and M$_5$ subshell. The tabulations can be considered as guidelines so as to know what can be expected due to XAFS in typical photon-induced X-ray emission spectrometry.

    • Author Affiliations

       

      Gurjeet Singh1 Sunil Kumar1 N Singh1 J Goswamy1 D Mehta1

      1. Department of Physics, Panjab University, Chandigarh 160 014, India
    • Dates

       
  • Pramana – Journal of Physics | News

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