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L subshell fluorescent X-ray measurements to study CK transitions in the 66≤ Z ≤83 region

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Abstract

L subshell fluorescent X-rays in Dy, Ho, Er, Lu, Ta, W, Pt, Au, Hg, Pb and Bi have been measured using synchrotron with selective creation of electron vacancies in individual subshells. Coster–Kronig (CK) yields were derived from the measured intensities. Present measurements have been made at photon energies above the edges where differences between measured and theoretical attenuation coefficients are almost negligible. Parametric trends for the results with Z were developed to cover all Zs in the range of 66–83. The trends predict the switching-off of L 1–L 2, N1 transition at Z = 67. The extent of fall /rise of f Lij values corresponding to off /on of certain transitions is found inversely proportional to the difference in binding energies of two consecutive subshells involved in the transition. For Zs above /below these rises /falls, f L13 and f L12 values are almost constants. f L23 values involving no break at Zs follow the general photoionization behaviour that ionization probability is highest at the edge energy and decreases with photon energy. Yield measurements with synchrotron radiation for Dy, Ho, Lu, Hg and Bi and experimental values for f L23, f L12 in Lu and for f L13 in Ta are being quoted for the first time.

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Acknowledgements

This work is done on Indus-2 synchrotron radiation facility at Raja Ramanna Centre for Advanced Technology, Indore. The accommodating gesture of RRCAT authorities for the experiment, especially the guidance provided by Prof. G S Lodha and financial assistance from UGC-DAE in the form of project grant (CSR-IC-BL-18/CRRS-115/2014-15/1211) are highly acknowledged.

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Authors and Affiliations

  1. Nuclear Science Laboratories, Physics Department, Punjabi University, Patiala, 147 002, India

    GURPREET KAUR, HIMANI BANSAL & RAJ MITTAL

  2. X-ray Optics Section, Indus Synchrotron Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore, 452 013, India

    M K TIWARI

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  1. GURPREET KAUR
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  2. HIMANI BANSAL
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  3. M K TIWARI
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Correspondence to RAJ MITTAL.

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KAUR, G., BANSAL, H., TIWARI, M.K. et al. L subshell fluorescent X-ray measurements to study CK transitions in the 66≤ Z ≤83 region. Pramana - J Phys 87, 33 (2016). https://doi.org/10.1007/s12043-016-1223-9

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  • DOI: https://doi.org/10.1007/s12043-016-1223-9

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