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SUMMARY:ATOMIC K-SHELL DOUBLE HOLE CREATION DUE TO ELECTRON CAPTURE AND PH
 OTOIONIZATION
DTSTART;VALUE=DATE-TIME:20220713T130000Z
DTEND;VALUE=DATE-TIME:20220713T132000Z
DTSTAMP;VALUE=DATE-TIME:20260414T120613Z
UID:indico-contribution-363@events.sinp.msu.ru
DESCRIPTION:Speakers: Maksim Kiselev (Lomonosov Moscow State University)\n
 Double core hole (DCH) states could be created in two different mechanisms
 . The first is core subshell electron capture by the nucleus and subsequen
 t shake-process of an electron from the same subshell either to the high u
 noccupied state (shake-up) or to the continuum (shake-off) mostly due to i
 nstant changing of the nucleus charge by unity. Another way is photoioniza
 tion\, when one electron is “knocked out” from the subshell and the re
 sidual one undergoes shake-process resulting from changing in screened pot
 ential. Physics of the DCH currently attracts interest stimulated by new p
 ossibilities of their creation by X-ray free electron lasers and advanced 
 synchrotron sources. Furthermore\, DCHs might become a new tool for chemic
 al analysis [1] and plasma diagnostics [2].\n\nIn this theoretical contrib
 ution we compare the two mechanisms of producing the DCH: K-electron captu
 re and K-shell photoionization. General theoretical approaches to both pro
 blems are known\, but we are not aware of such a comparison based on up-to
 -date models for many-electron atoms. We focus on DCH states in K-shell of
  $^7$Be and $^{37}$Ar (isotopes with natural electron capture radioactivit
 y). The goal is to determine double K-vacancy production probability in bo
 th described channels. Also\, we analyze shake-off electron spectra and co
 mpare the results with different theoretical approaches and experiment.\n\
 nOur model is based on sudden approximation with the use of fully non-orth
 ogonal sets of electron orbitals in initial and final states\, accounting 
 for j-splitting of the subshells. Expansions for transition matrix element
 s are obtained with ZAP_NO package [3]. Radial wave functions are construc
 ted within the multiconfigurational Hartree-Fock method [4]. Photoionizati
 on calculations are performed with the use of B-spline R-matrix (BSR) soft
 ware complex [5].\n\nThis research was funded by the Russian Ministry of S
 cience and Education grant No. 075-15-2021-1353. The work of M.D.K. is sup
 ported by the Ministry of Science and Higher Education of the Russian Fede
 ration (project No. 0818-2020-0005) using resources of the Shared Services
  “Data Center of the Far-Eastern Branch of the Russian Academy of Scienc
 es”.\n\n1. M. Nakano et al.\, Phys. Rev. Lett. 110\, 163001 (2013).\n2. 
 A.Ya. Faenov et al.\, Laser and Particle Beams 33\, 27 (2015).\n3. O. Zats
 arinny\, Comput. Phys. Comm. 98\, 235 (1996).\n4. C.F. Fischer\, T. Brage 
 and P. Jonsson\, Computational Atomic Structure: An MCHF Approach (Bristol
 : IOP Publishing\, 1997).\n5. O. Zatsarinny\, Comput. Phys. Comm. 174\, 27
 3 (2006).\n\nhttps://events.sinp.msu.ru/event/8/contributions/363/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/363/
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