The identification of autoionizing states of atomic chromium for the resonance ionization laser ion source of the ISOLDE radioactive ion beam facility

T. Day Goodacre, K. Chrysalidis, D.V. Fedorov, V.N. Fedosseev, B.A. Marsh, P.L. Molkanov, R.E. Rossel, S. Rothe, C. Seiffert

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents the results of an investigation into autoionizing states of atomic chromium, in the service of the resonance ionization laser ion source (RILIS): the principal ion source of the ISOLDE radioactive ion beam facility based at CERN. The multi-step resonance photo-ionization process enables element selective ionization which, in combination with mass separation, allows isotope specific selectivity in the production of radioactive ion beams at ISOLDE. The element selective nature of the process requires a multi-step “ionization scheme” to be developed for each element. Using the method of in-source resonance ionization spectroscopy, an optimal three-step, three-resonance photo-ionization scheme originating from the 3d5(6S)4s a7S3 atomic ground state has been developed for chromium. The scheme uses an ionizing transition to one of the 15 newly observed autoionizing states reported here. Details of the spectroscopic studies are described and the new ionization scheme is summarized.
Original languageEnglish
Pages (from-to)58-63
Number of pages6
JournalSpectrochimica Acta - Part B Atomic Spectroscopy
Volume129
Early online date11 Jan 2017
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • resonance ionization laser ion source
  • ISOLDE
  • chromium
  • autoionizing states
  • laser ionization

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