Experimental and theoretical analysis of the 5pnp J = O-e, 1(e), 2(e) autoionizing spectrum of Sr (Journal article)

Cohen, S./ Aymar, M./ Bolovinos, A./ Kompitsas, M./ Luc-Koenig, E./ Mereu, H./ Tsekeris, P.

The even parity 5pnp J = 0, 1 and 2 doubly excited autoionizing states of strontium were investigated both experimentally and theoretically. Sr atoms in an atomic beam were excited through the two-step isolated Core Excitation (ICE) scheme 5s(2) S-1(o) -lambda (1) --> 5sn'p P-1(1) (n' = 12-16) -lambda (2) --> [5p(3/2)np](J). The final ICE transition probes the [5p(3/2)np](J) resonances. However, the [5p(1/2)np](J) series below the 5p(1/2) threshold were excited also due to their mixing with the [5p(3/2)np](J) perturbers. An extended energy region was covered below and above the 5p(1/2) ionization limit by saturating the central ICE lobe and recording as many as possible "red" and "blue" secondary lobes. J identification was achieved by using mutually parallel and perpendicular linear polarizations of the laser beams. The ICE spectra were compared to those obtained by employing a two-step excitation scheme using the bound 4d5p P-1(1) valence state as an intermediate one. Final identification for very complex structures was achieved after comparison with theoretical energy level positions and excitation profiles produced by the R-matrix method combined with the multichannel quantum defect theory (MQDT) method. The agreement between theoretical and observed structures is quite satisfactory.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών
Keywords: laser optogalvanic spectroscopy,eigenchannel r-matrix,quantum-defect theory,rydberg series,barium,states,threshold,strontium,calcium,ba
URI: https://olympias.lib.uoi.gr/jspui/handle/123456789/16189
ISSN: 1434-6060
Link: <Go to ISI>://000166830400002
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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