3dnl-J=3(E) Autoionizing Levels of Calcium - Observation by Laser Optogalvanic Spectroscopy and Theoretical-Analysis (Journal article)

Luckoenig, E./ Bolovinos, A./ Aymar, M./ Assimopoulos, S./ Jimoyiannis, A./ Tsekeris, P.

The even parity J = 3 autoionizing spectra of calcium were investigated below the 3d threshold by a two-step laser excitation from the 3d 4s metastables through the 3 d 4 p 3P2, 1F3 intermediate states. The 3 d 4 s were populated by electronic collisions in a d.c. glow discharge through a Ca heat-pipe. More than a hundred resonance transitions have been measured with an accuracy of approximately 0.2 cm-1 for the narrow ones using standard laser calibration techniques. Their upper levels are assigned to all expected nine autoionizing 3 d n s, 3 d n d and 3 d n g Rydberg series and the 4 p 5 p 3D3 perturber. The theoretical interpretation is achieved by a combination of the eigenchannel R-matrix and multichannel quantum defect (MQDT) methods. Ten closed and two open J = 3 interacting channesl are used. Theoretical energy level positions and excitation profiles are compared with the experimental data confirming the identification of the observed structures. Strong mixing between the 3d3/2 nd5/2 and 3d5/2 nd3/2 series is found, while the 3d3/2 nd3/2 and 3d5/2 nd5/2 series are almost pure jj-coupled. The calculations were particularly successful in reproducing the spectrum in the region of the 4 p 5 p 3D3 perturber, where strong chancel mixing appears leading to interference effects in the excitation cross sections.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών
Keywords: quantum-defect theory,barium
URI: https://olympias.lib.uoi.gr/jspui/handle/123456789/16830
ISSN: 0178-7683
Link: <Go to ISI>://A1994PT49300009
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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