ISSN:
1434-6079
Keywords:
32.80.RM
;
32.30.Jc
;
32.80.Dz
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The even parityJ=3 autoionizing spectra of calcium were investigated below the 3d threshold by a two-step laser excitation from the 3d4s metastables through the 3d4p 3 P 2,1 F 3 intermediate states. The 3d4s were populated by electronic collisions in a d.c. glow dis-charge through a Ca heat-pipe. More than a hundred resonance transitions have been measured with an accuracy of ∼0.2 cm−1 for the narrow ones using standard laser calibration techniques. Their upper levels are assigned to all expected nine autoionizing 3dns, 3dnd and 3dng Rydberg series and the 4p 5p 3 D 3 perturber. The theoretical interpretation is achieved by a combination of the eigenchannelR-matrix and mulitchannel quantum defect (MQDT) methods. Ten closed and two openJ=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 3d 3/2 nd 5/2 and 3d 5/2 nd 3/2 series is found, while the 3d 3/2 nd 3/2 and 3d 5/2 nd 5/2 series are almost purejj-coupled. The calculations were particularly successful in reproducing the spectrum in the region of the 4p 5p 3 D 3 perturber, where strong chancel mixing appears leading to interference effects in the excitation cross sections.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01425923
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