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Digitale Medien

3dnl J=3e autoionizing levels of calcium: observation by laser optogalvanic spectroscopy and theoretical analysis (1994)

Luc-Koenig, E. ; Bolovinos, A. ; Aymar, M. ; [weitere]

Springer

The European physical journal 32 (1994), S. 49-59

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Details

ISSN: 1434-6079

Schlagwort(e): 32.80.RM ; 32.30.Jc ; 32.80.Dz

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01425923

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Digitale Medien

Preresonance Raman spectra of methylpyridines (1990)

Kosmidis, C. ; Bolovinos, A. ; Tsekeris, P.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 21 (1990), S. 737-741

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Details

ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Preresonance Raman spectra of methylpyridines (picolines) are presented for different incident laser wavelengths. A strong intensity variation of the non-totally symmetric vibration 10α is observed, which implies a vibronic coupling of the lowest nπ* excited state with the next ππ* (B2u and B1u) states. In addition an intensity increase of some totally symmetric vibrations is observed and their possible implications for the geometry of the excited ππ* states are discussed.

Zusätzliches Material: 3 Ill.