Direct excitation of the 'dark' b {sup 3{Pi}} state predicted by deperturbation analysis of the A {sup 1}{Sigma}{sup +}-b {sup 3{Pi}} complex in KCs
- Laser Center, Department of Physics, University of Latvia, 19 Rainis Blvd., Riga LV-1586 (Latvia)
The diode-laser-induced fluorescence spectra b {sup 3}{Pi}{sub {Omega}=0}{sup +}{yields}X{sup 1}{Sigma}{sup +} originated from the rovibronic levels of the 'dark' triplet b {sup 3}{Pi}{sub {Omega}=0}{sup +} state of KCs dimers were recorded with a Fourier transform spectrometer with a resolution of 0.03 cm{sup -1}. Term values of 30 rovibronic levels (v{sub b0}*{element_of}[14,18];J{sup '}{element_of}[47,134]) below the minimum of perturbing A {sup 1}{Sigma}{sup +} state were determined with 0.003-0.01 cm{sup -1} uncertainty. The optimal excitation and detection lines for very weak spin-forbidden b {sup 3}{Pi}{sub {Omega}=0}{sup +}-X{sup 1}{Sigma}{sup +} transitions have been properly predicted in the framework of the coupled-channels deperturbation analysis recently performed for the singlet-triplet A {sup 1}{Sigma}{sup +}-b {sup 3}{Pi}{sub {Omega}=0,1,2}{sup +} complex [A. Kruzins et al., Phys. Rev. A 81, 042509 (2010)]. The lowest observed triplet level has only 8.6% of singlet admixture.
- OSTI ID:
- 21448683
- Journal Information:
- Physical Review. A, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevA.82.032506; (c) 2010 The American Physical Society; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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