Laser fluorescence excitation spectroscopy of the CAr van der Waals complex

Citation
J. Lei et Pj. Dagdigian, Laser fluorescence excitation spectroscopy of the CAr van der Waals complex, J CHEM PHYS, 113(2), 2000, pp. 602-610
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF CHEMICAL PHYSICS
ISSN journal
0021-9606 → ACNP
Volume
113
Issue
2
Year of publication
2000
Pages
602 - 610
Database
ISI
SICI code
0021-9606(20000708)113:2<602:LFESOT>2.0.ZU;2-Z
Abstract
Laser fluorescence excitation spectra of the CAr van der Waals complex, in the vicinity of the carbon 2s(2)2p3s P-3 degrees <-- 2s(2)2p(2 3)P and 2s2p (3 3)D degrees <-- 2s(2)2p(2 3)P atomic resonance transitions at 165.7 and 156.1 nm, respectively, are reported. A single, weak band was observed simi lar to 100 cm(-1) to the blue of the 2s(2)2p3s P-3 degrees <-- 2s(2)2p(2 3) P atomic transition. An excited-state (v('),0) progression correlating with the carbon atomic 2s2p(3 3)D degrees <-- 2s(2)2p(2 3)P transition was reco rded near the 156.1 nm atomic transition and was assigned to the CAr F (3)P i <-- X (3)Sigma(-) transition. The upper-state vibrational constants, omeg a(e)' = 31.82 +/- 0.34 cm(-1), omega(e)x(e)' = 3.58 +/- 0.11 cm(-1), were d etermined. The excited F (3)Pi state was found to be less strongly bound th an the ground state: D-0' = 54.8 +/- 1 and D-0' = 120.4 +/- 1 cm(-1). Diffe rences in the rotational contours of bands of the (CAr)-C-12 to (CAr)-C-13 isotopomers were ascribed to differences in the fine-structure splittings o f the excited F (3)Pi state. The rotational constant B-e' = 0.112 +/- 0.005 cm(-1) was estimated for the (CAr)-C-12 isotopomer. A Morse function was c onstructed to describe the potential energy curve of the F (3)Pi state. The CAr binding energy is compared with that of other diatomic complexes, and the role of predissociation in the decay of excited CAr states is discussed . (C) 2000 American Institute of Physics. [S0021-9606(00)02226-1].