LiAr, LiKr and LiXe excimers: Photochemical formation of the - bands |
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Authors: | D Azinovi? S Milosevi? G Pichler MC van Hemert R Düren |
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Institution: | Institute of Physics, P. O. Box 304, Zagreb, Croatia, HR Department of Chemistry, Gorleaus Laboratory, University of Leiden, P. O. Box 9502, 2300 RA Leiden, The Netherlands, NL Max-Planck-Institut für Str?mungsforschung, 37018-G?ttingen, Germany, DE
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Abstract: | We investigated the photochemical formation of lithium-rare-gas excimers in the 3 state through the reaction of Li2(2(C)) and the ground-state rare-gas atom. Lithium-rare-gas vapor mixture was prepared in the heat-pipe oven. We populated the
2(C)state of the Li2 molecule using the XeCl excimer laser wavelength at 308 nm or the PTP dye laser wavelength at about 335 nm. The 3-1 transitions were observed with peaks at 414, 420 and 435 nm for LiAr, LiKr and LiXe, respectively. We estimated thermally
averaged rate constants for these photochemical reactions, which are cm3s-1 for LiAr, cm
3
s-1 for LiKr and cm3s-1 for LiXe. Ab initio potential-energy curves and transition dipole moments for LiKr were calculated applying the SCF MRDCI method. Available data
for the LiAr and LiKr excimers are presented, including potential-energy curves, electronic transition dipole moments, and
spectroscopic constants. Possible photochemical formation of these molecules in the excited states is discussed. We performed
the quantum-mechanical spectral simulations of the LiAr and LiKr 3-1 transitions, using ab initio potential-energy curves.
Received: 2 October 1998 / Received in final form: 25 January 1999 |
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Keywords: | PACS 33 20 Kf Visible spectra[:AND:] 82 20 Pm Rate constants reaction cross-section and activation energies- 34 20 Cf Interatomic potentials and forces |
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