Physics – Chemical Physics
Scientific paper
2007-06-20
Physics
Chemical Physics
Extended version of presentations in the conferences ECAMP9 and HRMS20. Note that the figures (9 EPS. files) should be downloa
Scientific paper
Exactly solvable rererence potentials of several smoothly joined Morse-type components were constructed for the lowest two excimer states of Ar2 molecule. The parameters of the potentials have been ascertained by fitting to the experimental data, and they are reliable in a wide range of nuclear separations. A large number of quantum mechanical Franck-Condon factors for bound-free and bound-bound transitions have been calculated and compared with the observed spectroscopic features. The fitting procedure also involved dipole transition moments, which have been adjusted to the known radiative lifetimes of the vibrational levels. The resulting potential energy curves accurately reproduce the first and the second emission continua of Ar2* as well as the oscillatory spectrum related to their inner turning point region. The numbering and the positions of the vibrational levels reported by Herman et al. [P. R. Herman, P. E. LaRocque, and B. P. Stoicheff, J. Chem. Phys. 89, 4535 (1988)] have been confirmed.
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