Depopulation cross sections for low lying states of barium

Thermal energy collisions of two p-excited alkali-metal atoms have been examined, taking into consideration the fine-structure splitting of atomic energy levels. Collisional-induced transitions between fine-structure levels and energy-pooling processes have been investigated by means of combined semiclassical approximation ͑CSA͒. The operator of evolution was constructed with the aid of a numerical solution of a time-dependent quantum electronic equation with appropriate asymptotic Hamiltonian and single trajectory approximation for nuclear motion at large internuclear separations R. Generalized multichannel Landau-Zener model with adiabatic phase averaging for small R has been included in CSA. Numerical results for cross sections in case of scattering of two 3p-excited sodium atoms in a collision energy range of 300-2000 K have been obtained. The estimation of results accuracy was carried out. The propensity rule for detailed collisional-induced finestructure transitions has been established.

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Depopulation cross sections for low lying states of barium

Abstract: Cross sections for excitation transfer between the low lying states of barium are calculated using a semiclassical Landau-Zener model and compared with existing experimental and theoretical data.

Cited by 7 publications

References 21 publications

Energy transfer in Li–Cd vapor mixture: )

Energy transfer in Li–Cd vapor mixture: )

Population of metastable barium associated with conical emission

Theory of fine-structure effects in thermal collisions of3p-excited sodium atoms: Combined quasiclassical approximation

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