Reverse energy-pooling collisions: K(5D)+Na(3S)→K(4P)+Na(3P)

Multicrossing Landau-Zener and close-coupling calculations of electron transfer in collisions

“…The MLZ model has recently been applied to the energy-pooling process in thermal collisions between excited Na(3p) atoms (Yurova et al 1994) and to the reverse energypooling process in Na(3s)-K(5d) collisions (Guldberg-Kjaer et al 1997, De Filippo et al 1998. In both cases the MLZ model obtains reasonable agreement with the experiments (Nijland et al 1992, Guldberg-Kjaer et al 1997, De Filippo et al 1998.…”

“…The MLZ model has recently been applied to the energy-pooling process in thermal collisions between excited Na(3p) atoms (Yurova et al 1994) and to the reverse energypooling process in Na(3s)-K(5d) collisions (Guldberg-Kjaer et al 1997, De Filippo et al 1998. In both cases the MLZ model obtains reasonable agreement with the experiments (Nijland et al 1992, Guldberg-Kjaer et al 1997, De Filippo et al 1998. The semiclassical atomic-orbital close-coupling (AO-CC) calculations performed by Philipsen et al (1993) for the Na(3p)-Na(3p) system do not agree as well with the experiment as the MLZ calculations do, but besides the problem of the low collision velocity, typically 1000 m s −1 , the AO-CC approach is also complicated in this case by the effective two-electron nature of the system.…”

Energy transfer reaction K(4s) + K(7s) → K(4s) + K(5f), theory compared with experiment

“…[23] has been obtained both for adiabatic potential energy curves and spectroscopic constants. The averaged differences on spectroscopic constants for 25 molecular states are found to be Theoretical cross sections for energy transfer reaction (1) have been calculated by applying a semi classical multicrossing Landau-Zener model [24] used successfully in the treatment of energy pooling reactions between sodium and potassium atoms [16,17]. Calculations are based on the estimation of the population transfer from one PEC involved in the process to another one in the vicinity of each avoided crossing labelled by n in the text below.…”

“…In the last few decades, a lot of work has been done on reactions of energy pooling (EP) 1 , mentioned above, (and perhaps less on reverse energy pooling), also with participation of potassium, e.g., [7,[15][16][17][18].…”

Depopulation cross sections for low lying states of barium

“…With the purpose of illuminating the population transfer we have used these potential energy curves to calculate several population transfer cross sections, following a procedure which was applied successfully to calculate energy pooling cross sections in the Na(3p) + Na(3p) system (Yurova et al [15]) and reverse energy pooling in the Na-K system [16], using a semiclassical multichannel Landau-Zener model.…”