Processes quasiresonant

A unified description of j- j and j, m - j, m transitions was formulated in several papers for quasiresonant processes in Na -He collisions. In the semiclassical approximation with rectilinear trajectories all cross sections (transfer of population and orientation between 2P1/S and 2P3/2 states, relaxation of orientation in 2P1/2 and 2P3/2 states, and relaxation of alignment in 2P3/2 state) were calculated by Masnou and Roueff [134]. The quantal study of these processes was completed recently by Reid [135]. It has been noted [132, 136, 137] that because of quasiresonance, the semiclassical solution can also be obtained by reducing the problem to depolarization of a... 

E.E.Nikitin and B.M.Smimov, Quasiresonance processes at slow atomic collisions, Uspekhi Fiz. Nauk 124,201 (1978)... 

E.E.Nikitin and B.M.Srnirnov, Quasiresonance processes in atomic collisions, in Atomic Physics VI, Riga-New York, Zinantae-Plenum Press, 1979, p. 267... 

However, this approximation is inadequate if we want to account for the redistribution of vibrational energy among molecular modes. In these processes, anharmonic quasiresonant couplings involving different families of modes play a significant role. We account for these phenomena in Section III.E. 

Another neutralization process, the quasiresonant neutralization qRN, is observed for target atoms with core levels that lay within 10 eV of the He Is level. The most striking example is Pb, where as a function of the He, primary beam energy oscillations in the ion yield are observed [32,33]. The effect has theoretically been understood as Stueckelberg oscillation [34]. 

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