Semiclassical evaluation of fine-structure mixing cross sections for Rb and Cs atoms excited to higher nD states

Laser spectroscopic measurements of fine-structure changing cross sections of Ca+and Sr+ions in collisions with He atoms

“…Most of these studies have been interested in alkali metal atoms, and have found that, when their collision partners are noble gas atoms, such collision induced transitions can occur in various electronic states lying over a wide range of energy (from the first excited 2 P J state to Rydberg states) [1][2][3][4]. For interpretation of these results, some authors have proposed a model of inelastic collisions between a noble gas atom and a (quasi-free) valence electron in an alkali atom, and the validity of this model has been demonstrated not only for Rydberg states but also for intermediately excited states [5,6].…”

Some Remarks and Calculations Concerning Collisional Fine Structure Mixing in Alkali Metal Atoms

“…As it is known the collision of a Rydberg alkali atom with a perturber in the ground state at thermal energy can be modelled from the point of view of the FS Some Remarks and Calculations Concerning Collisional... 545 mixing as consisting of two independent collisional processes: the atomic core of an alkali metal atom collides with a perturber B, and an excited electron e collides with the perturber Β [11]. Moreover, it has been established that the contribution to the mixing cross section from the core-perturber collision can usually be neglected as far as mixing and depopulation collisions are considered [14].…”

“…the recent paper [10]). As regards the FS mixing in Rydberg states, only our model of quasifree Rydberg electron given in [11] exists. It has indeed a general character but it allows a more exact calculation of J-mixing cross sections σm for nΡ1/2 states only.…”