Semiclassical evaluation of fine-structure mixing cross sections for K and Rb atoms excited to higher nP_1/2states

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

“…The rise of the cross sections and then decrease with n, characteristic for intermediate n values, is very clearly seen. Steady decreasing of the cross section for Ne even in the region of low n is caused by very small (σe)n*P Some Remarks and Calculations Concerning Collisional... 547 cross section and consequently small probability of Na-Ne mixing collisions [13]. The decrease of the cross section σnP1/2-nP3/2(V) for Na-Na collisions for n > 14 is connected with a decreasing of the total cross section σ e ((ve )n*P) caused by the Ramsauer effect.…”

“…So, our model seems to be not sufficiently good there. Some results, mentioned above, were nevertheless encouraging, so that σm 's were calculated [13] for nΡ 1 /2 states of Κ (n = 8 24) and Rb atoms (n = 10 24) colliding with noble gas atoms and Ν2 and for collisions Κ(nΡ1/2)+K(4S 1 /2), n = 10 24 and Rb(nΡ1/ 2 )+Rb(5S1/2), n = 12 24, applying the same model. Unfortunately, there have been no experimental data to be compared with.…”

“…As in [13] we concentrate on the P1/2 state because for this state an exact calculation of the total elastic and inelastic cross section Q nP1/2(V) is possible. For the P3/2 state only estimations of the upper and lower limits of the cross section are possible because of practical reasons.…”

“…So the FS components intensity anomaly has been neglected. The FS mixing cross sections ^nP l^Z^nP (V) have been obtained from the relation [13]:…”

Level broadening cross sections for nP1/2Rydberg states of Na, K and Rb atoms

“…It would be interesting to determine more precisely limits of application of the model, to answer the question whether it may be applied to the collision of an excited alkali atom with a ground-state alkali atom which has been investigated by Mazing and Serapinas (1971) complete explanation has not been found. The applicability, recently stated, of the semiclassical model of 1 mixing (de Prune16 and Pascale 1979, hereafter referred to as PP) to a broad range of collisional processes including J mixing in alkali Rydberg atoms (Sirko andRosihki 1986, 1987) gives the possibility of obtaining new results.…”