Wirkungsquerschnitte depolarisierender Stöße von angeregten Natriumatomen mit Edelgasatomen durch optisches Pumpen mit D 2 -Licht

摘要: Optical pumping of sodium vapor withD2-light causes a rise optical transparency if complete collision-induced mixing takes place among the sublevels excited2P-states. It drop there would be no in excited states. change excited-state is as strong condition 2T=3τ predicts,T being mean collision time, τ life time The latter case can realized by certain buffer gas pressures. These pressures have been measured for gases helium, neon, and argon. From these state-mixing cross sections deduced means quoted condition. Finally so far used “uniform” model has critically revised. A more realistic proposed which ascribes excited-state-mixing to scattering phase shifts between molecularσ- andπ-states into atomic2P-state splits during collision. Nevertheless, not seriously altered even this refined model.