Optical pumping of ions in buffer gases

摘要: Transient signals measured with a pulsed rf-optical pumping method are used to determine longitudinal relaxation rates for Sr+ ions (even isotopes) in noble gas buffers. Depolarization cross sections of the electronic spin Sr+52S1/2 ground state binary collisions rare atoms deduced. The results σ(Sr+52S1/2) A2 (at temperatures between 374 and 449 °K): 2·10−5(He),4·10−5(Ne), 5.7·10−3(Ar), 1.8·10−2(Kr), 4.0·10−2(Xe). These ion about two three orders magnitude larger than corresponding ones isoelectronic neutral Rb atom. large increase is explained mechanism spin-orbit coupling, taking into account “indirect” effects ionic charge: kinetic more intimate atoms. depolarization shown be predominantly due short-range interactions. A contribution from Sr+-noble molecule formation, induced by three-body or resonant two-body collisions, could not established applied pressuresp 1.5 15 Torr Ar, Kr, Xe.