Collisional quenching rates by He, N-2 and CH4 for the 4D(3/2) state in SrII

Sr+ ions were confined in a rf trap with buffer gases (He, N-2 and CH4) at several different pressures, and the fluorescence from 5p(2)P(1/2) to 5s(2) S(1/2) was detected. Increasing in the fluorescence using a pump-back laser enabled the estimation of collisional quenching rates for the 4d(2)D(3/2) State of Sr+ They are 0.27, 0.83 and 2.3 in units of 10(-16) m(3) s(-1) for He, N-2 and CH4, respectively. The experimental collisional quenching rate s were compared with the Langevin reaction rates obtained by the classical ion-molecule collision theory.