The effect of internal energy on the lifetime of sulfur hexafluoride negative ions

[摘要] The lifetimes of SF-6ions produced in K(np)/SF6 collisions at high n are being investigated as a function of target temperature over the range 300K to 600K. At room temperature collisions are found to lead predominantly to the formation of long-lived SF-6ions with lifetimes tau ≳1ms. As the target temperature is raised long-lived (tau ≳0.5ms) ions are still observed but their mean lifetime is reduced. In addition, the growth of a short-lived ion signal (tau ≳10 mus) is evident which, by 600K, accounts for ∼45% of the total SF-6ion signal.These lifetimes are compared with those obtained using quasi-equilibrium theory and calculated SF-6vibrational frequencies.

[发布机构] Rice University

[效力级别] chemistry