Dunning, F. B.2009-06-032009-06-032007Cannon, Matt. "The effect of internal energy on the lifetime of sulfur hexafluoride negative ions." (2007) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/20495">https://hdl.handle.net/1911/20495</a>.https://hdl.handle.net/1911/20495The lifetimes of SF-6 ions 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-6 ions with lifetimes tau &gsim; 1ms. As the target temperature is raised long-lived (tau &gsim; 0.5ms) ions are still observed but their mean lifetime is reduced. In addition, the growth of a short-lived ion signal (tau &gsim; 10 mus) is evident which, by 600K, accounts for &sim;45% of the total SF-6 ion signal. These lifetimes are compared with those obtained using quasi-equilibrium theory and calculated SF-6 vibrational frequencies.81 p.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.Physical chemistryMolecular physicsAtomic physicsThesisTHESIS PHYS. 2007 CANNON