Lifetime of C2Cl4- ions produced by nondissociative electron attachment to C2Cl4

摘要

The lifetimes of long-lived C2Cl4- ions formed by Rydberg electron transfer in K(np)/C2Cl4 collisions are investigated using a Penning ion trap. Measurements at high n, n >= 30, show that low-energy electron attachment to C2Cl4 leads to the production of C2Cl4- ions with a broad range of lifetimes that extends up to at least 1 ms. This is attributed to capture by molecules in different initial vibrational states. At low n, internal-to-translational energy transfer in postattachment interactions between the product K+ and C2Cl4- ions becomes important and leads to a substantial increase in ion lifetimes. (C) 2005 American Institute of Physics.