NEGATIVE-ION PRODUCTION IN COLLISIONS BETWEEN K(ND) RYDBERG ATOMS AND CF3BR AND CF2BR2

被引：25

作者：

KALAMARIDES, A ^{[1
]}

MARAWAR, RW ^{[1
]}

LING, X ^{[1
]}

WALTER, CW ^{[1
]}

LINDSAY, BG ^{[1
]}

SMITH, KA ^{[1
]}

DUNNING, FB ^{[1
]}

机构：

[1] RICE UNIV,RICE QUANTUM INST,HOUSTON,TX 77251

来源：

JOURNAL OF CHEMICAL PHYSICS | 1990年 / 92卷 / 03期

关键词：

D O I：

10.1063/1.458048

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Negative ion production via electron transfer in collisions between K(nd) Rydberg atoms and CF3Br and CF2Br2 has been investigated over a wide range of of n(10≤n≤70). For both species, the major negative ion observed is Br-, although with CF 2Br2, a small Br2- signal is also detected. Kinematic studies show that Br- production via dissociative attachment is accompanied by sizable translational energy release (∼0.35 eV for CF3Br; ∼0.2 eV for CF2Br2). These studies further show that, despite this large energy release, post-attachment interactions between the product ions are important at intermediate values of n(n≲20) and suggest that the transient CF3Br-* and CF2Br2-* ions initially formed by electron capture have quite different lifetimes against dissociation. Cross sections for free-electron attachment to both species are derived from measurements of rate constants for electron transfer at high n. These cross sections are in reasonable agreement with results obtained in free-electron studies using the threshold photoelectron spectroscopy technique. © 1990 American Institute of Physics.

引用

页码：1672 / 1676

页数：5

共 13 条

[1] ELECTRON-ATTACHMENT LINESHAPES, CROSS-SECTIONS AND RATE CONSTANTS AT ULTRA-LOW ENERGIES IN SEVERAL HALOMETHYL AND HALOETHYL MOLECULES [J].