Threshold behavior in electron-transfer collisions between rubidium atoms and C2F5Cl or C2F5I molecules

被引:3
作者
Jia, B
Harris, S
Lewis, LL
Zhan, JP
Brooks, PR
机构
[1] Rice Univ, Dept Chem, Houston, TX 77251 USA
[2] Rice Univ, Rice Quantum Inst, Houston, TX 77251 USA
关键词
D O I
10.1021/jp053460t
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
Rubidium atoms are accelerated in a high-temperature expansion of hydrogen to produce beams with energies high enough to observe collisional ionization with a cross beam. The speed of the atoms is directly measured by time-of-flight techniques, and the positive and negative ions produced are detected in separate mass spectrometers and detected in coincidence. Chloroperfluoroethane produces C2F5- and Cl- ions, whereas iodoperfluoroethane produces I-, C2F5-, and C2F5I- ions. When the measured speed distributions are used, the signal versus energy may be deconvolved to yield thresholds and electron affinities (EAs). The EA for C2F5I is measured to be 0.96 +/- 0.1 eV. Anomalously high EA values result for C2F5 apparently because C2F5- is produced by parts per million concentrations of Rb-2.
引用
收藏
页码:9213 / 9219
页数:7
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