通过储存环实验研究氨团簇的离解复合。

Dissociative recombination of ammonia clusters studied by storage ring experiments.

作者信息

Ojekull J, Andersson P U, Någård M B, Pettersson J B C, Neau A, Rosén S, Thomas R D, Larsson M, Semaniak J, Osterdahl F, Danared H, Källberg A, Ugglas M af

机构信息

Department of Chemistry, Atmospheric Science, Göteborg University, SE-412 96 Göteborg, Sweden.

出版信息

J Chem Phys. 2006 Nov 21;125(19):194306. doi: 10.1063/1.2387174.

DOI:10.1063/1.2387174

PMID:17129102

Abstract

Dissociative recombination of ammonia cluster ions with free electrons has been studied at the heavy-ion storage ring CRYRING (Manne Siegbahn Laboratory, Stockholm University). The absolute cross sections for dissociative recombination of H+(NH3)2, H+(NH3)3, D+(ND3)2, and D+(ND3)3 in the collision energy range of 0.001-27 eV are reported, and thermal rate coefficients for the temperature interval from 10 to 1000 K are calculated from the experimental data and compared with earlier results. The fragmentation patterns for the two ions H+(NH3)2 and D+(ND3)2 show no clear isotope effect. Dissociative recombination of X+(NX3)2 (X=H or D) is dominated by the product channels 2NX3+X [0.95+/-0.02 for H+(NH3)2 and 1.00+/-0.02 for D+(ND3)2]. Dissociative recombination of D+(ND3)3 is dominated by the channels yielding three N-containing fragments (0.95+/-0.05).

摘要

在重离子储存环CRYRING（斯德哥尔摩大学曼内·西格巴恩实验室）中研究了氨簇离子与自由电子的离解复合。报告了H⁺(NH₃)₂、H⁺(NH₃)₃、D⁺(ND₃)₂和D⁺(ND₃)₃在0.001 - 27 eV碰撞能量范围内离解复合的绝对截面，并根据实验数据计算了10至1000 K温度区间的热速率系数，并与早期结果进行了比较。两种离子H⁺(NH₃)₂和D⁺(ND₃)₂的碎裂模式没有明显的同位素效应。X⁺(NX₃)₂（X = H或D）的离解复合主要由产物通道2NX₃ + X主导（H⁺(NH₃)₂为0.95±0.02，D⁺(ND₃)₂为1.00±0.02）。D⁺(ND₃)₃的离解复合主要由产生三个含氮碎片的通道主导（0.95±0.05）。