Collisional stabilization of highly vibrationally excited o-, m- and p-xylene ions (C8H10+) from 300-900 K and 1-250 Torr

被引：4

作者：

Fernandez, AI

Dotan, I

Miller, TM

Troe, J

Friedman, JF

Viggiano, A

机构：

[1] USAF, Res Lab, Space Vehicle Directorate, Hanscom AFB, MA 01731 USA

[2] Open Univ, Dept Nat Sci, IL-43107 Raanana, Israel

[3] Boston Coll, Inst Sci Res, Chestnut Hill, MA 02167 USA

[4] Univ Gottingen, Inst Chem Phys, D-37077 Gottingen, Germany

[5] Univ Puerto Rico, Dept Phys, Mayaguez, PR 00681 USA

[6] USAF, Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA

来源：

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY | 2006年 / 249卷

关键词：

xylene; collisional stabilization; unimolecular dissociation; pressure dependence; temperature dependence;

D O I：

10.1016/j.ijms.2005.11.020

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Branching ratios for the reactions of O-2(+) with all three xylene isomers have been measured as a function of temperature over a wide range (300-900 K) at a fixed number density (1.45 x 10(16) molecule cm(-3) of helium) and for in-xylene over an extended buffer gas pressure (50-250 Torr of nitrogen) and temperature (473-623 K) range. Rate constants measured under selected conditions indicate that the reactions proceed at the collisional rate. Two main products were observed in each reaction: the stabilized parent ion, C8H10+ (S) and a dissociative charge transfer product, C7H7+ (D). The ratio of S/D was found to vary significantly with both temperature and pressure. At high pressure very little dissociation occurred. Results of statistical modeling similar to that used in our studies of n-alkylbenzenes represent the data well. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：379 / 384

页数：6