• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >An Investigation of the Reaction of CH_3S with CO
【24h】

An Investigation of the Reaction of CH_3S with CO

机译：CH_3S与CO反应的研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The reaction of CH_3S with CO was studied by using laser-induced fluorescence (LIF) to detect CH_3S radicals that were produced through pulsed laser photolysis of CH_3SSCH_3. There was no increased loss of CH_3S in the presence of CO. We place an upper limit of 1.4 * 10~(-16) cm~3 molecule~(-1) s~(-1) on the rate coefficient, k_1, for the reaction CH_3S + CO →products (1), based on the precision in our measurements. This upper limit applies between 208 and 295 K. The addition of O_2 did not enhance the rate coefficient for reaction 1. The reaction between CH_3S and CO is therefore not expected to be a significant source of OCS or loss process for CH_3S in the atmosphere. We also conclude that the reaction of CH_3SOO with CO is not sufficiently rapid to be a significant loss process for CH_3S in the atmosphere. The rate coefficients for the removal of electronically excited CH_3S (CH_3S(A)) at 295 K by CO, N_2, and O_2 were found to be (8.0 ± 0.2) * 10~(-11), (7.0 ± 1.6) * 10~(-12), and (4.8 ± 0.8) * 10~(-12) cm~3 molecule~(-1) s~(-1) (±2σ precision), respectively. Ab initio calculations indicate that formation of a weakly bound complex between ground-state CH_3S and CO is thermodynamically unfavorable, and that there are significant barriers to CH_3S·CO adduct formation and its subsequent dissociation to CH_3 + OCS, consistent with our experimental observations.
机译：通过使用激光诱导荧光（LIF）检测CH_3SSCH_3的脉冲激光光解产生的CH_3S自由基，研究了CH_3S与CO的反应。在CO存在下，CH_3S的损失没有增加。我们将速率系数k_1的上限设置为1.4 * 10〜（-16）cm〜3分子〜（-1）s〜（-1）。 CH_3S + CO→产物（1）的反应，基于我们的测量精度。此上限适用于208和295 K之间。添加O_2不会提高反应1的速率系数。因此，预计CH_3S和CO之间的反应不是大气中CH_3S的OCS或损失过程的重要来源。我们还得出结论，CH_3SOO与CO的反应不够迅速，不足以成为大气中CH_3S的重大损失过程。发现CO，N_2和O_2在295 K下去除电子激发CH_3S（CH_3S（A））的速率系数为（8.0±0.2）* 10〜（-11），（7.0±1.6）* 10 〜（-12）和（4.8±0.8）* 10〜（-12）cm〜3分子〜（-1）s〜（-1）（±2σ精度）。从头算计算表明，在基态CH_3S和CO之间形成弱结合的复合物在热力学上是不利的，并且对CH_3S·CO加合物的形成以及随后的CH_3 + OCS的解离存在显着的障碍，这与我们的实验观察一致。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号