Quantum-state resolved lifetime of triplet (ã3A2) formaldehyde

Quantum-state resolved lifetime of triplet (ã3A2) formaldehyde
复制标题

三重态 (aÌ3A2) 甲醛的量子态解析寿命

DOI:
10.1016/j.jms.2019.06.001
复制
发表时间:
2019
影响因子:
1.4
通讯作者:
G. B. Park
G. B. Park
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
B. C. Krüger;T. Schäfer;A. M. Wodtke;G. B. Park

文献摘要

参考文献

相似文献

我们报道了甲醛在第一激发三重态的态分辨寿命。在三重态原点2800 cm− 1内的泵浦激光激发之后,是延迟的F2激光电离。寿命波动范围从> 100 μ s到100 ns,并观察到很大的同位素效应。平均衰减率随电子原点以上振动能量的增加而呈指数增加,这与涉及通过电子基态上的势垒隧穿到CO+ H2/D2连续区的机制一致。通过访问的三重态,我们能够调查的分子消除反应下降到0.25 kJ/mol以下的零点能校正的活化势垒。基于经验RRKM率的模型允许估计系统间交叉矩阵元素。T1-S 0系间交叉矩阵元与在类似振动激发下观察到的S1-S 0内转换矩阵元相当。
We report state-resolved lifetimes of formaldehyde in the first excited triplet a ̃ 3 A 2 electronic state. Pump-laser excitation within 2800 cm− 1 of the triplet origin is followed by variably delayed F 2-laser ionization. Lifetimes fluctuate from> 100 μ s to∼ 100 ns and a large isotope effect is observed. The average decay rate increases exponentially with increasing vibrational energy above the electronic origin, consistent with a mechanism involving tunneling through the barrier on the electronic ground state to the CO+ H 2/D 2 continuum. By accessing the triplet state we are able to investigate the molecular elimination reaction down to∼ 25 kJ/mol below the zero-point-energy corrected activation barrier. A model based on empirical RRKM rates allows the intersystem crossing matrix elements to be estimated. The T 1–S 0 intersystem crossing matrix elements are comparable to the S 1–S 0 internal conversion matrix elements observed at similar vibrational excitation.
DOI: 10.1063/1.3085952
发表时间: 2009-03
期刊: The Journal of chemical physics
影响因子: --
作者:
Peng Zhang;S. Maeda;K. Morokuma;B. Braams
通讯作者: Peng Zhang;S. Maeda;K. Morokuma;B. Braams
DOI: 10.1063/1.4948635
发表时间: 2016
期刊: The Journal of chemical physics
影响因子: --
作者:
G. B. Park;Bastian C. Krüger;S. Meyer;D. Schwarzer;Tim Schäfer
通讯作者: Tim Schäfer
甲醛单分子解离 (H2CO→H2+CO) 的模式特异性,双模式模型
DOI: --
发表时间: 1983
期刊:
影响因子: --
作者:
B. A. Waite;S. Gray;W. Miller
通讯作者: W. Miller
DOI: --
发表时间: 1958
期刊:
影响因子: --
作者:
G. Robinson;V. DiGiorgio
通讯作者: V. DiGiorgio
3960A H2CO蒸气吸收系统
DOI: --
发表时间: 1958
期刊:
影响因子: --
作者:
S. E. Hodges;J. Henderson;J. B. Coon
通讯作者: J. B. Coon