作者:Christoph Groß、Bastian Noller、Ingo Fischer
DOI:10.1039/b807049k
日期:——
We investigate the photochemistry and photodissociation dynamics of the linear C3H2 isomer propadienylidene by two-colour photofragment Doppler spectroscopy at excitation wavelengths between 260 and 230 nm, corresponding to excitation into the C 1A1 state. Propadienylidene is generated by pyrolysis from IC3H2Br. Almost complete conversion of the precursor can only be achieved at high pyrolysis temperatures. Two reaction channels, H-atom loss and loss of H2 molecules, are energetically close. Our results show that H-atom loss is indeed important in the investigated energy range. The Doppler profiles indicate that 34–37% of the excess energy is released as translation. The rates for H-atom loss are faster than the time resolution of our nanosecond-laser setup, kH > 108 s−1.
我们通过双色碎片多普勒光谱研究了线性 C3H2 异构体丙二烯亚基的光化学和光解离动力学,激发波长在 260 至 230 nm 之间,对应于激发到 C 1A1 态。亚丙二烯由 IC3H2Br 热解产生。前体的几乎完全转化只有在高热解温度下才能实现。两个反应通道,H 原子损失和 H2 分子损失,在能量上是接近的。我们的结果表明,氢原子损失在研究的能量范围内确实很重要。多普勒分布表明 34-37% 的多余能量以平移形式释放。 H 原子损失的速率比我们的纳秒激光装置的时间分辨率更快,kH > 108 s−1。