Chemical Dynamics Laboratory, RIKEN, Hirosawa 2-1, Wako 351-0198, Japan.
Phys Chem Chem Phys. 2011 May 14;13(18):8371-8. doi: 10.1039/c0cp01760d. Epub 2011 Feb 10.
The rovibrational state distributions and state-resolved scattering distributions of CD(3) radicals produced by the reaction O((1)D) + CD(4) were investigated by crossed molecular beam ion imaging. The rotational structure of the resonance-enhanced multiphoton ionization spectrum of CD(3) in the ground vibrational state indicates that the low K rotational states of CD(3) radicals are preferentially populated. The state-resolved scattering distributions of CD(3) (v = 0) and those of the excited states of the out-of-plane bending (v(2)) mode exhibit a structureless forward-scattering component due to an insertion pathway and a structured backward-scattering component due to an abstraction path. The scattering distributions of CD(3) in the excited state of the C-D symmetric stretch (v(1)) do not exhibit the abstraction component. The scattering distribution of the abstraction component gradually extends in the forward direction with increasing intensity as the v(2) vibration becomes more strongly excited. This suggests that abstraction with a larger impact parameter results in stronger excitation of v(2).
通过交叉分子束离子成像技术研究了 O((1)D) + CD(4) 反应生成的 CD(3) 自由基的振转态分布和态分辨散射分布。在基态中，CD(3) 的共振增强多光子电离光谱的旋转结构表明，CD(3) 自由基的低 K 旋转态优先被占据。由于插入途径，CD(3)(v = 0)的态分辨散射分布和非平面弯曲(v(2))模式的激发态的散射分布表现出无结构的前向散射分量，而由于提取途径，呈现出结构化的后向散射分量。在 C-D 对称伸缩(v(1))的激发态中，CD(3)的散射分布不表现出提取分量。随着 v(2)振动的强烈激发，提取分量的散射分布逐渐向前延伸，强度增加。这表明具有较大影响参数的提取导致 v(2)的更强激发。
