Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
Phys Chem Chem Phys. 2012 Feb 21;14(7):2468-74. doi: 10.1039/c2cp22385f. Epub 2012 Jan 16.
The vibrationally mediated photodissociation of CS(2)(+) cations via the A(2)Π(u)(ν(1),ν(2),0) state has been studied by means of the velocity map ion imaging technique. The measurements were made with a double resonance strategy. The CS(2)(+) cations were prepared by a (3 + 1) resonance enhanced multiphoton ionization method. The photo-fragment excitation spectrum of S(+) was recorded by scanning the photolysis laser via the A(2)Π(u)(ν(1),ν(2),0) state. By fixing the photolysis laser wavelength at the specific vibrational state, the (1 + 1) photodissociation images of S(+) photofragments from numerous vibrationally mediated states have been accumulated. The translational energy release spectra derived from the resulting images imply that the co-fragments, CS radicals, are both vibrationally and rotationally excited. The one-photon photodissociation without the vibrational state selection has also been performed. Comparing the vibrationally mediated photodissociation with one-photon photodissociation observations, clear evidence of vibrational state control of the photodissociation process is observed.
通过速度图离子成像技术研究了 CS(2)(+) 阳离子通过 A(2)Π(u)(ν(1),ν(2),0) 态的振动介导光解。测量是通过双共振策略进行的。CS(2)(+) 阳离子通过 (3 + 1) 共振增强多光子电离方法制备。通过扫描光解激光通过 A(2)Π(u)(ν(1),ν(2),0) 态，记录 S(+)的光碎片激发光谱。通过将光解激光波长固定在特定的振动态，从众多振动介导的态中累积了 S(+)光碎片的 (1 + 1) 光解图像。源自所得图像的平移能量释放谱表明，共碎片 CS 自由基均受到振动和旋转激发。还进行了没有振动态选择的单光子光解。将振动介导的光解与单光子光解观察进行比较，观察到光解过程的振动态控制的明显证据。
