Fan H, Pratt S T
Argonne National Laboratory, Argonne, Illinois 60439, USA.
J Chem Phys. 2006 Apr 14;124(14):144313. doi: 10.1063/1.2187975.
Velocity map imaging was used to study the 193 nm photodissociation of propargyl bromide C(3)H(3)Br as well as the photoionization dynamics of the resulting propargyl radical C(3)H(3). Images were recorded by using single-photon vacuum ultraviolet ionization of the propargyl radical and by using two-photon resonant, three-photon ionization of the ground state Br((2)P(32)) and spin-orbit excited Br()((2)P(12)) atoms. Analysis of these data allowed the determination of the branching ratio Br:Br() as well as the photofragment angular distributions. Images of C(3)H(3) produced by the photodissociation of both C(3)H(3)Br and C(3)H(3)Cl were recorded at several energies between 8.97 and 9.12 eV, as well as at 9.86 eV, and showed no obvious internal energy dependence of the relative photoionization cross sections.
速度成像技术被用于研究炔丙基溴（C(3)H(3)Br）的193纳米光解离以及所产生的炔丙基自由基（C(3)H(3)）的光电离动力学。通过对炔丙基自由基进行单光子真空紫外电离以及对基态Br((2)P(32))和自旋轨道激发态Br()((2)P(12))原子进行双光子共振、三光子电离来记录图像。对这些数据的分析使得能够确定Br:Br()的分支比以及光碎片角分布。在8.97至9.12电子伏特之间的几个能量点以及9.86电子伏特下记录了由C(3)H(3)Br和C(3)H(3)Cl光解离产生的C(3)H(3)的图像，结果表明相对光电离截面没有明显的内能依赖性。
