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首页> 外文期刊>The European physical journal, D. Atomic, molecular, and optical physics >Kinematically complete final state investigations of molecular photodissociation: two- and three-body decay of laser-prepared H_3 3s ~2A'_1
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Kinematically complete final state investigations of molecular photodissociation: two- and three-body decay of laser-prepared H_3 3s ~2A'_1

机译：运动学上完成分子光解离的最终状态研究：激光制备的H_3 3s〜2A'_1的两体和三体衰变

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摘要

We have performed kinematically complete investigations of molecular photodissociation of triatomic hydrogen in a fast beam translational spectrometer recently built in Freiburg. The apparatus allows us to investigate laser-induced dissociation of neutral molecules into two, three, or more neutral products. The fragments are detected in coincidence and their vectorial momenta in the center-of-mass frame are determined. We demonstrate the potential of the method at the fragmentation of the 3s ~2A_1'(N = 1, K = 0) state of triatomic hydrogen. In this state, three-body decay into ground state hydrogen atoms H+H+H, two-body predissociation into H+H_2 (v, J), and photoemission to the H_3 ground state surface with subsequent two-body decay are competing channels. In the case of two-body predissociation, we determine the rovibrational population in the H_2(v, J) fragment. The vibrational distribution of H_2 is compared with approximate theoretical predictions. For three-body decay, we measure the six-fold differential photodissociation cross-section. To determine accurate final state distributions, the geometric collection efficiency of the apparatus is calculated by a Monte Carlo simulation, and the raw data are corrected for apparatus efficiency. The final state momentum distribution shows pronounced correlation patterns which are characteristic for the dissociation mechanism. For a three-body decay process with a discrete kinetic energy release we have developed a novel data reduction procedure based on the detection of two fragments. The final state distribution determined by this independent method agrees extremely well with that observed in the triple-coincidence data. In addition, this method allows us to fully explore the phase space of the final state and to determine the branching ratios between the two- and three-body decay processes.
机译：我们已经在最近在弗莱堡建造的快速束平移光谱仪中完成了三原子氢分子光解离的运动学完整研究。该设备使我们能够研究激光诱导的中性分子解离成两个，三个或更多个中性产物。一致地检测碎片，并确定它们在质心帧中的矢量动量。我们证明了该方法在三原子氢的3s〜2A_1'（N = 1，K = 0）状态断裂中的潜力。在这种状态下，三体衰变为基态氢原子H + H + H，两体预解离为H + H_2（v，J），以及随后的两体衰变向H_3基态表面的光发射是竞争通道。在两体预解离的情况下，我们确定H_2（v，J）片段中的旋转振动种群。将H_2的振动分布与近似理论预测进行比较。对于三体衰减，我们测量了六倍的微分光解离截面。为了确定准确的最终状态分布，通过蒙特卡洛模拟计算设备的几何收集效率，并针对设备效率校正原始数据。最终状态动量分布显示出明显的相关模式，这是解离机制的特征。对于具有离散动能释放的三体衰减过程，我们已经基于检测两个碎片而开发了一种新颖的数据约简程序。通过这种独立方法确定的最终状态分布与三重合数据中观察到的状态非常吻合。另外，这种方法使我们能够充分探索最终状态的相空间，并确定两体和三体衰变过程之间的分支比。

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