Experimental verification of the validity of the semi-classicalapproximation for the decay dynamics on the complex potential

氢分子的双激发态主要通过自电离或中性解离衰变。竞争衰变的动力学有时用半经典近似来描述。在本研究中，我们想通过实验验证半经典近似的有效性，通过测量(i)亚稳原子碎片，H（2s）原子的飞行时间谱，在H_2的光激发下，电子对称和中性解离的最终状态被分解，以及（ii）产生两个H（2p）原子的横截面作为入射光子能量的函数。这两个实验有望提供关于衰变动力学的全面信息，特别是关于H_2的Q_2双激发态的衰变。实验(1)的研制工作即将结束。然而，2011年的T？不幸的是，东北地震影响了KEK-PF环的运行，因此研究尚未完成。

Doubly excited states of molecular hydrogen decay mainly via autoionizations or neutral dissociations. The dynamics of the competitive decay is sometimes described by the semi-classical approximation. In the present study, we would like to experimentally verify the validity of the semi-classical approximation by measuring (i) a time-of-flight spectrum of the metastable atomic fragments, the H(2s) atoms, in photoexcitation of H_2 with the electronic symmetry and final state in neutral dissociation being resolved, and (ii) the cross sections for producing two H(2p) atoms as a function of the incident photon energy. The two experiments are expected to give comprehensive information about the decay dynamics, especially for the decay of the Q_2 doubly excite states of H_2. The development of the experiment (i) was about to finish. However, 2011 T?hoku earthquake unfortunately affected the operation of the KEK-PF ring and thus the study has not completed.