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

点击翻译按钮获取中文摘要

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.