Overview
This thesis addresses two important and also challenging issues in the research of chemical reaction dynamics of\xa0F+H2 system. One is to probe the reaction resonance and the other is to determine the extent of the breakdown of the Born-Oppenheimer approximation (BOA)\xa0experimentally. The author introduces a state-of-the-art crossed molecular beam-scattering apparatus\xa0using a\xa0hydrogen atom\xa0Rydberg 'tagging' time-of-flight method, and presents thorough state-to-state experimental studies to address\xa0the\xa0above issues. The author also describes the observation of the\xa0Feshbach resonance in\xa0the\xa0F+H2 reaction,\xa0a\xa0precise measurement of the differential cross section in\xa0the\xa0F+HD reaction, and validation of a new accurate potential energy surface with spectroscopic accuracy. Moreover, the author determines the reactivity ratio between the ground state F(2P3/2) and the excited state F*(2P1/2) in\xa0the\xa0F+D2 reaction, and exploits the breakdown of BOA in the low collision energy.
