O(3P0,1,2,1D2) yield ratio measurement in VUV photodissociation of O2
作者单位：Department of ChemistryUniversity of California State Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsWuhan Institute of Physics and MathematicsChinese Academy of Sciences Physical Sciences DivisionSRI International
会议名称：《第十五届全国化学动力学会议》
会议日期：2017年
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
关 键 词：superexcited oxygen quantum yield VUV photodissociation
摘 要：The quantum yield of a VUV-induced photodissociation is defined as the ratio of the number of dissociative fragment created to the number of photons absorbed. Neutral photodissociation cross sections often remain significant for several electron volts above the ionization threshold and may be composed of contributions from both direct and indirect processes. We developed a method to measure the yield ratios of O atoms in different spin-orbital state, using VUV-VUV pump-probe lasers and the time-sliced velocity-map-imaging photoion(VMI-PI) method. Combining the quantum dissociation cross section data[1], we calculated the quantum yield for O P, P, P, D and S in VUV photodissociation of O(HП, v’=2) is 0.24(2), 0.31(2), 0.26(2), 0.38(2), 0, respectively.