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Two-Photon Dissociation Dynamics of Hydroxyl Radical
Ge Sun1, Xian-feng Zheng1, Yuan Qin1, Yu Song1, Jingsong Zhang1, Jose Martin Amero2, Gabriel J. Vázquez2
1.Department of Chemistry, University of California at Riverside, Riverside, California 92521, U.S.A.;2.Instituto de Ciencias Físicas, Universidad Nacional Aut onoma de México, Cuernavaca, Morelos 62251, México
Abstract:
?Two-photon dissociation dynamics of the OH radical is studied using the high-n Rydberg atom time-of-flight (HRTOF) technique. The H(2S)+O(1D) and H(2S)+O(1S) product chan-nels are observed in the dissociation of the OH radical on the 22Ⅱ and B2Σ+ repulsive states, respectively, from sequential two-photon excitation via the A2Σ+(v'=2, J'=0.5-2.5) state. Both H+O product channels have anisotropic angular distributions, with β=-0.97 for H(2S)+O(1D) and 1.97 for H(2S)+O(1S). The anisotropic angular distributions are consistent with a mechanism of OH direct dissociation on the repulsive potential energy curves (PECs) leading to the H+O products. The OH bond dissociation energy D0(O?H) is determined to be 35580±15 cm-1.
Key words:  Photodissociation, Hydroxyl radical, Excited state, Potential energy curves
FundProject:
附件
羟基自由基双光子激发解离动力学
孙 格1, 郑贤峰1, 覃 院1, 宋 煜1, 张劲松*1, Jose Martin Amero2, Gabriel J. Vázquez2
1.美国加州大学河滨分校化学系,河滨市 92521;2.墨西哥国立自治大学物理科学研究所,莫雷洛斯 62251
摘要:
本文利用高里德堡态氢原子飞行时间探测技术,研究了羟基自由基的双光子激发解离动力学. H(2S)+O(1D)和H(2S)+O(1S)解离通道是由于羟基在经由A2Σ+(v'=2, J'=0.5-2.5)中间态通过双光子激发最终到排斥性的激发态势能曲线22Ⅱ和B2Σ+上产生. 这两种解离通道产物都具有各向异性的角向分布,其中H(2S)+O(1D)产物角分布异向因子β为-0.97,H(2S)+O(1S)产物角分布异向因子β为1.97. 各向异性的角向分布与OH自由基在排斥性的激发态势能曲线上直接解离机理相吻合. 此实验观测到羟基自由基的解离能为35580±15 cm-1.
关键词:  光解离,羟基自由基,激发态,势能曲线
DOI:10.1063/1674-0068/cjcp2003026
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