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首页> 外文期刊>The Journal of Chemical Physics >State-to-state inelastic scattering from vibrationally activated OH-H-2 complexes
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State-to-state inelastic scattering from vibrationally activated OH-H-2 complexes

机译：振动活化的OH-H-2配合物的状态间非弹性散射

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摘要

State-selective infrared excitation of o-H-2-OH via the pure OH overtone transition has been used to induce a half-collision inelastic scattering event between the OH radical and ortho-H-2 under restricted initial orientation conditions. The time evolution and final state distribution of the OH products from vibrational predissociation have been evaluated by ultraviolet probe laser-induced fluorescence measurements. The half-collision scattering takes place with similar to 3350 cm(-1) of energy available to the OH (v =1)+ o-H-2 products, an energy that exceeds the classical barrier to reaction. The OH (v=1) products are preferentially populated in high rotational levels with a distribution that is consistent with an energy gap law. A significant fraction of the OH fragments are promoted to the excited spin-orbit state in the predissociation process. A strong lambda-doubler propensity is also found, indicating that the OH unpaired p pi orbital is preferentially aligned perpendicular to the rotational plane of the OH products. Finally, the OH rotational and fine structure distributions are compared with those obtained in previous full collision inelastic scattering studies at energies below the threshold for reaction. (C) 1998 American Institute of Physics. [S0021-9606(98)01248-3]. [References: 66]
机译：通过纯OH泛音跃迁对o-H-2-OH进行状态选择性红外激发已用于在受限的初始取向条件下诱导OH自由基与邻位H-2之间的半碰撞非弹性散射事件。振动预离解的OH产物的时间演化和最终状态分布已通过紫外探针激光诱导的荧光测量进行了评估。半碰撞散射的发生类似于OH（v = 1）+ o-H-2产品可利用的3350 cm（-1）能量，该能量超过了经典的反应障碍。 OH（v = 1）产物优先以高旋转水平填充，且分布符合能隙定律。在预离解过程中，很大一部分OH片段被提升为激发的自旋轨道状态。还发现了很强的λ-倍增子倾向，表明OH未成对的p pi轨道优选垂直于OH产物的旋转平面排列。最后，将OH旋转和精细结构分布与先前的完全碰撞非弹性散射研究中在低于反应阈值的能量下获得的分布进行了比较。 （C）1998美国物理研究所。 [S0021-9606（98）01248-3]。 [参考：66]

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