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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Collision energy dependence for the Br formation in the reaction of OD + HBr
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Collision energy dependence for the Br formation in the reaction of OD + HBr

机译：OD + HBr反应中溴形成的碰撞能量依赖性

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摘要

The collision energy dependence for Br(2P3/2) atom formation in the reaction of OD + HBrhas been investigated from 0.05 to 0.26 eV using a crossed molecular beam experiment.OD radicals were selected as the single rotational state in the upper state of A-doubling of1JΩ>|3/2 3/2>=using a 1 m electric hexapole field. Br atoms were detected by the vacuumultraviolet (VUV) laser-induced fluorescence technique. We find that the reactioncross-section decreases, increasing the collision energy. This negative collision energydependence suggests that there is no barrier on the potential energy surface for theformation pathway considered. Results were compared with those previously reportedfor the OH + HBr reaction system. We find that the ratio of the reaction cross-section ofa(OD)/σ(OH) (OH) shows values larger than one and an increasing tendency when collisionenergy increases. The collision energy dependence observed is explained in terms of thezero-point energy differences and the rotational periods of OD and OH, which may berelated to the time for the proper reorientation of the OH radical prior to the reaction.
机译：使用交叉分子束实验研究了OD + HBr反应中Br（2P3 / 2）原子形成的碰撞能量依赖性，从0.05至0.26 eV.OD自由基被选为A-上态的单旋转态使用1 m的六极电场将1JΩ> | 3/2 3/2> =加倍。通过真空紫外（VUV）激光诱导的荧光技术检测Br原子。我们发现反应截面减小，增加了碰撞能量。这种负碰撞能量依赖性表明，对于所考虑的形成途径，势能表面上没有障碍。将结果与先前报道的OH + HBr反应系统的结果进行比较。我们发现，a（OD）/σ（OH）（OH）的反应截面之比显示出大于1的值，并且当碰撞能增加时，其增大趋势也增大。根据零点能量差以及OD和OH的旋转周期来解释观察到的碰撞能量依赖性，这可能与OH自由基在反应之前正确重新取向的时间有关。

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