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首页> 外文期刊>The Journal of Chemical Physics >Stereodirectional images of molecules oriented by a variable-voltage hexapolar field: Fragmentation channels of 2-bromobutane electronically excited at two photolysis wavelengths
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Stereodirectional images of molecules oriented by a variable-voltage hexapolar field: Fragmentation channels of 2-bromobutane electronically excited at two photolysis wavelengths

机译：由可变电压六扑棒场取向的分子的立体二向图像：在两个光解波长下电动激发2-溴丁烷的碎片通道

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摘要

The asymmetric-top molecule 2-bromobutane is oriented by means of a hexapole state selector; the angular distribution of the bromine atom photofragment, for the two fine-structure components, is acquired by velocity-map ion imaging. The molecular beam, spatially oriented along the time-of-flight axis, is intersected with a linearly polarized laser, whose polarization is tilted by 45 degrees with respect to the detector surface. To obtain the mixing ratio of the perpendicular and parallel transitions, the fragment ion images and angular distributions can be appropriately simulated to give insight on the population mechanism of the specific electronic state involved at each selected excitation wavelength. The photofragment images obtained at 238.6 nm yielded an asymmetry factor beta(1) of 0.67, indicative of the extent of molecular orientation, and an anisotropy parameter beta(2) of 1.03, which is a signature of a prevailing parallel transition along the C-Br axis. When the photolysis wavelength is tuned to 254.1 nm, the corresponding angular distribution is less asymmetric (beta(1) = 0.24) and the obtained small value beta(2) = 0.12 is a characteristic of a predominantly perpendicular transition. The photofragment angular distributions are also affected by hexapole voltage, especially regarding the asymmetry factor, and this aspect provides information on the effect of molecular orientation. Published by AIP Publishing.
机译：不对称分子2-溴丁烷通过六哌啶型选择器取向;通过速度图离子成像获取两个细结构组分的溴原子去射碎片的角度分布。沿着飞行时间轴线定向的分子束与线性偏振激光器相交，其极化相对于检测器表面倾斜45度。为了获得垂直和平行转变的混合比，可以适当地模拟片段离子图像和角度分布，以便对每个选定的激发波长涉及的特定电子状态的群体机制进行洞察。在238.6nm处获得的光折叠图像产生0.67的不对称因子β（1），指示分子取向的程度，以及1.03的各向异性参数β（2），这是沿着C-沿着C-普遍平行过渡的标志BR轴。当光解波长调谐到254.1nm时，相应的角度分布较少（β（1）= 0.24），所获得的小值β（2）= 0.12是主要垂直转变的特征。光折叠角分布也受六脂电压的影响，特别是关于不对称因子，并且该方面提供了关于分子取向的效果的信息。通过AIP发布发布。

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