六极取向的无规陀螺分子及其立体定向光解动力学
Hexapole-Oriented Asymmetric-Top Molecules and Their Stereodirectional Photodissociation Dynamics
摘要：
分子取向是研究碰撞和光引发过程的立体定向动力学的基本条件。在这过去的十年中，可变hexapolar电过滤器已被开发和采用的旋转状态的选择和日益复杂的分子，其中主要的困难是他们的质量，他们的低对称性和非常密集的旋转流形的对齐。在这项工作中，第一次，一个复杂的分子，如2-溴丁烷，一个不对称的顶部包含一个重原子（溴），已成功地定向放置在下游的六极过滤器的弱均匀场。定向的效率已经通过实验表征，通过结合飞行时间测量和切片离子成像检测技术。应用于定向2-溴丁烷的光解离动力学，这是在234 nm的激光波长下进行的，对应于C-Br键的断裂。Br光碎片产生在地面Br（2 P3/2）和激发Br（2 P1/2）的电子状态和两个通道的切片成像技术进行了研究，揭示了新的功能的速度和角分布相对于以前的调查非定向分子。
英文摘要：
Molecular orientation is a fundamental requisite in the study of stereodirected dynamics of collisional and photoinitiated processes. In this last decade, variable hexapolar electric filters have been developed and employed for the rotational-state selection and the alignment of molecules of increasing complexity, for which main difficulties are their mass, their low symmetry and the very dense rotational manifold. In this work, for the first time, a complex molecule such as 2-bromobutane, an asymmetric-top containing a heavy atom (the bromine), has been successfully oriented by a weak homogeneous field placed downstream the hexapolar filter. Efficiency of the orientation has been characterized experimentally, by combining time-of-flight measurements and a slice-ion-imaging detection technique. The application is described to the photodissociation dynamics of the oriented 2-bromobutane, which was carried out at a laser wavelength of 234 nm, corresponding to the breaking of the C Br bond. The Br photofragment is produced in both the ground Br (2P3/2) and the excited Br (2P1/2) electronic states and both channels are studied by the slice imaging technique, revealing new features in the velocity and angular distributions with respect to previous investigations on non-oriented molecules.
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