论文标题
针对高分辨率交叉分子束实验优化的速度图成像设备
A Velocity Map Imaging apparatus optimized for high-resolution crossed molecular beam experiments
论文作者
论文摘要
我们介绍了针对使用鲜明或Zeeman减速器的高分辨率越过分子束实验的需求而定制的速度图成像设备的设计。这些实验的关键要求包括用于大电离体积的高相对速度分辨率和相对较低的实验室框架速度的组合。 Simion软件包被用于系统地优化电极几何形状和电配置。最终设计由一个由16个管状电极组成的堆栈，该电极与电阻相连，该电阻分为三个电场区域。所得的设备允许固有的速度模糊小于1.1 m/s，而无$^+$ $离子源自源自3x3x3 mm电离体积，这在典型的交叉梁实验中可以忽略不计。该设计最近在几个最先进的横梁实验中采用，从而可以在散射分子的速度分布中观察细节。
We present the design of a Velocity Map Imaging apparatus tailored to the demands of high-resolution crossed molecular beam experiments employing Stark or Zeeman decelerators. The key requirements for these experiments consist of the combination of a high relative velocity resolution for large ionization volumes and a broad range of relatively low lab-frame velocities. The SIMION software package was employed to systematically optimize the electrode geometries and electrical configuration. The final design consists of a stack of 16 tubular electrodes, electrically connected with resistors, which is divided into three electric field regions. The resulting apparatus allows for an inherent velocity blurring of less than 1.1 m/s for NO$^+$ ions originating from a 3x3x3 mm ionization volume, which is negligible in a typical crossed beam experiment. The design was recently employed in several state of the art crossed-beam experiments, allowing the observation of fine details in the velocity distributions of the scattered molecules.
