A Velocity Map Imaging apparatus optimized for high-resolution crossed molecular beam experiments
Abstract
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.
Cite
@article{arxiv.2007.04852,
title = {A Velocity Map Imaging apparatus optimized for high-resolution crossed molecular beam experiments},
author = {Vikram Plomp and Zhi Gao and Sebastiaan Y. T. van de Meerakker},
journal= {arXiv preprint arXiv:2007.04852},
year = {2021}
}