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arXiv · 2007.04852

A Velocity Map Imaging apparatus optimized for high-resolution crossed molecular beam experiments

Vikram Plomp·Zhi Gao·Sebastiaan Y. T. van de Meerakker
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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.

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Vikram Plomp, Zhi Gao, Sebastiaan Y. T. van de Meerakker. 2020-07-09. A Velocity Map Imaging apparatus optimized for high-resolution crossed molecular beam experiments. https://doi.org/10.1080/00268976.2020.1814437

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