3D velocity map imaging of electrons with TPX3CAM

Chuan Cheng; Gönenç Moğol; Thomas Weinacht; Andrei Nomerotski; Carlos Trallero-Herrero

doi:10.1063/5.0071804

3D velocity map imaging of electrons with TPX3CAM

Rev Sci Instrum. 2022 Jan 1;93(1):013003. doi: 10.1063/5.0071804.

Authors

Chuan Cheng¹, Gönenç Moğol¹, Thomas Weinacht¹, Andrei Nomerotski², Carlos Trallero-Herrero³

Affiliations

¹ Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA.
² Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
³ Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA.

PMID: 35104954
DOI: 10.1063/5.0071804

Abstract

We demonstrate three-dimensional velocity map imaging of low energy electrons using a TPX3CAM, where the three-dimensional momentum information [p_x, p_y, p_z] is encoded in position and timing [x, y, t] of hits on the camera sensor. We make use of the camera sensor for the [x, y] information and a constant fraction discriminator and fast time to digital converter in the camera for the time information. We illustrate the capabilities of our apparatus by presenting above threshold ionization measurements of xenon, which produces well defined structures in the momentum resolved photoelectron yield.