We present a velocity-map imaging (VMI) setup for photoelectron imaging that utilizes low electric extraction fields. This avoids any complications that could arise from electrostatic interactions between the extraction field and the molecular properties that are probed and has a minimal effect on the trajectory of ions in ion beam experiments. By using an attractive potential supplied to the detector, and keeping the electrodes at ground (zero) potential, we show that fringe fields between the VMI arrangement and the vacuum chamber can be eliminated, which is important in experiments on ions.
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Research Article| June 05 2012
Velocity-map imaging at low extraction fields
Daniel A. Horke;
Gareth M. Roberts;
Daniel A. Horke, Gareth M. Roberts, Julien Lecointre, Jan R. R. Verlet; Velocity-map imaging at low extraction fields. Rev. Sci. Instrum. 1 June 2012; 83 (6): 063101. https://doi.org/10.1063/1.4724311
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