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Velocity-map imaging at low extraction fields

Authors :
Julien Lecointre
Daniel A. Horke
Jan R. R. Verlet
Gareth Roberts
Source :
Review of scientific instruments, 2012, Vol.83(6), pp.063101 [Peer Reviewed Journal]
Publication Year :
2012
Publisher :
American Institute of Physics, 2012.

Abstract

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.

Details

Database :
OpenAIRE
Journal :
Review of scientific instruments, 2012, Vol.83(6), pp.063101 [Peer Reviewed Journal]
Accession number :
edsair.doi.dedup.....482ca19b22ef913b805160a904c230f1