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Related Experiment Video

Updated: May 20, 2026

High-speed Particle Image Velocimetry Near Surfaces
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Velocity-map imaging at low extraction fields.

Daniel A Horke1, Gareth M Roberts, Julien Lecointre

  • 1Department of Chemistry, University of Durham, South Road, DH1 3LE Durham, United Kingdom.

The Review of Scientific Instruments
|July 5, 2012
PubMed
Summary
This summary is machine-generated.

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We developed a new velocity-map imaging setup using low electric fields. This method minimizes unwanted interactions with molecular properties and ion trajectories, improving experimental accuracy in ion beam studies.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Chemical Physics
  • Experimental Physics

Background:

  • Velocity-map imaging (VMI) is a powerful technique for analyzing photoelectrons and ions.
  • Traditional VMI setups can be affected by strong extraction fields, potentially altering molecular properties and ion trajectories.
  • Minimizing fringe fields is crucial for accurate measurements in ion beam experiments.

Purpose of the Study:

  • To present a novel velocity-map imaging (VMI) setup.
  • To demonstrate the advantages of using low electric extraction fields in VMI.
  • To eliminate fringe fields in VMI experiments for improved ion trajectory analysis.

Main Methods:

  • Implementation of a VMI system with low electric extraction fields.

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  • Application of an attractive potential to the detector.
  • Maintaining electrodes at ground (zero) potential.

    • Main Results:

    • The low electric field VMI setup avoids complications from electrostatic interactions with probed molecular properties.
    • The setup has minimal impact on ion trajectories in ion beam experiments.
    • Fringe fields between the VMI arrangement and the vacuum chamber were successfully eliminated.

    Conclusions:

    • The developed low electric field VMI setup offers a significant improvement for photoelectron and ion imaging.
    • This technique enhances experimental precision by mitigating field-induced artifacts.
    • The elimination of fringe fields is particularly beneficial for ion beam experiments.