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Velocity map imaging of ions and electrons using electrostatic lenses: Application in photoelectron and photofragment ion imaging of molecular oxygen

Eppink, André T. J. B., Parker, David H.·1997·Review of Scientific Instruments

Abstract

The application of electrostatic lenses is demonstrated to give a substantial improvement of the two-dimensional (2D) ion/electron imaging technique. This combination of ion lens optics and 2D detection makes “velocity map imaging” possible, i.e., all particles with the same initial velocity vector are mapped onto the same point on the detector. Whereas the more common application of grid electrodes leads to transmission reduction, severe trajectory deflections and blurring due to the non-point source geometry, these problems are avoided with open lens electrodes. A three-plate assembly with aperture electrodes has been tested and its properties are compared with those of grid electrodes. The photodissociation processes occurring in molecular oxygen following the two-photon 3dπ(3Σ1g −)(v=2, N=2)←X(3Σg −) Rydberg excitation around 225 nm are presented here to show the improvement in spatial resolution in the ion and electron images. Simulated trajectory calculations show good agreement with experiment and support the appealing properties of this velocity mapping technique.

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Metadata

Authors
Eppink, A. T. J. B., & Parker, D. H.
Venue
Review of Scientific Instruments
Published
1997-09-01
Volume
68
Issue
9
Pages
3477-3484
ISSN
  • 0034-6748 (ISSN-L)
  • 1089-7623
OpenAlex
W2166603911
Cited by
2,779
References
4
FWCI
20.56
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Velocity map imaging of ions and electrons using electrostatic lenses: Application in photoelectron and photofragment ion imaging of molecular oxygen. https://app.cochat.ai/papers/10.1063/1.1148310
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Eppink, A. T. J. B., & Parker, D. H. (1997). Velocity map imaging of ions and electrons using electrostatic lenses: Application in photoelectron and photofragment ion imaging of molecular oxygen. Review of Scientific Instruments. https://doi.org/10.1063/1.1148310

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