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Related Experiment Video

Updated: Jun 18, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Velocity map imaging using an in-vacuum pixel detector.

Georg Gademann1, Ymkje Huismans, Arjan Gijsbertsen

  • 1FOM-Institute for Atomic and Molecular Physics (AMOLF), Science Park 113, 1098 XG Amsterdam, The Netherlands. g.gademann@amolf.nl

The Review of Scientific Instruments
|November 10, 2009
PubMed
Summary
This summary is machine-generated.

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New semiconductor pixel detectors (Medipix2, Timepix) enhance velocity map imaging (VMI) for charged particle detection. These detectors offer high resolution, low noise, and improved quantum efficiency, enabling VMI at higher background pressures.

Area of Science:

  • Physics
  • Instrumentation
  • Physical Chemistry

Background:

  • Velocity Map Imaging (VMI) is a powerful technique for analyzing charged particles.
  • Traditional detectors in VMI face limitations in resolution, noise, and efficiency.
  • Advancements in detector technology are crucial for pushing the boundaries of VMI experiments.

Purpose of the Study:

  • To introduce and evaluate novel in-vacuum semiconductor pixel detectors for VMI applications.
  • To assess the performance characteristics of Medipix2 and Timepix detectors in a VMI setup.
  • To investigate the feasibility of operating VMI at increased background pressures using these new detectors.

Main Methods:

  • Utilized Medipix2 and Timepix semiconductor pixel detectors (256x256 pixels, 55x55 µm²).

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Related Experiment Videos

Last Updated: Jun 18, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
07:53

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows

Published on: April 25, 2013

  • Integrated detectors into an in-vacuum VMI apparatus.
  • Characterized detector performance, including quantum efficiency, energy discrimination, and temporal resolution (10 ns for Timepix).
  • Performed VMI experiments under varying background pressure conditions.

    • Main Results:

    • Medipix2 and Timepix detectors demonstrated suitability for charged particle detection in VMI.
    • Achieved high resolution, low noise, and high quantum efficiency with the new detectors.
    • Medipix2 enabled double energy discrimination (low and high thresholds).
    • Timepix provided precise timing information (10 ns resolution, 160 µs dynamic range).
    • Successful VMI operation was demonstrated at increased background pressures.

    Conclusions:

    • Medipix2 and Timepix detectors represent a significant advancement for VMI instrumentation.
    • These detectors enhance the capabilities of VMI by offering superior performance and operational flexibility.
    • The ability to operate at higher background pressures broadens the scope of VMI studies.