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Updated: Jul 2, 2026

Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
09:53

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Published on: October 30, 2012

Low background cold cathode ion source for molecular beam detection.

M Faubel1, W M Holber, J P Toennies

  • 1Max-Planck-Institut für Strömungsforschung, 34 Göttingen, Germany.

The Review of Scientific Instruments
|April 1, 1978
PubMed
Summary
This summary is machine-generated.

A novel ion source uses carbon fiber electron emitters for sensitive molecular beam detection. Its cold cathode and cryopump enable high pumping speeds and low background pressure, ideal for scattering experiments.

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Published on: October 30, 2012

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Crossed molecular beam scattering experiments require sensitive detectors with high pumping speeds and low background pressures.
  • Traditional ion sources face limitations in achieving optimal performance under cryogenic conditions.

Purpose of the Study:

  • To describe a novel extractor gauge type electron bombardment ion source.
  • To evaluate its suitability for crossed molecular beam scattering experiments.

Main Methods:

  • Utilizing carbon fiber bundles as field electron emitters in a cold cathode configuration.
  • Integrating the ionizer with a liquid helium-cooled cryopump.

Main Results:

  • The ion source demonstrates high pumping speed for most molecules, excluding helium.
  • Achieved low background pressure, crucial for sensitive detection.

Conclusions:

  • The developed ion source is a promising detector for crossed molecular beam scattering.
  • The cold cathode and cryopump integration enables efficient operation in demanding experimental conditions.