Kore Systems: Photolysis TOF-MS
High Performance Photolysis TOF-MS.

Bordeaux, France and Leeds, UK

Kore has developed a second-generation higher performance system for gas phase kinetics studies. Typically the reactions take place in a flow tube and are started with a pulsed laser.


The transient that follows may be studied by examining ions already present, or by ionising using a second laser or an electron impact source. Using a time-of-flight mass spectrometer allows all species to be followed at once.


Both analogue and digital outputs are available, the appropriate choice depending on the repetition rate available from the laser(s). For example, ion counting in raw list mode, over many nominally identical transients to build up good statistics, allows great flexibility in the subsequent retrospective data processing.


Novel ion-collection optics, placed in line with the gas entry, allow a differential pumping aperture to be sited within the spectrometer itself, close to the pulsed extraction region. This allows the spectrometer to tolerate a relatively high pressure in the source region without heroic pumping measures. The pumping system used in this example, consists of 2 240l/s turbomolecular pumps backed by a scroll pump. There can be up to 4 pressure regions.

The flow tube where the chemical reactions take placetypically 1 bar
A roughing chamber, pumped by the scroll pumptypically 0.1 to 1 mbar
The ion extraction chamber, pumped by the first turbotypically around 10-4 mbar
The spectrometer, or at any rate the bulk of it, including the detector and pumped by the second turbotypically around 10-6 mbar
  • Positive and negative ions.
  • Mass filtering of matrix peak (Bradbury Nielson gate).
  • Variable energy electron impact ioniser sited as close to the inlet as possible for high sensitivity.
  • In-line geometry to avoid energy spread issues from supersonic expansion.
  • Choice of detectors – discrete dynode with post-acceleration or dual microchannel plate.
  • Analogue and digital (counting) ion detection.
  • Interchangeable inlet orifice plates for maximum flexibility.
  • Provision for cooling inlet apertures
  • Transient acquisition mode for very high time resolution measurements.
  • Ports for laser ionisation in both pulsed ion extraction region and roughing chamber.
  • Simple to operate, dry vacuum system.
  • Flexible triggering modes to accommodate various laser schemes.

Kore Technology is a centre of excellence in time-of-flight mass spectrometer technology and has a very strong R&D capability in terms of its personnel, all of whom have been heavily involved in a variety of analytical instrumentation development programmes.


If you have any questions please feel free to contact us via our online form or telephone us for more information, we offer a wide range of products and services to suit your requirements.


If you wish to purchase our products, please contact Kore sales at sales@kore.co.uk, or call +44 (0)1353 653030.

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