Kore Components:
TOF-MS Optics

TOF source modules.

TOF source 1
Linear and Orthogonal Ion Extraction

As part of our mass spectrometry systems, we have designed and manufactured a wide range of TOF source modules for linear and orthogonal extraction of ions into our reflectron mass spectrometers.

 

The TOF source is at the heart of each of our mass spectrometers and can also be customised in design and operation based on client requirements.

Features
In situ electron ionisation in gas phase

This TOF-MS source features:

  1. An electron impact ionisation source, with a repeller and focussing electrode to produce a high flux sheet of electrons into the TOFMS source.
  2. A multi-electrode TOFMS source designed to create a pulse of ions for injection into a TOF analyser. The source has a backplate, a pulse-out electrode, and two further electrodes to accelerate the ion pulse up to the flight energy of the TOF analyser.

 

In this type of TOFMS source ions are created at near ground potential from gas molecules using electron impact ionisation (EI). The ions are then extracted and accelerated to their flight energy in such a way as to come to a sharp time focus at an adjustable position some way down the flight tube. Any ion optical elements following the TOFMS source, such as deflectors, must float at the potential of a field-free region that precedes the detector and reflectron, if used.

 

The filament is intended to operate at 70eV, and drive electronics are also available from Kore. Similarly, the TOF pulser is designed for pulse-out with a fast voltage edge up to 400V in amplitude. Flight potentials of 1-3 kV are typical in TOF instruments, and the final element of the TOF source is maintained at the same potential as the ‘field-free region’ (FFR) that follows the source and any deflectors. It is best if the pulser is located near the pulsing electrode, and a Kore pulser box is available to fit to a feedthrough flange onto which the TOF source is mounted.

 

 

Orthogonal extraction from ion beam

This multi-electrode TOFMS source is designed to receive a continuous (already ionised) ion stream and create pulses of ions for injection into a TOF analyser. The source has a backplate, a pulse-out electrode, and two further electrodes to accelerate the ion pulse up to the flight energy of the TOF analyser.

 

This type of TOFMS source is able to extract ions from a continuous ion stream of up to 100 volts potential (in combination with the Kore floating pulser supply). The ions are then accelerated to their flight energy in such a way as to come to a sharp time focus at an adjustable position some way down the flight tube. Any ion optical elements following the TOF source, such as deflectors, must float at the potential of a field-free region that preceeds the detector and reflectron, if used.

 

The TOFMS source is designed for pulse-out with a fast, 300-400 volt edge. Flight energies of 1-3 keV are typical in TOF instruments, and the final element of the TOF source is maintained at the same potential as the ‘field-free region’ (FFR) that follows the source and any deflectors. It is best if the pulser is located near the pulsing electrode, and a Kore pulser box is available to fit to a feedthrough flange onto which the TOF source is mounted.

 

If the ionisation source provides a divergent beam, it will be advantageous to consider a lensing system that will focus and transfer it into the source with minimal ion losses (high transmission). An example of suitable transfer optics / lens system is described in the section on ‘Matching Optics’.

 

 

TOF source 2
TOF source 3
PRICING AND ORDERING

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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