PDZ Europa 20-20 isotope ratio mass spectrometer
The 20-20 isotope mass spectrometer brochure was not available however, based on evidence from other websites and the 20-22 mass spectrometer brochure the key features are very similar and are as follows:
120° extended geometry with an 11 cm radius magnetic sector giving an effective 21 cm radius dispersion and double direction focusing. Additional high dispersion long spur with 98.8° sector which creates a distance of 24 cm between the focal points for m/z 2 and 3. This leads to an abundance sensitivity at m/z 3 of <1 ppm which eliminates helium tailing in to the D/H collector.
Truly universal Faraday triple collectors for simultaneous collection of adjacent masses in the range 28,29,30 - 64,65,66 with no adjustment of collectors or amplifiers. Additional single Faraday collector and high gain amplifier for m/z 3 on the hydrogen spur.
The desired combination of the 4 collectors is selected through the software. Software switchable variable gain amplifiers and 50v amplifier outputs are available as options.
Optional extended geometry system to incorporate up to 12 collectors for custom applications.
Asymmetric extended geometry to give true stigmatic focussing with twice the dispersion of normal geometry with the same radius sector.
Shorter path length than traditional extended geometry to decrease ion/molecule interactions and so ensure 100% transmission through the analyser and a sensitivity which is higher than any other commercial IRMS (<1000 molecules/ion for CO 2 ).
Small analyser footprint and wide flat peak shape reduce the effect of temperature drift therefore removing the need for peak centring during analysis.
Design allows greater tolerance of the known variables of ion optics making the manufacture of the analyser more reproducible and less sensitive to magnet positioning.
True differential pumping by turbo-molecular pumps with a high compression ratio for both He and H2, to remove the detrimental effect of abundance sensitivity during continuous flow applications and eliminate memory.
With a mass range covering 2 to 96 AMU it is suitable for the analysis of light stable isotopes in all the commonly measured gases; H 2 , N 2 , NO, N 2 O, O 2 , CO, CO 2 , SO and SO 2 .
Triple port reference gas injection system. Suitable for calibrating each sample, using a reference gas instead of an internal standard and for easy tuning of the mass spectrometer. Size, type and positioning of reference gas pulses are under software control.
Data acquisition system uses state of the art highly stable and linear high frequency converters which produce integral slices with zero dead time and quantisation below the beam statistical noise floor at all signal levels.
The 20-22 isotope ratio mass spectrometer brochure may provide more information.
