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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.
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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.
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Asymmetric
extended geometry to give true stigmatic focusing with twice the dispersion
of normal geometry with the same radius sector.
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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 CO2).
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Small
analyser footprint and wide flat peak shape reduce the effect of temperature
drift therefore removing the need for peak centering during analysis.
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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.
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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.
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Suitable
for the analysis of light stable isotopes in all the commonly measured
gases; H2, N2, NO, N2O, O2,
CO, CO2, SO and SO2.
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Option
to use one or more patented reference gas injection modules at operator
defined times controlled through our proprietry IRMS software. This set-up
was developed in technical collaboration with Dr Wolfram Meier-Augenstein
at Queens University Belfast.
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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.
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