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HELIX SFT
 
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  HELIX SFT





The Thermo Scientific HELIX SFT static vacuum mass spectrometer is a state-ofthe- art magnetic sector mass spectrometer for the isotopic analysis of small samples of the Noble gases. It comprises a magnetic sector analyzer with 35 cm, 120-degree extended geometry ion optics.

The HELIX SFT system is capable of analyzing all the isotopes of the Noble gases but is in particular suited to the simultaneous collection of the two isotopes of helium at masses 3 and 4. The geometry combines excellent ion optic performance with two-direction focusing and high dispersion. The analyzer incorporates novel design elements that have hitherto been unavailable in static vacuum systems.

Helium Peak shapes

Helium Peak shapes
Scans taken with the HELIX SFT showing He3 resolved from HD (upper) and typical peak shapes (lower)
(Helium data supplied by Caltech, California, USA)
 
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SKU : SID-10144001 
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Specifications:
Mass range :1 to 150 Daltons
Background :Equal or better than 5e-14 cc STP at mass 36
Sensitivity :Helium - greater than 2 x 10-4 amps/Torr at 800 µA trap current. Argon - greater than 1x10-3 amps/Torr at 200 µA trap current.
Resolution :For Faraday detector resolution > 400 For multiplier detector resolution > 700
Peak side stability :Drift to be less than the equivalent of +/- 25 ppm in mass over 30 minutes at mass 40.
Rate of rise :Rate of rise at mass 40 to be less than 1 x 10-12 cc STP/min of argon 40
Abundance sensitivity :< 1 ppb for adjacent masses (3 contribution from 4) at a pressure of 1 x 10–7 mbar. Note the individual partial pressures of other gases present, including neon and argon, must be less than 5% of that of that of the helium.