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Real-Time Monitoring for Gas Phase H/D Exchange Reaction of H2O and D2O by Using a Compact High-Resolution Multi-Turn Mass Spectrometer


The InfiTOF™ is a compact high resolution time-of-flight mass spectrometer (TOF-MS) that has a unique multi-turn ion optics system capable of providing a variable-length ion-flight path (up to 200m) in a very compact analyzer (20cm x 20cm). The InfiTOF is able to:

  1. Detect small elements/molecules such as H+ and H2+.
  2. Allow resolving power selection based on the chosen path length for the ions.
  3. Achieve mass separation of gas components like carbon monoxide and nitrogen as CO+ (m/z 27.9949) and N2+ (m/z 28.0062).
  4. Record long-term measurements with high m/z stability (Fluctuation < 100ppm/hour), high sensitivity and high mass accuracy.

The InfiTOF enables “In-situ” high-resolution monitoring of real-time gas phase reactions. In this work, we show the real-time monitoring of a simple H/D exchange reaction of light water (H2O) and heavy water (D2O).


Mass spectra were acquired by using the InfiTOF with a multi-segment mode setting of 150 turns to give a resolving power of approximately 30,000 (FWHM) at m/z 18. Additionally, the ionizing electron voltage was set to 15 eV. Figure 1 shows a schematic drawing of the experimental equipment. A 22mL mixing vial was set up between the gas chromatograph and the mass spectrometer. A deactivated fused-silica capillary tube (3m x 0.25mm) was used for the GC – vial connection, and a deactivated fused-silica capillary tube (30cm x 0.1mm) was used for the vial – MS connection. The GC helium gas flow rate was set to 1mL/min.

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