The EI-TOF is a fast, sensitive detector for gas chromatography (GC) or GCxGC

A compact, electron impact (EI) mass spectrometer with a heated capillary inlet. Available in bench-top and field-deployable formats.

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Advantages of EI-TOF for GC

  • Exceptional speed, mass accuracy, and sensitivity
  • Heated capillary inlet for easy coupling to any GC or capillary format experiment
  • Flexible configuration: Laboratory and field-portable platforms
  • GC and GCxGC specific control software
  • Electron Ionization (EI) source, with optional, interchangeable chemical ionization (CI) source hardware
  • EI-TOF for Membrane Inlet Mass Spectrometry(MI-MS) also available
   Mass Resolving Power (M/dM)  LOD for OFN  LOD for Gas Detection2   Relative Mass Accuracy 
 EI-CTOF   Up to 700 5fg <200 ppt 2ppm
 EI-HTOF Up to 5000 5fg  <200 ppt 2ppm

1. Measurement with a GC x GC.  Injection of 1pg OFN (octafluoronapthalene)
2. Measurement with a compact GC x GC from Global Analyser Solutions (G.A.S.).  Injection of 100μl of 50 ppb BTX (Benzene, Toluene, Xylene).

Available Ionization methods: EI, PCI, NCI

Field Deployable Specifications:

  • Same components and same high performance as laboratory versions
  • Rack-mounted for easy transport and operation in rugged environments, including mobile laboratories
  • All components are contained in frame – including PC, control electronics, vacuum pumps and TOF
  • The heated capillary inlet extends out of frame for coupling to GC or other capillary-based techniques
  • 850 x 570 x 480 mm, 85 kg (HTOF version). Can operate in any orientation

EI-TOF  Publications


  1. “An automated gas chromatography time-of-flight mass spectrometry instrument for the quantitative analysis of halocarbons in air” Atmos. Meas. Tech. Discuss., 2015. DOI:10.5194/amtd-8-9455-2015


  1. “Improved resolution of hydrocarbon structures and constitutional isomers in complex mixtures using gas chromatography-vacuum ultraviolet-mass spectrometry” Analytical Chemistry, 2012. DOI: 10.1021/ac2030464


  1. “Quasi-simultaneous acquisition of hard electron ionization and soft single-photon ionization mass spectra during GC/MS analysis by rapid switching between both ionization methods: analytical concept, setup, and application on diesel fuel” Analytical Chemistry, 2011 DOI: 10.1021/ac200356t
  2. “A field-deployable, chemical ionization time-of-flight mass spectrometer” Atmos. Meas. Tech., 2011. DOI: 10.5194/amt-4-1471-2011


  1. “Comprehensive multidimensional separation methods by hyphenation of single-photon ionization time-of-flight mass spectrometry (SPI-TOF-MS) with GC and GCxGC “ Analytical and Bioanalytical Chemistry, 2010. DOI: 10.1007/s00216-010-4021-0


  1. “Single Photon Ionization Orthogonal Acceleration Time-of-Flight Mass Spectrometry and Resonance Enhanced Multiphoton Ionization Time-of-Flight Mass Spectrometry for Evolved Gas Analysis in Thermogravimetry: Comparative Analysis of Crude Oils” Anal. Chem., 2009. DOI: 10.1021/ac900216y


  1. “Compact ultrafast orthogonal acceleration time-of-flight mass spectrometer for on-line gas analysis by electron impact ionization and soft single photon ionization using an electron beam pumped rare gas excimer lamp as VUV-light source” Anal. Chem., 2007. DOI: 10.1021/ac071217f


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