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.

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 7005fg<200 ppt2ppm
 EI-HTOFUp to 50005fg <200 ppt2ppm

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

Related Applications

We have delivered the EI-TOF for uses ranging from GCxGC analysis of petroleum samples to real-time air quality analysis aboard research aircraft.

close slider
Contact Us Pop Up

We would like to hear from you. Please send us a message by filling out the form below or email, and we will get back with you shortly.


Contact Us Product Pop Up
We will provide you with regular product updates and application data via email. You can change your mind at any time by clicking the unsubscribe link in the footer of any email you receive from us, or by contacting us at We will treat your information with respect. For more information about our privacy practices please visit our website. By clicking below, you agree that we may process your information in accordance with these terms. We use MailChimp as our marketing automation platform. By clicking yes, you acknowledge that the information you provide will be transferred to MailChimp for processing in accordance with their Privacy Policy and Terms.