The API-TOF is a flexible research platform for labs using unique ion source hardware

An atmospheric pressure interface (API) mass spectrometer designed for easy coupling to ion sources with operating pressures between 1 and 1000 mbar. Ready to use in the lab or field.

Advantages of API-TOF

  • Convenient, adaptable source-mounting flange – makes installation and interchange of sources fast and easy
  • Employs any of our TOF analyzers
  • Available as a research instrument or as an OEM component
  • 4 differential pumping stages between ion source and TOF with RF and DC focusing optics
  • Compact, robust assembly for bench-top or field applications, as shown in photo
  • Successfully adapted for many mobile laboratories, including: aircraft, research ships, trucks, and even a zeppelin
  • Ideal instrument for research groups developing novel ionization schemes

Example Ion Sources for API-TOF

  • Proton Transfer Reaction (Vocus PTR-TOF)
  • Extractive Electrospray Ionization (EESI)
  • Reduced Pressure or Atmospheric Pressure Chemical Ionization
  • Electrospray Ionization (ESI)
  • Direct Analysis in Real Time (DART,  Ionsense)
  • Dielectric Barrier Discharge (DBD)
  • Corona Discharge
  • X-Ray Ionization
  • Radionuclides

TOF Analyzer Performance Specifications

Ion Source Pressure1 to 1,000 mbar
Differential Pumping Stages1 to 3 mbar: Quadrupole 1
~1e-3 mbar: Quadrupole 2
~1e-5 mbar: Primary Beam Lens Stack
1e-6 mbar: TOF
Vacuum Pumps (excluding ion source)(1) Scroll Pump
(1) Turbo Pump
(1) Diagphram Pump
MassRack with HTOF: 85 kg
Rack with LTOF: 107 kg
Scroll Pump: 32 kg
Dimensions of Rack-Mounted SystemHTOF Version: 565 x 395 x 800 mm
LTOF Version: 615 x 480 x 1480 mm
Power Requirements (Excluding Source)100-240 VAC, 50-60 Hz, 2 kW

API-TOF Publications

2020

  1. Pagonis, D. et al. Airborne Extractive Electrospray Mass Spectrometry Measurements of the Chemical Composition of Organic Aerosol. Atmos. Meas. Tech. Discuss. in review, 2020. DOI: 10.5194/amt-2020-395
  2. Pospisilova, V. et al.  On the fate of oxygenated organic molecules in atmospheric aerosol particles.  Science Advances, 2020. In Focus | DOI: 10.1126/sciadv.aax8922

2019

  1. Stamatios, G. et al. Real-Time Detection of Aerosol Metals Using Online Extractive Electrospray Ionization Mass Spectrometry. Analytical Chemistry, 2019. DOI: 10.1021/acs.analchem.9b04480
  2. Stefenelli, G.; Pospisilova, V.; Lopez-Hilfiker, F.; Daellenbach, K.; Hüglin, Yandong TongC.;  Baltensperger, U.; Prévôt, A.; Slowik, J. Organic aerosol source apportionment in Zurich using an extractive electrospray ionization time-of-flight mass spectrometer (EESI-TOF-MS) – Part 1: Biogenic influences and day–night chemistry in summer. Atmospheric Chemistry and Physics, 2019. DOI: 10.5194/acp-19-14825-2019
  3. Qi, L.; Chen, M.; Stefenelli, G.; Pospisilova, V.; Tong, Y.; Bertrand, A.; Hueglin, C.;  Ge, X.; Baltensperger, U.;   Prévôt, A.; Slowik, J. Organic aerosol source apportionment in Zurich using an extractive electrospray ionization time-of-flight mass spectrometer (EESI-TOF-MS) – Part 2: Biomass burning influences in winter. Atmospheric Chemistry and Physics, 2019DOI: 10.5194/acp-19-8037-2019
  4. F. Lopez-Hilfiker et al. An Extractive Electrospray Ionization Time-of-Flight Mass Spectrometer (EESI-TOF) for online measurement of atmospheric aerosol particles, Atmos. Meas. Tech. Discuss.,  2019. DOI: 10.5194/amt-12-4867-2019

2016

  1. F. Bianchi et al. New particle formation in the free troposphere: A question of chemistry and timing.  Science, 2016. DOI: 10.1126/science.aad5456
  2.  J. Kirkby et al. Ion-induced nucleation of pure biogenic particles. Nature, 2016. DOI:10.1038/nature17953
  3. J. Tröstl et al. The role of low-volatility organic compounds in initial particle growth in the atmosphere. Nature, 2016. DOI:10.1038/nature18271

2014

  1. Neutral molecular cluster formation of sulfuric acid–dimethylamine observed in real time under atmospheric conditions, A. Kürten, et al., Proc. Natl. Acad. Sci. U.S.A., 111, 42, 15019–15024, 2014. DOI: 10.1073/pnas.1404853111
  2. A large source of low-volatility secondary organic aerosol, Ehn, M. et al, Nature 506, 476–479, 2014. DOI:10.1038/nature13032

2013

  1. Molecular understanding of atmospheric particle formation from sulfuric acid and large oxidized organic molecules, S. Schobesberger, et al., Proc. Natl. Acad. Sci. U.S.A., 110, 43, 17223–17228, 2013. DOI: 10.1073/pnas.1306973110

2011

  1. T. H. Bertram et al.  A field-deployable, chemical ionization time-of-flight mass spectrometer. Atmos. Meas. Tech., 2011. DOI: 10.5194/amt-4-1471-2011

2010

  1. H. Junninen et al. A high-resolution mass spectrometer to measure atmospheric ion composition.  Atmos. Meas. Tech., 2010. DOI: 10.5194/amt-3-1039-2010

*The API-TOF is a core component of the Aerodyne Research ToF-CIMS.   This field-portable chemical ionization mass spectrometer has been deployed for atmospheric measurements around the world.  Complete list of ToF-CIMS publications.

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