tdma: Tandem Differential Mobility Analyzer

The Tandem Differential Mobility Analyzer (TDMA) measures aerosol dry-size distribution and size-resolved hygroscopic growth.

In its standard operating mode, dry aerosols are separated into size bins by the first differential mobility analyzer and then exposed to 85% relative humidity. The resulting hygroscopic growth distributions are then scanned by the second differential mobility analyzer for each dry-size bin.


  • Fixed
  • AMF1
  • AMF2
  • AMF3

Related Publications


Chen H, A Hodshire, J Ortega, J Greenberg, P McMurry, A Carlton, J Pierce, D Hanson, and J Smith. 2017. "Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site." Atmospheric Chemistry and Physics, 18(1), doi:10.5194/acp-18-311-2018.
Research Highlight

Mahish M and D Collins. 2017. "Analysis of a Multi-Year Record of Size-Resolved Hygroscopicity Measurements from a Rural Site in the U.S." Aerosol and Air Quality Research, 17(6), 10.4209/aaqr.2016.10.0443.


Collins D. 2010. Tandem Differential Mobility Analyzer/Aerodynamic Particle Sizer (APS) Handbook. DOE/SC-ARM-TR-090.

Voyles JW. 2010. ARM Climate Research Facility Monthly Instrument Report. DOE ARM Climate Research Facility. DOE/SC-ARM-10-006.5.

Voyles JW. 2010. ARM Climate Research Facility Monthly Instrument Report. DOE ARM Climate Research Facility. DOE/SC-ARM-10-006.9.

Stolzenburg MR and PH McMurry. 2010. "Equations governing single and tandem DMA configurations and a new lognormal approximation to the transfer function." Aerosol Science and Technology, 42(6), 10.1080/02786820802157823.


Martin ST, T Rosenoern, Q Chen, and DR Collins. 2008. "Phase changes of ambient particles in the Southern Great Plains of Oklahoma." Geophysical Research Letters, 35(22), L22801, 10.1029/2008gl035650.


Kulkarni P and J Wang. 2006. "New fast integrated mobility spectrometer for real-time measurement of aerosol size distribution: II. Design, calibration, and performance characterization." Journal of Aerosol Science, 37(10), 10.1016/j.jaerosci.2006.01.010.

Andrews E, PJ Sheridan, M Fiebeg, A McComiskey, JA Ogren, WP Arnott, D Covert, R Elleman, R Gasparini, D Collins, H Jonsson, B Schmid, and J Wang. 2006. "Comparison of methods for deriving aerosol asymmetry parameter." Journal of Geophysical Research – Atmospheres, 111(D5), 10.1029/2004jd005734.

Gasparini R, R Li, D Collins, RA Ferrare, and V Brackett. 2006. "Application of aerosol hygroscopicity measured at the Atmospheric Radiation Measurement Program's Southern Great Plains site to examine composition and evolution." Journal of Geophysical Research – Atmospheres, 111(D5), 10.1029/2004jd005448.

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