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


Lu C, Y Liu, S Yum, J Chen, L Zhu, S Gao, Y Yin, X Jia, and Y Wang. 2020. "Reconciling Contrasting Relationships between Relative Dispersion and Volume‐Mean Radius of Cloud Droplet Size Distributions." Journal of Geophysical Research: Atmospheres, 125(9), e2019JD031868, 10.1029/2019JD031868.


Mohr C, J Thornton, A Heitto, F Lopez-Hilfiker, A Lutz, I Riipinen, J Hong, N Donahue, M Hallquist, T Petäjä, M Kulmala, and T Yli-Juuti. 2019. "Molecular identification of organic vapors driving atmospheric nanoparticle growth." Nature Communications, 10(1), 4442, 10.1038/s41467-019-12473-2.
Research Highlight

Rothfuss N, S Petters, W Champion, A Grieshop, and M Petters. 2019. "Characterization of a dimer preparation method for nanoscale organic aerosol." Aerosol Science and Technology, 53(9), 10.1080/02786826.2019.1623379.

Tandon A, N Rothfuss, and M Petters. 2019. "The effect of hydrophobic glassy organic material on the cloud condensation nuclei activity of particles with different morphologies." Atmospheric Chemistry and Physics, 19(5), 10.5194/acp-19-3325-2019.


Zheng G, Y Wang, A Aiken, F Gallo, M Jensen, P Kollias, C Kuang, E Luke, S Springston, J Uin, R Wood, and J Wang. 2018. "Marine boundary layer aerosol in the eastern North Atlantic: seasonal variations and key controlling processes." Atmospheric Chemistry and Physics, 18(23), doi:10.5194/acp-18-17615-2018.
Research Highlight

Petters M. 2018. "A language to simplify computation of differential mobility analyzer response functions." Aerosol Science and Technology, 52(12), 10.1080/02786826.2018.1530724.

Marsh A, S Petters, N Rothfuss, G Rovelli, Y Song, J Reid, and M Petters. 2018. "Amorphous phase state diagrams and viscosity of ternary aqueous organic/organic and inorganic/organic mixtures." Physical Chemistry Chemical Physics, 20(22), 10.1039/C8CP00760H.


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

Petters S, D Pagonis, M Claflin, E Levin, M Petters, P Ziemann, and S Kreidenweis. 2017. "Hygroscopicity of Organic Compounds as a Function of Carbon Chain Length and Carboxyl, Hydroperoxy, and Carbonyl Functional Groups." The Journal of Physical Chemistry A, 121(27), 10.1021/acs.jpca.7b04114.

Thalman R, S de Sá, B Palm, H Barbosa, M Pöhlker, M Alexander, J Brito, S Carbone, P Castillo, D Day, C Kuang, A Manzi, N Ng, A Sedlacek III, R Souza, S Springston, T Watson, C Pöhlker, U Pöschl, M Andreae, P Artaxo, J Jimenez, S Martin, and J Wang. 2017. "CCN activity and organic hygroscopicity of aerosols downwind of an urban region in central Amazonia: Seasonal and diel variations and impact of anthropogenic emissions." Atmospheric Chemistry and Physics, 17(9), 10.5194/acp-17-11779-2017.

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