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University of Minnesota

PTR-QiTOF & High-Sensitivity PTR-MS

Affiliation: University of Minnesota, USA
IONICON instruments: PTR-QiTOF & High-Sensitivity PTR-MS
Contact person: Dylan Millet, Associate Professor of Atmospheric Chemistry

“Why is an IONICON PTR-MS very well suited for your measurement tasks?”

Prof. Millet told us: "Our group uses Ionicon PTR-MS and PTR-QiTOF instruments to study the sources, chemistry, and impacts of atmospheric organic compounds across a diverse range of environments. We use these instruments because the combination of sensitivity, mass resolution, and fast time response provides an important toolset for our research."

Most relevant scientific papers and conference presentations:

Millet, D.B., M. Baasandorj, D.K. Farmer, J.A. Thornton, K. Baumann, P. Brophy, S. Chaliyakunnel, J.A. de Gouw, M. Graus, L. Hu, A. Koss, B.H. Lee, F.D. Lopez-Hilfiker, J.A. Neuman, F. Paulot, J. Peischl, I.B. Pollack, T.B. Ryerson, C. Warneke, B.J. Williams, and J. Xu (2015), A large and ubiquitous source of atmospheric formic acid, Atmos. Chem. Phys., 15, 6283-6304, doi:10.5194/acp-15-6283-2015.

Hu, L., D.B. Millet, M. Baasandorj, T.J. Griffis, P. Turner, D. Helmig, A.J. Curtis, and J. Hueber (2015), Isoprene emissions and impacts over an ecological transition region in the US Upper Midwest inferred from tall tower measurements, J. Geophys. Res., 120, 3553-3571, doi:10.1002/2014JD022732.

Hu, L., D.B. Millet, M. Baasandorj, T.J. Griffis, K.R. Travis, C.W. Tessum, J.D. Marshall, W.F. Reinhart, T. Mikoviny, M. Müller, A. Wisthaler, M. Graus, C. Warneke, and J. de Gouw (2015), Emissions of C6-C8 aromatic compounds in the United States: Constraints from tall tower and aircraft measurements, J. Geophys. Res., 120, 826-842, doi:10.1002/2014JD022627.

Baasandorj, M., D.B. Millet, L. Hu, D. Mitroo, and B.J. Williams (2015), Measuring acetic and formic acid by proton-transfer-reaction mass spectrometry: Sensitivity, humidity dependence, and quantifying interferences, Atmos. Meas. Tech., 8, 1301-1321.Hu, L., D.B. Millet, S.Y. Kim, K.C. Wells, T.J. Griffis, E.V. Fischer, D. Helmig, J. Hueber, and A.J. Curtis (2013), North American acetone sources determined from tall tower measurements and inverse modeling, Atmos. Chem. Phys., 13, 3379-3392.

Hu, L., D.B. Millet, M.J. Mohr, K.C. Wells, T.J. Griffis, and D. Helmig (2011), Sources and seasonality of atmospheric methanol based on tall tower measurements in the US Upper Midwest, Atmos. Chem. Phys., 11, 11145-11156.