研究领域

Analytical

Our research aims at determining, understanding, and quantifying chemical processes in the atmosphere. For this purpose, state-of-the-art analytical instruments are developed and deployed to study the underlying chemical reactions of gas-phase species, both under controlled conditions in the laboratory as well as directly in the atmosphere. Of specific interest are processes that lead to formation and loss of ozone and its precursors from the atmosphere. Questions of relevance from an environmental point of view are being investigated using analytical, physical, and atmospheric chemistry techniques.

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T.W. Tokarek, D. K. Brownsey, N. Jordan, N.M. Garner, C.Z. Ye, F.V. Assad, A. Peace, C.L. Schiller, R.H. Mason, R. Vingarzan, and H.D. Osthoff (2017)"Biogenic emissions and nocturnal ozone depletion events at the Amphitrite Point Observatory on Vancouver Island" Atmosphere-Ocean, accepted Feb 21, 2017. L.H. Mielke, A. Furgeson, C.A. Odame-Ankrah, and H.D. Osthoff (2016)"Ubiquity of ClNO2 in the urban boundary layer of Calgary, AB, Canada" Can. J. Chem. 94(4), 414-423, doi: 10.1139/cjc-2015-0426. N.D. Rider, Y.M. Taha, C.A. Odame-Ankrah, J.A. Huo, T.W. Tokarek, E. Cairns, S.G. Mousa, J. Liggio, and H. D. Osthoff (2015)"Efficient photochemical generation of peroxycarboxylic nitric anhydrides with ultraviolet light emitting diodes"Atmos. Meas. Tech. 8, 2736-2748, doi: 10.5194/amt-8-2737-2015. R. Woodward-Massey, Y. M. Taha, S. G. Moussa, and H. D. Osthoff (2014)"Comparison of negative-ion proton-transfer with iodide ion chemical ionization mass spectrometry for quantification of isocyanic acid in ambient air"Atmos. Environm. 98, 693-703, doi: 10.1016/j.atmosenv.2014.09.014. T.W. Tokarek, J.A. Huo, C.A. Odame-Ankrah, D. Hammoud, Y.M. Taha, and H.D. Osthoff (2014)"A gas chromatograph for quantification of peroxycarboxylic nitric anhydrides calibrated by thermal dissociation cavity ring-down spectroscopy"Atmos. Meas. Tech. 7, 3263-3283, doi:10.5194/amt-7-3263-2014. L.H. Mielke, J. Stutz, C. Tsai, S.C. Hurlock, J.M. Roberts, P.R. Veres, K. D. Froyd, P.L. Hayes M. J. Cubison, J.L. Jimenez, R.A. Washenfelder, C.J. Young, J.B. Gilman, J.A. de Gouw, J.H. Flynn, N. Grossberg, B.L. Lefer, J. Liu, R.J. Weber, and H.D. Osthoff (2013)"Heterogeneous formation of nitryl chloride and its role as a nocturnal NOx reservoir species during CalNex-LA 2010"J. Geophys. Res.-Atmos. 118(18), 10,638–10,652, doi: 10.1002/jgrd.50783. Y.M. Taha, C.A. Odame Ankrah, and H.D. Osthoff (2013)"Real-time vapor detection of nitroaromatic explosives by catalytic thermal dissociation blue diode laser cavity ring-down spectroscopy"Chem. Phys. Lett. 582, 15-20, doi: 10.1016/j.cplett.2013.07.040. O. Abida and H.D. Osthoff (2012)"Parahalogenated Phenols Accelerate the Photochemical Release of Nitrogen Oxides from Frozen Solutions Containing Nitrate"J. Phys. Chem. A 116(24), 5923–5931, doi: 10.1021/jp210249t. L.H. Mielke and H.D. Osthoff (2012)"On quantitative measurements of peroxycarboxylic nitric anhydride mixing ratios by thermal dissociation chemical ionization mass spectrometry" Internat. J. Mass Spec. 310, 1-9, doi: 10.1016/j.ijms.2011.10.005. L.H. Mielke, A. Furgeson, and H.D. Osthoff (2011)"Observation of ClNO2 in a mid-continental urban environment"Environm. Sci. Technol. 45(20), 8889–8896, doi: 10.1021/es201955u. C. Odame-Ankrah and H.D. Osthoff (2011)"A compact diode laser cavity ring-down spectrometer for atmospheric measurements of NO3 and N2O5 with automated zeroing and calibration"Appl. Spectrosc. 65(11), 1260-1268, doi: 10.1366/11-06384. Alternative link: http://www.opticsinfobase.org/abstract.cfm?uri=as-65-11-1260.