About the Project
Chemical ionization with high-resolution time-of-flight mass spectrometry can now provide sensitive, real-time identification and quantification of a large number of gas-phase compounds in sampled air. Chemical ionisation provides selective detection based on the employed reagent ion chemistry and new orthogonal extraction time of flight mass spectrometers provide very sensitive detection systems. A number of these instruments are now in operation and are being used to sample atmospheric concentrations of a wide range of compounds. An instrument at the forefront of such developments is the Aerodyne Inc. CI-ToFMS which is being developed and used by a number of research groups world-wide, including Manchester. Our instrument is coupled to an inlet that can sample gas directly from the atmosphere while at the same time collecting particulate which is subsequently analysed by thermal ramping and backflushing the evolved gas into the mass spectrometer. We are widely using this instrument in laboratory, ground based field, and airborne studies.
In addition, we are seeking to expand our mass spectrometric capability with the addition of an extractive electrospray ionization source to our ToF-MS. This source offers molecular ion formation for a wide range of organic compounds in particulate with very little fragmentation.
The successful PhD student will utilise these instrumental techniques. They will develop further calibration and identification methodologies and will be involved in chamber studies, field experiments and airborne measurements. The focus will be to develop our understanding of organic molecules in the atmosphere through these combined approaches.
Yatavelli,R.L.N., Lopez-Hilfiker, F., Wargo, J.D., Kimmel, J.R., Cubison, M.J., Bertram, T.H., Jimenez, J.L.,
Gonin,M., Worsnop, D.R., and Thornton, J.A., A Chemical Ionization High-Resolution Time-of-Flight Mass
Spectrometer Coupled to a Micro Orifice Volatilization Impactor (MOVI-HRToF-CIMS) for Analysis of Gas and
Particle-Phase Organic Species, Aerosol Science and Technology, 46:1313–1327, 2012, DOI: 10.1080/02786826.2012.712236
Gallimore, P. J., Giorio, C., Mahon, B. M., and Kalberer, M.: Online molecular characterisation of organic aerosols in an atmospheric chamber using extractive electrospray ionisation mass spectrometry, Atmos. Chem. Phys., 17, 14485–14500, https://doi.org/10.5194/acp-17-14485-2017, 2017.
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