Education: Ph.D. California Institute of Technology 2002-2006 Postdoctoral Fellow - Harvard University 2007-2010 Biography: Marcelo I. Guzman is an Assistant Professor of Chemistry in the University of Kentucky, where he teaches analytical and environmental chemistry courses. In 2013, he received a NSF CAREER award. He earned his Ph.D. at the California Institute of Technology (Caltech, 2006) working with Michael R. Hoffmann. In 2002, he was an Andrew W. Mellon Fellow at the Metropolitan Museum of Art (New York) working on Paper and Photograph Conservation in the Sherman Fairchild Center. For his postdoctoral experience he joined the Origins of Life Initiative and the Environmental Chemistry Group at Harvard University working with Scot T. Martin as an Origins Fellow.

The Guzman laboratory studies the photochemistry of small organic compounds present in low water activity environments such as the atmospheric aerosol, clouds and fogs. Mechanistic studies explore reactions of dissolved organic matter within aqueous aerosol mimics. The laboratory applies soft ionization methods coupled to mass spectrometry to explore the fast oxidation of halides and phenols at the air-water interface. We are also interested on the potential use of photocatalysis for fuel production and to jumpstart a prebiotic chemical cycle related to the origin of life. Learn more about our work at the group website: http://www.guzmanlab.com/research

Secondary Organic Aerosol (SOA) Formation from β-pinene + NO3 System: Effects of Humidity and Peroxy Radical Fate. C.M. Boyd, J. Sanchez, L. Xu, A.J. Eugene, T. Nah, W.-Y. Tuet, M.I. Guzman, and N.L. Ng. Atmospheric Chemistry and Physics Discussions (2015), 15, 2679–2744. PDF

Catechol oxidation by ozone and hydroxyl radicals at the air-water interface. E.A. Pillar, R.C. Camm, and M.I. Guzman*. Environmental Science & Technology (2014), 48, 14352-14360. PDF or PDF

CO2 Reduction under Periodic Illumination of ZnS. R.-X. Zhou and M.I. Guzman*. Journal of Physical Chemistry C (2014), 118, 11649-11656. PDF or PDF

A review of air-ice chemical and physical interactions (AICI): liquids, quasi-liquids, and solids in snow. T. Bartels-Rausch, H.-W. Jacobi, T.F. Kahan, J.L. Thomas, E.S. Thomson, J.P.D. Abbatt, M. Ammann, J.R. Blackford, H. Bluhm, C. Boxe, F. Domine, M.M. Frey, I. Gladich, M.I. Guzman, D. Heger, Th. Huthwelker, P. Klan, W.F. Kuhs, M.H. Kuo, S. Maus, S.G. Moussa, V.F. McNeill, J.T. Newberg, J.B.C. Pettersson, M. Roeselova, J.R. Sodeau. Atmospheric Chemistry and Physics (2014), 14, 1587-1633. PDF or PDF

Negative production of acetoin in the photochemistry of aqueous pyruvic acid. A.J. Eugene, S.-S. Xia, and M.I. Guzman*. Proceedings of the National Academy of Science of the United States of America (2013), 110, E4274-E4275. PDF or PDF

Conversion of iodide to hypoiodous acid and iodine in aqueous microdroplets exposed to ozone. E.A. Pillar, M.I. Guzman*, and J.M. Rodriguez. Environmental Science & Technology (2013), 47, 10971-10979. PDF

Organics in Environmental Ices: Sources, Chemistry, and Impacts. V.F. McNeill, A.M. Grannas, J.P.D. Abbatt, M. Ammann, P. Ariya, T. Bartels-Rausch, F. Domine, D.J. Donaldson, M.I. Guzman, D. Heger, T.F. Kahan, P. Klan, S. Masclin, C. Toubin, D. Voisin. Atmospheric Chemistry and Physics (2012), 12, 9653-9678. PDF

Chemisorption on Semiconductors: the Role of Quantum Corrections on the Space Charge Regions in Multiple Dimensions. F. Ciucci, C. de Falco, M.I. Guzman, S. Lee, and T. Honda. Applied Physics Letters (2012), 100, 183106. PDF

Concentration Effects and Ion Properties Controlling the Fractionation of Halides during Aerosol Formation. M.I. Guzman*, R.R. Athalye, and J.M. Rodriguez. Journal of Physical Chemistry A (2012), 116, 5428-5435. PDF

Abiotic Photosynthesis: From Prebiotic Chemistry to Metabolism. M.I. Guzman* in Origins of Life: The Primal Selforganization. R. Egel et al. (eds.), Springer Verlag, Berlin-Heidelberg (2011), pp 85-105, DOI 10.1007/978-3-642-21625-1_4, ISBN 978-3-642-21624-4.

Second-generation products contribute substantially to the particle-phase organic material produced by β-caryophyllene ozonolysis. Y.J. Li, Q. Chen, M.I. Guzman, C.K. Chan, and S.T. Martin. Atmospheric Chemistry and Physics (2011), 11, 121-132. PDF

From Prebiotic Chemistry to Metabolic Cycles. M.I. Guzman* in Astrobiology: From the Big Bang to Civilizations. G.A. Lemarchand and G.Tancredi (ed.), (2010), pp. 223-247. ISBN 978-92-9089-163-5. Montevideo, UNESCO. PDF

Photo-Production of Lactate from Glyoxylate: How Minerals Can Facilitate Energy Storage in a Prebiotic World. M.I. Guzman and S.T. Martin. Chemical Communications (2010), 46, 2265-2267, DOI:10.1039/b924179e. PDF

Thermochromism of Model Organic Aerosol Matter. A.G. Rincon, M.I. Guzman, M.R. Hoffmann, and A.J. Colussi. Journal of Physical Chemistry Letters (2010), 1, 368-373. PDF

Optical absorptivity versus molecular composition of model organic aerosol matter. A.G. Rincon, M.I. Guzman, M.R. Hoffmann, and A.J. Colussi. Journal of Physical Chemistry A (2009), 113, 10512-10520. PDF

Prebiotic Metabolism: Production by Mineral Photoelectrochemistry of α-Ketocarboxylic Acids in the Reductive Tricarboxylic Acid Cycle. M.I. Guzman and S.T. Martin. Astrobiology (2009), 9, 833-842. PDF

Synthesis of Pyrimidines and Triazines in Ice: Implications for the Prebiotic Chemistry of Nucleobases. C. Menor-Salván, M. Ruiz-Bermejo, M.I. Guzman, S. Osuna-Esteban, S. Veintemillas-Verdaguer. Chemistry-A European Journal (2009), 15, 4411-4418. PDF

Oxaloacetate-to-Malate Conversion by Mineral Photoelectrochemistry: Implications for the Viability of the Reductive Tricarboxylic Acid Cycle in Prebiotic Chemistry. M.I. Guzman and S.T. Martin. International Journal of Astrobiology (2008), 7, 271-278. PDF

An overview of snow photochemistry: evidence, mechanisms and impacts. A.M. Grannas, A.E. Jones, J. Dibb, M. Ammann, C. Anastasio, H. Beine, M. Bergin, J. Bottenheim, C.S. Boxe, G. Carver, J.H. Crawford, F. Domine, M.M. Frey, M.I. Guzman, D. Heard, D. Helmig, M.R. Hoffmann, R.E. Honrath, L.G. Huey, M. Hutterli, H.W. Jacobi, P. Klan, B. Lefer, J. McConnell, J. Plane, R. Sander, J. Savarino, P.B. Shepson, W.R. Simpson, J. Sodeau, R. von Glasgow, R. Weller, E.W. Wolff, T. Zhu. Atmospheric Chemistry and Physics (2007), 7, 4329-4373. PDF

Photolysis of Pyruvic Acid in Ice: Possible Relevance to CO and CO2 Ice Core Record Anomalies. Guzman M.I., M.R. Hoffmann, and A.J. Colussi. Journal of Geophysical Research (2007), 112, D10123, doi:10.1029/2006JD007886. PDF