Alexander Laskin

laskin Chemical Imaging and Molecular Characterization of Atmospheric Aerosols

About the Presenter:

Alexander Laskin received his undergraduate (diploma) degree from the Polytechnical Institute, St. Petersburg, Russia, in 1991 in physics and his Ph.D. degree in physical chemistry from the Hebrew University of Jerusalem, in 1998. Following postdoctoral research appointments at the University of Delaware, Princeton University, and Pacific Northwest National Laboratory (PNNL), he became a staff scientist at PNNL in 2001. His present position at PNNL is a Senior Scientist (level V). He published over 120 research and review articles in the areas of the physical and analytical chemistry of aerosols, the environmental and atmospheric effects of aerosols, the chemical imaging and molecular level studies of aerosols, the micro spectroscopy and high-resolution mass spectrometry of aerosols, the study of combustion-related aerosols, combustion chemistry, and chemical kinetics.

Full Presentation:

Abstract:

Fundamental understanding of the complex chemistry of atmospheric aerosols, their physicochemical properties and environmental impacts is a challenging task because no single method of analytical chemistry is capable of providing the full range of analytical chemistry information. Electron microscopy and micro-spectroscopy approaches can visualize individual particles and their internal structures; however, they largely exclude molecular-level information, and are limited to elemental and chemical bonding characterization. Contemporary methods of high-resolution mass spectrometry can provide detailed information on the molecular content of organic aerosol, but these methods use bulk particle samples and provide no knowledge of the individual particle composition. Therefore, application of complementary analytical methods of chemical analysis is necessary for comprehensive characterization of aerosol properties ranging from bulk molecular composition of aerosol organic constituents to microscopy level details of individual particles. Combined assessment of the results provided by complementary analytical chemistry techniques offers unique insights to understand the composition and physico-chemical properties of aerosols determining their effects on air quality and climate. This presentation will give an overview of recent field and laboratory studies of atmospheric aerosols with an overall goal to understand fundamental relationship between chemical transformations of airborne particles and their environmental and climate impacts.