The Grassian group is involved in several research areas including surface chemistry of environmental interfaces, heterogeneous atmospheric chemistry, climate impact of atmospheric aerosols, and environmental and health aspects of nanoscience and nanotechnology.
Scattering apparatus was developed in collaboration with Paul Kleiber and Mark Young to simultaneously measure the scattering phase function, linear polarization and particle size distribution of aerosols. The apparatus uses a broadly tunable-pulsed Nd:YAG-pumped optical parametric oscillator laser system as the visible light source. Scattered light is captured and focused by an elliptical mirror and CCD camera is used to simultaneously image the full angular scattering range. An in-line aerodynamic particle sizer (APS) and a scanning mobility particle sizer (SMPS) in the particle flow stream provide for the simultaneous measurement of the aerosol particle size distribution. This apparatus allows for a comparison of measured optical properties with theoretical model calculations based on the measured aerosol size distribution.