AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Effects of Fluorescence Removal on the Raman Spectra of Single Atmospheric Aerosol Particles
DAVID DOUGHTY, Steven Hill, CCDC Army Research Laboratory
Abstract Number: 688 Working Group: Instrumentation and Methods
Abstract Raman spectroscopy can be used to provide information on the chemical composition of individual aerosol particles. Fluorescence can interfere with analysis of Raman spectra, and in some cases can completely obscure the Raman signal. Estimating and removing fluorescence from Raman spectra is a commonly used analysis technique. We show that for spectra with D/G Raman peaks, the individual-particle fluorescence spectra can vary greatly. These variations suggest differing fluorescent materials associated with different particles. We also illustrate the effects of different fluorescence removal algorithms on the peak locations of the D and G bands. The use of both fluorescence and Raman spectra may be especially helpful in individual particle analysis, where the particles are small (e.g., 200 nm) and the goals include measuring sufficient number of spectra to obtain time variations and useful statistics for ambient particles. That is, analysis of both fluorescence and Raman spectra may help in identifying more types of atmospheric particles.