AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Measurement of Gas and Aerosol Phase Absorption Spectra across the Visible and Near-IR Using Supercontinuum Photoacoustic Spectroscopy
James Radney, CHRISTOPHER ZANGMEISTER, National Institute of Standards and Technology
Abstract Number: 444 Working Group: Instrumentation and Methods
Abstract We demonstrate a new method to measure the absorption spectra of gas and aerosol species across the visible and near-IR (500 nm to 840 nm) using a photoacoustic spectrometer (PA) and a pulsed supercontinuum laser source. Gas phases absorption spectra were demonstrated using H2O(g) as a function of relative humidity (RH). The measured absorption intensities and peak shapes were able to be quantified and compared to spectra calculated using the HITRAN2012 database. Size and mass selected nigrosin aerosol was used to measure absorption spectra acoss the visible and near-IR. Spectra were measured as a function of aerosol size/mass and show good agreement to Mie theory calculations. Lastly, we measured a broadband spectrum of aerosol as a function of RH using flame generated soot. The data illustrate the utility of using a broadband pulsed laser source for the measurement of aerosol absorption data.