Chris Zangmeister

chrisz Supercontinuum Photoacoustic Spectroscopy

About the Presenter:

Chris Zangmeister studied sea salt aerosol and ice chemistry in Jeanne Pemberton’s group at the University of Arizona. In 2001 he became a National Research Postdoctoral Fellow at the National Institute of Standards at Technology in Gaithersburg, MD. In 2011 he became the Aerosol Metrology Program lead at NIST. The program focuses on developing new methods for measuring aerosol optical properties, assessing methods for particle classification and developing aerosol with known properties for future standards.

Full Presentation:

Abstract:

We have utilized a pulsed supercontinuum (SC) source coupled to a photoacoustic spectrometer (PAS) to measure absorption spectra across the visible and near-IR spectral regions. Using aerosol that is mobility diameter and mass selected allow the measurement of mass-specific absorption cross-sections across the complete spectrum. We will demonstrate the technique on nigrosin, fresh and hydrated flame generated soot, and engineered coated particles. The advantages of utilizing a short-pulse laser source for PAS data will be discussed.