Absorption and scattering characterization of airborne microparticulates by a cavity ringdown technique.
Nonresonant cavity ringdown laser absorption spectroscopy (CRLAS) was applied for detection and characterization of airborne particulates. Sensitive detection of a variety of aerosols under ambient conditions was achieved. The method provides, for the first time, time-resolved absolute aerosol concentration, with spatial resolution (along a line). The first report on absorption spectroscopy of monodispersed aerosols (in the size range 100-200 nm) is provided, and comparisons are made with the bulk data. The results indicate the possibility of applying CRLAS for selective analysis of aerosols. A new method for estimating the aerosol refraction index is also obtained from the ringdown data.
Bulatov
Valery
V
Department of Chemistry, Technion-Israel Institute of Technology, 32000, Haifa, Israel.
Chen
Yuheng
Y
Khalmanov
Aktam
A
Schechter
Israel
I