Abstract
Studies of the interaction between a pulsed CO2 laser and micrometer-sized aqueous and organic particles by use of light-scattering methods and step-scan Fourier-transform infrared (FTIR) spectroscopy are reported. Visible two-color extinction experiments indicate primary particle shattering, accompanied by a high fraction of vaporization, followed by secondary particle evaporation. The extent of the latter depends on the pulse intensity and particle composition. Angle-resolved light-scattering investigations provide insight into the aerosol size distribution and temperature following the pulsed heating event. The time dependence of the vapor plume, monitored with step-scan FTIR spectroscopy, confirms that a large fraction of the initial particle is quickly evaporated during the shattering event, followed by secondary fragment evaporation and thermal expansion.
© 2002 Optical Society of America
Full Article | PDF ArticleMore Like This
Gerard P. Quigley, Robert B. Webster, Edward J. Caramana, Richard L. Morse, and George W. York
Appl. Opt. 30(21) 3041-3046 (1991)
S. C. Davies and James R. Brock
Appl. Opt. 26(5) 786-793 (1987)
Michael C. Fowler
Appl. Opt. 22(19) 2960-2964 (1983)