Time-resolved studies of the interactions between pulsed lasers and aerosols

被引：0

作者：

DeForest, Cindy L. ^{[1
]}

Qian, Jun ^{[1
]}

Miller, Roger E. ^{[1
]}

机构：

[1] Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290, United States

来源：

Applied Optics | 2002年 / 41卷 / 27期

关键词：

Aerosols - Evaporation - Fourier transform infrared spectroscopy - Laser pulses - Light scattering - Thermal expansion;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Studies of the interaction between a pulsed CO2laser 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.

引用

页码：5804 / 5813