Skip to main content

Open Access Two-Color Laser Induced Evaporation Dynamics of Liquid Aerosols Probed by Time-of-Flight Mass Spectrometry

Download Article:
 Download
(PDF)
 

Abstract:

The first results are reported from an investigation into the evapora tion dynamics of liquid aerosols using a newly constructed two color laser time-off light mass spectrometer, which utilizes a CO2 laser (IR) for vaporization and an excimer laser (UV) for ionization. The results indicate that the CO 2 laser with an intensity greater than 1.2 = 108 W cm2 completely vaporizes the aerosol particle and that this preevaporation of the liquid aniline particle increases the ion signal by as much as two orders of magnitude compared to direct ionization of the particle with the excimer laser only. The present focus is on exploring the vaporization process by varying both the timing between the two lasers and the CO 2 laser fluence. A three-dimensional (3D) model of the laser-induced gas plume is used to extract the associated velocity distribution and its temperature of 1300 and 2500 K for CO2 laser intensities of 1.2 = 108 W cm2 and 2.8 = 108 W cm2, respectively. At the higher CO2 laser energies, the data could only be fitted by the addition of a 350 m/s stream, or entrainment, velocity to the three-dimensional Maxwell-Boltzmann distribution, consistent with hydrodynamic expansion.

Document Type: Research Article

DOI: https://doi.org/10.1080/027868200410813

Affiliations: UNIVERSITY OF NORTH CAROLINA

Publication date: 2000-07-01

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more