Particle formation from pulsed laser irradiation of soot aggregates studied with a scanning mobility particle sizer, a transmission electron microscope, and a scanning transmission x-ray microscope

Hope A. Michelsen, Alexei V. Tivanski, Mary K. Gilles, Laura H. Van Poppel, Mark A. Dansson, P R Buseck

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

We investigated the physical and chemical changes induced in soot aggregates exposed to laser radiation using a scanning mobility particle sizer, a transmission electron microscope, and a scanning transmission x-ray microscope to perform near-edge x-ray absorption fine structure spectroscopy. Laser-induced nanoparticle production was observed at fluences above 0.12 J/cm2 at 532 nm and 0.22 J/cm2 at 1064 nm. Our results indicate that new particle formation proceeds via (1) vaporization of small carbon clusters by thermal or photolytic mechanisms, followed by homogeneous nucleation, (2) heterogeneous nucleation of vaporized carbon clusters onto material ablated from primary particles, or (3) both processes.

Original languageEnglish (US)
Pages (from-to)959-977
Number of pages19
JournalApplied Optics
Volume46
Issue number6
DOIs
StatePublished - Feb 20 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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