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

Journal Article · Tue Feb 20 00:00:00 EST 2007 · Applied Optics

DOI:https://doi.org/10.1364/AO.46.000959· OSTI ID:20929659

Michelsen, Hope A; Tivanski, Alexei V; Gilles, Mary K; Poppel, Laura H. van; Dansson, Mark A; Buseck, Peter R

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 above0.12 J/cm2 at532 nm and0.22 J/cm2 at1064 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.

• OSTI ID: 20929659
• Journal Information: Applied Optics, Vol. 46, Issue 6; Other Information: DOI: 10.1364/AO.46.000959; (c) 2007 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6935
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTROSCOPY
ATOMIC CLUSTERS
CARBON
EVAPORATION
FINE STRUCTURE
LASER RADIATION
LASERS
MICROSCOPES
NUCLEATION
OPTICAL MICROSCOPY
PARTICLE SIZE
PHOTOCHEMISTRY
SOOT
TRANSMISSION ELECTRON MICROSCOPY
X RADIATION
X-RAY SPECTROSCOPY