Evolution and imaging of nanoparticles observed in laser ablated carbon plume

Journal Article · Tue Sep 15 00:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3224871· OSTI ID:21361848

Yadav, Dheerendra; Gupta, Varun; Thareja, Raj K ^[1]

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1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016 (UP) (India)

We report evidence of nanoparticles formation in laser ablated carbon plasma created by irradiating a graphite target with nanosecond neodymium doped yttrium aluminum garnet laser. The temporal evolution and spatial distribution of C{sub 2} molecules in the plasma is studied using optical emission spectroscopy, dynamic imaging and laser induced fluorescence techniques. The laser induced fluorescence spectrum and imaging of C{sub 2} fluorescence corresponding to transition d {sup 3}PI{sub g}-a {sup 3}PI{sub u} (0, 1) (lambda=563.5 nm) is investigated by probing the expanding plume using a dye laser. The temporal evolution of ground state number density of C{sub 2} shows density varying from 2.6x10{sup 20}/m{sup 3} to 1.2x10{sup 22}/m{sup 3} on varying delay between the ablating and probe pulse from 200 to 600 ns. A peculiar bifurcation of carbon plume into two parts at approx270 ns after the formation of plasma is attributed to recombination of carbon species and formation of nanoparticles. This study may help in quantitatively understanding of formation of carbon molecular species and the nanoparticles produced in laser ablated carbon plume.

• OSTI ID: 21361848
• Journal Information: Journal of Applied Physics, Vol. 106, Issue 6; Other Information: DOI: 10.1063/1.3224871; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ABLATION
ALUMINIUM COMPOUNDS
BIFURCATION
DOPED MATERIALS
DYE LASERS
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
GARNETS
GRAPHITE
GROUND STATES
NANOSTRUCTURES
NEODYMIUM
PARTICLES
PLASMA
PLASMA DIAGNOSTICS
PLASMA PRODUCTION
PLUMES
RECOMBINATION
SPATIAL DISTRIBUTION
YTTRIUM COMPOUNDS
CARBON
DISTRIBUTION
ELEMENTS
EMISSION
EMISSION SPECTROSCOPY
ENERGY LEVELS
LASERS
LIQUID LASERS
LUMINESCENCE
MATERIALS
METALS
MINERALS
NONMETALS
PHOTON EMISSION
RARE EARTHS
SILICATE MINERALS
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS