Spectroscopic analysis of the excitation transfer from background air to diffusing aluminum laser produced plasma

Journal Article · Wed Apr 15 00:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3116186· OSTI ID:21357548

Ribiere, M; Cheron, B G ^[1]; Karabourniotis, D ^[2]

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1. Coria UMR 6614, CNRS, Avenue de l'Universite, 76801 Saint Etienne du Rouvray (France)
2. Department of Physics, Institute of Plasma Physics, University of Crete, 71003 Heraklion (Greece)

During the relaxation of the plasma plume generated by laser ablation of an aluminum target, a pronounced intensity enhancement is observed at the central wavelength of the 396.15 nm self-reversed resonant line. This spectral special feature is analyzed and related to the interaction of the plasma edge with the background air excited by the shockwave, prompt electrons, and extreme ultraviolet radiation produced at the earliest times of the ablation. In this article, the electron density, the aluminum ground state, and resonant level populations are determined from the fitting of the 396.15 nm calculated line profile to the experimental one at two background pressures (100 and 1000 Pa). The evolution of these densities is derived from experiments performed at delays, after the laser pulse arrival, ranging from 120 to 180 ns.

• OSTI ID: 21357548
• Journal Information: Journal of Applied Physics, Vol. 105, Issue 8; Other Information: DOI: 10.1063/1.3116186; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABLATION
AIR
ALUMINIUM
BOUNDARY LAYERS
ELECTRON DENSITY
EXCITATION
EXTREME ULTRAVIOLET RADIATION
GROUND STATES
LASER-PRODUCED PLASMA
LASERS
PLASMA PRODUCTION
PROMPT ELECTRONS
PULSES
SHOCK WAVES
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
FERMIONS
FLUIDS
GASES
LAYERS
LEPTONS
METALS
PLASMA
RADIATIONS
ULTRAVIOLET RADIATION