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Optical emission spectroscopy of oxygen plasma induced by IR CO2 pulsed laser

AuthorsCamacho, J. J.; Santos, M. ; Díaz Sol, Luis ; Poyato, J. M. L.
Issue Date2008
PublisherInstitute of Physics Publishing
CitationJournal of Physics D - Applied Physics 41: 215206 (2008)
AbstractLaser-induced breakdown (LIB) spectroscopy in oxygen at room temperature and pressures ranging from 4.6 to 75 kPa was studied using a high-power transverse excitation atmospheric CO2 laser (λ = 9.621 and 10.591 νm; τFWHM = 64 ns; power densities ranging from 0.87 to 6.31 GW cm-2). The spectrum of the generated plasma is dominated by emission of strong O, O+ and weak O2+ atomic lines. Excitation temperatures of 31 500 1600 K and 23 000 3000 K were estimated by means of O2+ and O+ ionic lines, respectively. Electron number densities of the order of (3.5-16.5) × 1016 cm -3 were deduced from the Stark broadening of several ionic O + lines. The characteristics of the spectral emission intensities from different species have been investigated as functions of the oxygen pressure and laser irradiance. Optical breakdown threshold intensities in O 2 at 10.591 νm have been determined. The physical processes leading to LIB of oxygen have been analysed. © 2008 IOP Publishing Ltd.
Identifiersdoi: 10.1088/0022-3727/41/21/215206
issn: 0022-3727
Appears in Collections:(CFMAC-IEM) Artículos
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