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Time-resolved optical emission spectroscopy of laser-produced air plasma

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5 Author(s)
Camacho, J.J. ; Departamento de Química-Física Aplicada, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain ; Diaz, L. ; Santos, M. ; Juan, L.J.
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Time-resolved optical emission spectroscopy (OES) is used to analyze a mesh-initiated air breakdown plasma induced by a transverse excitation atmospheric CO2 pulsed laser (λ=10.591 μm, 64 ns (full width at half maximum), 70–160 J/cm2). Emission from excited N, O, C, H, and Ar; ionic fragment N+, O+, N2+, O2+, C+, and molecular band systems of N2+(B2Σu+-X2Σg+; D2Πg-A2Πu), N2(C3Πu-B3Πg), and OH(A2Σ+-X2Π) is observed. Plasma characteristics are examined in detail on the emission lines of N+, O+, and C by time-resolved OES technique. The results show a faster decay of continuum and ionic spectral species than of neutral atomic and molecular ones. The velocity and kinetic energy distributions for the different species were obtained from time-of-flight measurements. Excitation temperature and electron density in the laser-induced plas- - ma were estimated from the analysis of spectral data at various times from the laser pulse incidence. Temporal evolution of electron density has been used for the estimation of the three-body recombination rate constant.

Published in:

Journal of Applied Physics  (Volume:107 ,  Issue: 8 )

Date of Publication:

Apr 2010

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