Spatial Molecular AlO Temperature Distributions in Laser-Induced Plasma

Abstract

Spatially resolved, line-of-sight measurements of aluminum monoxide emission spectra in laser ablation plasma are used with Abel inversion techniques to extract radial plasma temperatures. Contour mapping of the radially deconvolved signal intensity shows a ring of AlO formation near the plasma boundary with the ambient atmosphere. Simulations of the molecular spectra were coupled with the line profile fitting routines. Temperature results are presented with simultaneous inferences from lateral, asymmetric radial, and symmetric radial AlO spectral intensity profiles. This analysis indicates that shockwave phenomena in the radial profiles, including a temperature drop behind the blast wave created during plasma initiation were measured.

Keywords

• molecular spectroscopy
• diatomic spectroscopy
• Abel transform
• plasma spectroscopy
• laser-induced breakdown spectroscopy
• laser-induced plasma
• plasma dynamics