Aluminum Monoxide Emission Measurements in a Laser-Induced Plasma

Abstract

We report temperature inferences from time-resolved emission spectra of a micro-sized plasma following laser ablation of an aluminum sample. The laser-induced breakdown event is created with the use of nanosecond pulsed laser radiation. Plasma temperatures are inferred from the aluminum monoxide spectroscopic emissions of the aluminum sample by fitting experimental to theoretically calculated spectra with a nonlinear fitting algorithm. The synthetic spectra used as a comparison for the experimental spectra are generated from accurate line strengths of aluminum monoxide bands. The inferred plasma temperatures are found to be 5315 ± 100 K at 20 μs following breakdown. At later time delays of 45 and 70 μs following breakdown, the plasma temperatures are found to be 4875 ± 95 and 4390 ± 80 K, respectively. Error analysis of the inferred temperatures is performed with the fitting algorithm.

Atomic and molecular LIBS spectra of Al alloys and composite materials for nanosecond and microsecond excitation

“…6. The results are in reasonable accordance with the data presented in [5]. Analyses were performed for three samples of unknown composites, called in the text conventionally according to their colors.…”

Spatial Molecular AlO Temperature Distributions in Laser-Induced Plasma

“…The term S ul is the diatomic line strength and is calculated in a factorized form to account for electronic, vibrational, and rotational molecular structure. Detailed procedures for calculating a spectrum from the diatomic line strength are outlined in References [20][21][22]. Given the temperature dependence of the molecular spectrum, a fitting routine was used to extract the temperature of each temporally and spatially resolved AlO spectrum.…”

Spatial Molecular AlO Temperature Distributions in Laser-Induced Plasma

“…The term S ul is the diatomic line strength and is calculated in a factorized form to account for electronic, vibrational, and rotational molecular structure. Detailed procedures for calculating a spectrum from the diatomic line strength are outlined in References [20][21][22].…”