Date of Award
Master of Science
Department of Engineering Physics
Kevin Gross, PhD
An experimental study was conducted on the nanosecond pulsed laser ablation of graphite using a KrF laser at a fluence of 3.8 J/cm2 in Air, Ar, He, and N2. Optical emissions spectroscopy revealed the C2 Swan sequences and the CN Violet sequences. A spectroscopic model was developed to extract the molecular rotational and vibrational temperatures of each excited species for t=0.5-10 microseconds after laser irradiation. The rovibrational temperatures were found to vary with background gas for the CN Violet; however, only the vibrational temperature varied between He and the other background gases for C2 Swan. The rotational and vibrational temperatures were not in equilibrium for both the C2 Swan and CN Violet.
DTIC Accession Number
Pierce, Brandon A., "CN and C2 Spectroscopy on the Pulsed Ablation of Graphite in the Visible Spectrum" (2020). Theses and Dissertations. 3892.