CN and C2 Spectroscopy on the Pulsed Ablation of Graphite in the Visible Spectrum
Abstract
An experimental study was conducted on the nanosecond pulsed laser ablation of graphite using a KrF laser at a fluence of 3.8 J/sq cm 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2020
- Accession Number
- AD1109191
Entities
People
- Brandon A. Pierce
Organizations
- Air Force Institute of Technology