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Carbon Nanotube Formation: C 2 Swan Band Emissions For Various Ablation Laser Combinations Carmen Range LeTourneau University Longview, TX NASA Johnson Space Center Thermal Branch Structures and Mechanics Division Engineering Directorate. Increase Production of Carbon Nanotubes.
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Carbon Nanotube Formation: C2 Swan Band Emissions For Various Ablation Laser Combinations Carmen Range LeTourneau University Longview, TX NASA Johnson Space Center Thermal Branch Structures and Mechanics Division Engineering Directorate
Increase Production of Carbon Nanotubes modify current methods or design new methods Understand the chemical mechanism
Laser Ablation target tube
Previous Work Based on Laser Induced Fluorescence Detector Optics Laser Sample
Previous Results C2 LIF
Previous Results Ni LIF
Experimental Setup Monochromator disperses emmision onto an ICCD Emission Collected by a Fiber Optic Ablation Lasers Graphite Target Various combinations involving 3 ablation lasers
d3Pg a3Pu X1Su+
Vibrational Bands Vibrational Bands
Δv = 0 Δv = 0
Baseline Variations Baseline Variations
Trends in Temperature Trends in Temperature
Temperature Fits Temperature Fits
Temperature Fits Temperature Fits
Conclusions • Different ablation laser combinations result in different C2 emmission spectra. • Shorter wavelength lasers result in spectra with greater intensity and warmer temperatures. • Fitting is complicated by a broad underlying contribution of uncertain origin. • Spectra does not appear to fit well to a single temperature.
Future Work • Further analysis of the 3 laser spectra. • Analysis of data from Parametric Studies. • Computational modeling for: • nanotube behavior and properties • molecular intermediates
Acknowledgement Carl ScottSivaram ArepalliWilliam HolmesPasha NikolaevBrad FilesSFF NASA-ASEE