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Carbon Nanotube Formation: C 2 Swan Band Emissions For Various Ablation Laser Combinations

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: C 2 Swan Band Emissions For Various Ablation Laser Combinations

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  1. 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

  2. Increase Production of Carbon Nanotubes modify current methods or design new methods Understand the chemical mechanism

  3. Laser Ablation target tube

  4. Previous Work Based on Laser Induced Fluorescence Detector Optics Laser Sample

  5. C2 LIF

  6. Previous Results C2 LIF

  7. Previous Results Ni LIF

  8. Experimental Setup Monochromator disperses emmision onto an ICCD Emission Collected by a Fiber Optic Ablation Lasers Graphite Target Various combinations involving 3 ablation lasers

  9. d3Pg a3Pu X1Su+

  10. Vibrational Bands Vibrational Bands

  11. Vibrational Bands

  12. Δv = 0 Δv = 0

  13. Baseline Variations

  14. Baseline Variations Baseline Variations

  15. Baseline Variations

  16. Trends in Temperature Trends in Temperature

  17. Trends in Temperature

  18. Temperature Fits Temperature Fits

  19. Temperature Fits Temperature Fits

  20. Temperature Fits

  21. 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.

  22. Future Work • Further analysis of the 3 laser spectra. • Analysis of data from Parametric Studies. • Computational modeling for: • nanotube behavior and properties • molecular intermediates

  23. Acknowledgement Carl ScottSivaram ArepalliWilliam HolmesPasha NikolaevBrad FilesSFF NASA-ASEE

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