Carbon Nanotube Formation: C 2 Swan Band Emissions For Various Ablation Laser Combinations
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Carbon Nanotube Formation:
C2 Swan Band EmissionsFor Various Ablation Laser Combinations
Carmen RangeLeTourneau University
Longview, TX
NASA Johnson Space CenterThermal Branch
Structures and Mechanics DivisionEngineering Directorate
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Increase Production of Carbon Nanotubes
Understand the chemical mechanism
modify current methods or design new methods
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Laser Ablation
target
tube
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Previous Work
Laser Sample
Optics
Detector
Based on Laser Induced Fluorescence
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C2 LIF
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Previous ResultsC2 LIF
473.0 473.1 473.2 473.3 473.4 473.5 473.6 473.7 473.8
Wavelength (nm)
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Previous ResultsNi LIF
225.0 225.2 225.4 225.6 225.8 226.0
wavelength (nm)
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Experimental Setup
Ablation LasersGraphiteTarget
Various combinations involving 3 ablation lasers
Emission Collected by a Fiber Optic
Monochromator disperses emmision onto an ICCD
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' = 0
1
2
' = 0
1
2
3
4
20023 cm-1
0 cm-1
C2 Energy Levels
d3g
a3u
X1u+
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Vibrational BandsVibrational Bands
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Vibrational Bands
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Δv = 0Δv = 0
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Baseline Variations
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Baseline VariationsBaseline Variations
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File Lasers Modified Fit Unmodified Fit00jan21e IR Gr Gr 9600 K 9600 K
00jan6e Gr Gr IR 9600 K 9600 K
99dec20e IR Gr IR 8800 K 8800 K
99dec22f IR IR Gr 8600 K 8800 K
00jan21h IR Gr Gr 8000 K 8300 K
00jan6h Gr Gr IR 7600 K 8100 K
99dec22h IR IR Gr 7900 K 8000 K
00jan6g Gr Gr IR 7800 K 8000 K
00jan21g IR Gr Gr 7800 K 7900 K
99dec22i IR IR GR 7800 K 7900 K
99dec20g IR Gr IR 7700 K 7800 K
99dec20h IR Gr IR 7600 K 7700 K
Baseline Variations
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Trends in TemperatureTrends in Temperature
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Trends in Temperature
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Temperature FitsTemperature Fits
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Temperature FitsTemperature Fits
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File Lasers Delay Slit Width Ratio of Δv = 1 & 0
Ratio of Δv = 1 & -1
00jan21e IR Gr Gr 1500 100 9600 K 6500 K
00jan6e Gr Gr IR 1500 100 9600 K 6300 K
99dec20e IR Gr IR 1500 100 8800 K 6000 K
99dec22f IR IR Gr 1500 100 8800 K 5900 K
00jan21h IR Gr Gr 5000 500 8300 K 5900 K
00jan6h Gr Gr IR 5000 500 8100 K 5900 K
00jan6g Gr Gr IR 5000 100 8000 K 6200 K
99dec22h IR IR Gr 5000 100 8000 K 6400 K
00jan21g IR Gr Gr 5000 100 7900 K 6200 K
99dec22i IR IR Gr 5000 500 7900 K 5800 K
99dec20g IR Gr IR 5000 100 7800 K 6000 K
99dec20h IR Gr IR 5000 500 7700 K 5800 K
Temperature Fits
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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.
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Future Work
• Further analysis of the 3 laser spectra.
• Analysis of data from Parametric Studies.
• Computational modeling for:– nanotube behavior and properties
– molecular intermediates
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Acknowledgement
Carl ScottSivaram ArepalliWilliam HolmesPasha Nikolaev
Brad Files
SFF NASA-ASEE