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Kyle N. Crabtree, Carrie A. Kauffman, and Benjamin J. McCall 23 June 2009 McCall Research Group

Performance of a Continuous Supersonic Expansion Discharge Source Evaluated by Laser-Induced Fluorescence Spectroscopy. Kyle N. Crabtree, Carrie A. Kauffman, and Benjamin J. McCall 23 June 2009 McCall Research Group University of Illinois http://bjm.scs.uiuc.edu. Overview . Intro/Motivation

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Kyle N. Crabtree, Carrie A. Kauffman, and Benjamin J. McCall 23 June 2009 McCall Research Group

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  1. Performance of a Continuous Supersonic Expansion Discharge Source Evaluated by Laser-Induced Fluorescence Spectroscopy Kyle N. Crabtree, Carrie A. Kauffman, and Benjamin J. McCall 23 June 2009 McCall Research Group University of Illinois http://bjm.scs.uiuc.edu http://bjm.scs.uiuc.edu

  2. Overview • Intro/Motivation • Experimental Layout • Spectroscopic Efforts • Current Measurements http://bjm.scs.uiuc.edu

  3. Supersonic Expansion Discharge Source Operational lifetime: >100 hrs Typical Voltage: 200-500 V Typical Current: ~30 mA Typical Pressure: 1-3 atm http://bjm.scs.uiuc.edu

  4. Source Optimization • Pressure • Composition • Diameters • Lengths • Diameter Ratio • Voltage/Current • Polarity • Size • Geometry • Material • Size • Geometry http://bjm.scs.uiuc.edu

  5. LIF Spectroscopy • Generate 2D map of ion temperature and relative density • Optimize spectrometer using I2 • Make map using N2+ • Vary source parameters, and repeat • Investigate larger, more complex ions http://bjm.scs.uiuc.edu

  6. Overview • Intro/Motivation • Experimental Layout • Spectroscopic Efforts • Current Measurements http://bjm.scs.uiuc.edu

  7. Experimental Layout High-Voltage Power Supply DAQ Computer N2 PMT I2 Optical Filter(s) Lock-in Amplifier Laser Locking/ Scanning Electronics I2 Cell λ- meter 899-29 Ring Dye Laser Nd:YVO4 Optical Chopper http://bjm.scs.uiuc.edu

  8. Vernier Etalons Laser Power I2 Cell Absorption Scan Drive Long & Short Vernier Etalons Thin Etalon CFN899 Autoscan http://bjm.scs.uiuc.edu

  9. Overview • Intro/Motivation • Experimental Layout • Spectroscopic Efforts • Current Measurements http://bjm.scs.uiuc.edu

  10. Molecular Iodine • B3Π0+u – X1Σg+ (6-0), (8-1), (10-2), and (12-3) vibronic transitions at 608 nm Sample Spectrum Here Boltzmann Plot Here ) http://bjm.scs.uiuc.edu

  11. N2+ • A2Πu – X2Σg+ (4-0) Meinel Band transition (614 nm) • LIF characterization by T.A. Miller et al. in 1984 2Π3/2 2Π1/2 T.A. Miller, T. Suzuki, E. Hirota J. Chem. Phys. 80, (1984) 4671-4678. http://bjm.scs.uiuc.edu

  12. Source Emission http://bjm.scs.uiuc.edu

  13. Overview • Intro/Motivation • Experimental Layout • Spectroscopic Efforts • Current Measurements http://bjm.scs.uiuc.edu

  14. 500 E(cm-1) J 3 2 1 0 0 K 0 1 2 3 Spectroscopy of H3+(ν2 0) R(1,0) R(1,1) R(2,1) R(3,3) R(2,2) 315 cm-1 237 cm-1 169 cm-1 87 cm-1 64 cm-1 (ortho) (para) (para) (ortho) http://bjm.scs.uiuc.edu

  15. Difference Frequency Laser MgO-doped PPLN crystal Spectral Coverage: 2.2 – 4.8 μm Power: ~350 μW 1 1 2 2 http://bjm.scs.uiuc.edu

  16. Summary/Future Directions • Design and construction of source • Iodine rotational temperature: 8 K • Cavity ringdown spectroscopy of H3+ with difference frequency laser • Future work: temperature measurements of larger ions • Integration with SCRIBES http://bjm.scs.uiuc.edu

  17. Acknowledgements • University of Illinois SCS Machine Shop • Bill Knight • Christopher Neese • McCall Research Group http://bjm.scs.uiuc.edu

  18. Cavity Ringdown Spectroscopy http://bjm.scs.uiuc.edu

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