Mr. Kyle N. Crabtree
Professional InformationGraduate Student: Analytical Chemistry |
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Current Research
My research in the McCall lab has been centered around developing components of the SCRIBES instrument. My first project was working with Andrew Mills to construct the difference frequency generation laser (DFG) that will be used with SCRIBES to acquire vibrational spectra of molecular ions. This laser was then used to characterize a pulsed supersonic expansion source used to determine the dissociative recombination rate of H3+.
After working with the difference frequency laser, I began developing a continuous supersonic expansion discharge source for the SCRIBES experiment. This source has proven to be a reliable source of ions; having operated in excess of 200 hours without failure, and I am currently working to assess the performance of this device.
To characterize the source, I built a second DFG as well as a new cavity ringdown spectrometer. The DFG consists of a MgO-doped periodicallly-poled LiNbO3 crystal pumped by a 532 nm Nd:YVO4 laser and a tunable cw dye laser, and it is capable of producing cw single-frequency light from 2.2-4.8 μm. I am using this laser together with the cavity ringdown spectrometer to measure the rotational temperature of H3+ ions in order to determine the cooling performance of the source, as well as to learn more about the H3+ + H2 chemical reaction.
Papers
| 1 | B. A. Tom, V. Zhaunerchyk, M. B. Wiczer, A. A. Mills, K. N. Crabtree, M. Kaminska, W. D. Geppert, M. Hamberg, M. af Ugglas, E. Vigren, W. J. van der Zande, M. Larsson, R. D. Thomas, and B. J. McCall "Dissociative Recombination of Highly Enriched Para-H3+" Journal of Chemical Physics (2009), 130, 031101. |
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Talks
| 9 | H. Kreckel, A. A. Mills, M. Perera, B. M. Siller, K. N. Crabtree, C. A. Kauffman and B. J. McCall "SCRIBES: Sensitive, Cooled, Resolved Ion-BEam Spectroscopy" Second Midwest Astrochemistry Meeting, University of Illinois, 2009. |
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| 8 | A. A. Mills, K. B. Ford, H. Kreckel, M. Perera, K. N. Crabtree and B. J. McCall "Indirect Terahertz Spectroscopy of Molecular Ions Using Highly Accurate and Precise Mid-IR Spectroscopy" Sixty-Fourth International Symposium on Molecular Spectroscopy, The Ohio State University, Columbus, OH, 2009. |
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| 7 | C. A. Kauffman, K. N. Crabtree and B. J. McCall "A Continuous Supersonic Expansion Discharge Nozzle for Rotationally Cold Ions" Sixty-Fourth International Symposium on Molecular Spectroscopy, The Ohio State University, Columbus, OH, 2009. |
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| 6 | K. N. Crabtree, C. A. Kauffman and B. J. McCall "Performance of a Continuous Supersonic Expansion Discharge Nozzle Evaluated by Laser-Induced Fluorescence Spectroscopy" Sixty-Fourth International Symposium on Molecular Spectroscopy, The Ohio State University, Columbus, OH, 2009. |
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| 5 | M. Perera, K. N. Crabtree, K. B. Ford, H. Kreckel, A. A. Mills and B. J. McCall "Progress in the Development of an Infrared Ion Beam Spectrometer" Sixty-Fourth International Symposium on Molecular Spectroscopy, The Ohio State University, Columbus, OH, 2009. |
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| 4 | B. A. Tom, M. B. Wiczer, A. A. Mills, K. N. Crabtree and B. J. McCall "The H3+ + H2 Reaction: A Possible Mechanism for para-H3+ Enrichment in the Diffuse Interstellar Medium" Inaugural Midwest Astrochemistry Meeting, University of Illinois, 2008. |
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| 3 | K. N. Crabtree and B. J. McCall "Design and Construction of a Laser Beam Profiler for Use with Continuous Wave Lasers in the Mid-Infrared" Sixty-Third International Symposium on Molecular Spectroscopy, Ohio State University, Columbus, OH, 2008. |
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| 2 | A. A. Mills, K. N. Crabtree, and B. J. McCall "Progress on the Development of an Infrared Ion Beam Spectrometer" Sixty-Third International Symposium on Molecular Spectroscopy, Ohio State University, Columbus, OH, 2008. |
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| 1 | B. A. Tom, M. B. Wiczer, A. A. Mills, K. N. Crabtree, and B. J. McCall "Observation of Nuclear Spin Selection Rules in Supersonically Expanding Plasmas Containing H3+" Sixty-Third International Symposium on Molecular Spectroscopy, Ohio State University, Columbus, OH, 2008. |
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Posters
| 5 | C. A. Kauffman, K. N. Crabtree and B. J. McCall "The Performance of a Continuous Supersonic Expansion Discharge Source" Second Midwest Astrochemistry Meeting, University of Illinois, 2009. |
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| 4 | K. N. Crabtree, K. B. Ford, C. A. Kauffman, H. Kreckel, A. A. Mills, M. Perera, B. M. Siller and B. J. McCall "SCRIBES: Sensitive, Cooled, Resolved, Ion BEam Spectroscopy" Advancing Chemical Understanding Through Astronomical Observations, Green Bank Telescope, Green Bank, WV, 2009. |
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| 3 | A. A. Mills, H. Kreckel, M. Perera, K. N. Crabtree, B. M. Siller, K. B. Ford and B. J. McCall "Ultrasensitive Infrared Spectroscopy of Molecular Ions" Air Force Molecular Dynamics Contractors Meeting, San Diego, CA, 2009. |
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| 2 | A. A. Mills, K. B. Ford, K. N. Crabtree and B. J. McCall "High Resolution Spectroscopy of Molecular Ions: Development of an Instrument" Inaugural Midwest Astrochemistry Meeting, University of Illinois, 2008. |
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| 1 | K. N. Crabtree, C. A. Kauffman and B. J. McCall "A Continuous Supersonic Expansion Discharge Source for the Production of Cold Molecular Ions" Inaugural Midwest Astrochemistry Meeting, University of Illinois, 2008. |
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Other Publications
| 1 | K. N. Crabtree "Design of a Continuous Supersonic Expansion Discharge Source for the Acquisition of a Rotationally-Cold Vibrational Spectrum of CH5+ with the SCRIBES Instrument" Research Prospectus for Preliminary Examination, University of Illinois, 2009. |
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Pre-McCall Group Publications
K. N. Crabtree, K. J. Hostetler, T. E. Munsch, P. Neuhaus, P. M. Lahti, W. Sander and J. S. Poole, "A Comparative Study of the Azidopyridine-1-Oxides" Journal of Organic Chemistry (2008), 73, 3441 - 3451.K. J. Hostetler, K. N. Crabtree and J. S. Poole, "The Photochemistry of 4-Azidopyridine-1-Oxide" Journal of Organic Chemistry (2006), 71, 9023-9029.