个人简介

B.S., Yale University, 1979; M.S., 1979; C.P.G.S., University of Cambridge, 1980; Ph.D., University of California, 1986. Assistant Professor, Caltech, 1988-94; Associate Professor, 1994-2003; Professor, 2003-. Executive Officer, 2006-10.

研究领域

The Okumura Group is interested in the application of laser spectroscopy and reaction dynamics to problems in atmospheric chemistry and climate change. We study atmospheric free radicals and transient intermediates in order to understand the reactions and photochemistry that are most important in the troposphere and stratosphere, as well as in planetary atmospheres such as those of Mars and Titan. Our goal is both to determine parameters of key reactions and species in the atmosphere, and to understand the chemical physics of these processes at the most fundamental level. To achieve high sensitivities required for these experiments, we develop and apply state-of-the-art methods such as cavity-enhanced spectroscopy, frequency comb lasers, and VUV mass spectrometry using synchrotron radiation. We also apply high resolution spectroscopy for measuring spectroscopic parameters needed for the latest generation of CO2 satellites. Our group has extensive collaborations with scientists at the NASA Jet Propulsion Laboratory. • Laser spectroscopy of reactive intermediates • Development of methods in cavity-enhanced, cavity-ringdown and frequency comb laser spectroscopy • Reaction rates, mechanisms and dynamics of free radicals, clusters, and transient species • Chemistry of peroxyl and alkoxyl radicals • Photochemistry and photodissociation dynamics • Nonadiabatic effects and multiple surfaces in radical reactions • Kinetic isotope effects; clumped isotopes • High precision spectroscopy with applications in remote sensing of greenhouse gases such as NASA’s Orbiting Carbon Observatory (OCO-2) mission

Chemistry

近期论文

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Praynay Morajkar, Coralie Schoemaecker, Mitchio Okumura, and Christa Fittschen, Direct Measure Equilibrium Constants of the Reaction of Formaldehyde and Acetaldehyde with HO2 Radicals, J. Chem Kin. DOI 10.1002/kin.20817 (2013). Matthew K. Sprague, Laura A. Mertens, Heather N. Widgren, and Mitchio Okumura, Stanley P. Sander and Anne B. McCoy, Cavity Ringdown Spectroscopy of the Hydroxy-Methyl-Peroxy Radical, J. Phys. Chem. A, DOI: 10.1021/jp400390y (2013). Kana Takematsu, Nathan C. Eddingsaas, David J. Robichaud, and Mitchio Okumura, Spectroscopic studies of the Jahn-Teller effect in the à 2E″ state of the nitrate radical NO3, Chem. Phys. Letters, 555, 57 (2013). Matthew K. Sprague, Eva R. Garland, Andrew K. Mollner, Claire Bloss, Brian D. Bean, Marissa L. Weichman, Laura A. Mertens, Mitchio Okumura, and Stanley P. Sander, “Kinetics of n-Butoxy and 2-Pentoxy Isomerization and Detection of Primary Products by Infrared Cavity Ringdown Spectroscopy”, J. Phys. Chem. A, 116, 6327 (2012). David A. Long, Agata Cygan, Roger D. Van Zee, Mitchio Okumura, Charles E. Miller, Daniel Lisak and Joseph. T. Hodges, “Frequency-Stabilized Cavity Ringdown Spectroscopy”, (Frontiers article) Chem. Phys. Letters, 536, 1 DOI: 10.1016/j.cplett.2012.03.035, (2012). Laurence Y. Yeung, Mitchio Okumura, Jianming Zhang, Timothy K. Minton, Jeffrey T. Paci, Amir Karton, Jan M. L. Martin, Jon P. Camden and George C. Schatz, “O(3P) + CO2 Collisions at Hyperthermal Energies: Dynamics of Non-Reactive Scattering, Oxygen Isotope Exchange, and Oxygen-Atom Abstraction", J. Phys. Chem. A 116, 64 DOI: 10.1021/jp2080379, (2012). Fred J. Grieman, Aaron C. Noell, Casey Davis-Van Atta, Mitchio Okumura, and Stanley P. Sander, “Determination of Equilibrium Constants for the Reaction between Acetone and HO2 Using Infrared Kinetic Spectroscopy”, J. Phys. Chem. A, 115, 10527–10538 (2011). David A. Long, Mitchio Okumura, Charles E. Miller and Joseph. T. Hodges, “Frequency-stabilized cavity ring-down spectroscopy measurements of carbon dioxide isotopic ratios”, 105, 471-477, Appl. Phys. B, DOI 10.1007/s00340-011-4518-z (2011). David A. Long, Kasia Bielska, Daniel Lisak, Daniel K. Havey, Mitchio Okumura, Charles E. Miller, and Joseph T. Hodges, “The air-broadened, near-infrared CO2 line shape in the spectrally isolated regime: Evidence of simultaneous Dicke narrowing and speed dependence”, J. Chem. Phys.,135, 064308-1-064308-7, DOI:10.1063/1.3624527 (2011). David A. Long, Daniel K. Havey, S. S. Yu, Mitchio Okumura, Charles E. Miller and Joseph T. Hodges, “O2 A-Band Line Parameters to Support Atmospheric Remote Sensing. Part II. The Rare Isotopologues”, J. Quant. Spectrosc. Rad. Transfer, 112, 2527-2541, DOI:10.1016/j.jqsrt.2011.07.002 (2011). Andrew K. Mollner, Lin Feng, Matthew K. Sprague, Mitchio Okumura, D. B. Milligan, William J. Bloss, Stanley P. Sander, Philip T. Martien, Robert A. Harley, and Anne B. McCoy, and William Carter, “Rate of gas phase Association of Hydroxyl Radical and Nitrogen Dioxide”, Science, 330, 646 (2010). David A. Long, Daniel K. Havey, M. Okumura, C. E. Miller and J. T. Hodges, “Cavity ring-down spectroscopy measurements of sub-Doppler hyperfine structure”, Phys. Rev. A. 81, 064502 (2010). David A. Long, Daniel K. Havey, M. Okumura, C. E. Miller and J. T. Hodges, “O2 A-Band Line Parameters to Support Atmospheric Remote Sensing”, J. Quant. Spectrosc. Rad. Transfer, 111, 2021-2036 (2010). Aaron C. Noell, Leah S. Alconcel, David J. Robichaud, Mitchio Okumura, and Stanley P. Sander, “Near-Infrared Kinetic Spectroscopy of the HO2 and C2H5O2 Self-Reactions and Cross-Reactions”, J. Phys. Chem. A, 114, 6983–6995 (2010). Anne B. McCoy, Matthew J. Sprague, and Mitchio Okumura, “The Role of Torsion/Torsion Coupling in the Vibrational Spectrum of Cis-Cis HOONO”, J. Phys. Chem. A, 114, 1324-1333 (2010). Duncan Wild, Keith T. Kuwata, Chi-Kin Wong, Julio D. Lobo, Andrei Deev, Thomas Schindler, Mitchio Okumura, and Evan J. Bieske, Infrared Spectra of Mass-Selected Br (NH3)n and INH3 Clusters”, J. Phys. Chem. A, 114, 4762–4769 (2010). Daniel K. Havey, David A. Long, M. Okumura, C. E. Miller and J. T. Hodges, “Ultra-Sensitive Optical Measurements of High-J Transitions in the O2 A-band”, Chem. Phys. Letters, 483, 49–54 (2009). David A. Long, Daniel K. Havey, Mitchio Okumura, Herbert M. Pickett, Charles E. Miller and Joseph T. Hodges, “Laboratory measurements and theoretical calculations of O2 A-band electric quadrupole transitions”, Phys. Rev. A, 80, 042513 (2009). Laurence Y. Yeung, Mitchio Okumura, Jeffrey Paci, George C. Schatz, Jianming Zhang, Timothy K. Minton, “Hyperthermal O-Atom Exchange Reaction O2 + CO2 Through a CO4 Intermediate", J. Am. Chem. Soc. 131, 13940–13942 ( 2009). David J. Robichaud, Laurence Y. Yeung, David A. Long, Mitchio Okumura, Daniel K. Havey, Joseph T. Hodges, Charles E. Miller and Linda R. Brown, “Experimental Line Parameters of the Band of Oxygen Isotopologues at 760 nm Using Frequency-Stabilized Cavity Ring-Down Spectroscopy”, J. Phys. Chem. A,113, 13089–13099 (2009).