James J. O'Brien
Dr. O'Brien received his B.Sc. (Hons) from James Cook University, and his Ph.D. degree from the Australian National University. He joined UM-St. Louis after postdoctoral positions at the University of California-Berkeley, the National Research Council of Canada, and the University of Arizona.
Research Interests
Jim O'Brien is an experimental physical chemist who specializes in fundamental and applied, high-resolution laser spectroscopy and gas phase analytical chemistry. The primary tool employed is Intracavity Laser Spectroscopy. ILS techniques provide tremendously enhanced sensitivity for obtaining quantitative absorption spectra. Research areas include: (1) the acquisition of quantitative absorption spectroscopy parameters (e.g., absorption coefficients for methane in the visible to near-IR spectral region to assist in interpreting spectra of the outer planets such as Neptune and line positions for the high-resolution spectrum of molecular O2 for visible and near-IR bands; (2) high-resolution electronic spectroscopy of small molecules (e.g., CuCl, NiCl, NiH) with a view to locating excited electronic states in these species; (3) the gas phase chemistries and species involved in a variety of chemical vapor deposition (CVD) processes (e.g., the plasma deposition of films of diamond-like carbon (DLC), diamond-like nanocomposites (DLN), and silicon oxide); and (4) the further development of the intracavity laser spectroscopy (ILS) technique for analytical purposes (e.g., in acquiring spectra at ultra-high spectral resolution) and its range of applications (e.g., extension of ILS into the IR region by use of fiber lasers).
Selected Publications
"Intracavity laser absorption spectroscopy of platinum sulfide in the near infrared", K. Handler, L. C. O'Brien and J. J. O'Brien, J. Mol. Spectrosc. 2010, 263, 78.
"Spectroscopy of NiF by intracavity laser spectroscopy: Identification and analysis of the (1,0) band of the [11.1] 2P3/2-X 2P3/2 electronic transition", R. A. Harris, L. C. O'Brien and J. J. O'Brien, J. Mol. Spectrosc. 2010, 259, 116.
"Sb2S3:C/CdS p-n junction by laser irradiation", A. Arato, E. Cardenas, S. Shaji, J. J. O'Brien, J. Liu, A. G..Castillo, T. K. Das Roy and B. Krishnan, Thin Solid Films 2009, 517, 2493.
"Laboratory measurements of the (2,0) B2D5/2-X2D5/2 transition of nickel hydride using intracavity laser absorption spectroscopy", S. Shaji, A. Song, M. Li, J. J. O'Brien and L. C. O'Brien, Can. J. Phys. 2009, 87, 583
"Spectroscopy of PtO by intra-cavity laser spectroscopy: Identification of the A30+ -x1 electronic transition", H. Liu, L. C. O'Brien, S. Shaji and J. J. O'Brien, J. Mol. Spectrosc. 2009, 253, 73.
"Intracavity laser absorption spectroscopy of AuO. Identification of the B 2S --X 2P3/2 transition", L. C. O'Brien, B. A. Borchert, A. Farquhar, S. Shaji, J. J. O'Brien, J. Mol. Spectrosc. 2008, 252, 136-142.
"Intracavity laser absorption spectra of nickel hydride", S. Shaji, J. Nunn, J. J. O'Brien, L. C. O'Brien, Astrophysical Journal, 2008, 672, 722
"Intracavity laser absorption spectroscopy of AuO: Identification of the b 4P3/2-X 2P3/2 transition" , S. Shaji, A. Song, J. J. O'Brien, B. A. Borchert and L. C. O'Brien, J. Mol. Spectrosc. 2007, 243, 37.
"Fourier transform spectroscopy of NiCl. Identification of the [10.3] 4F7/2 state", K. D. Gibbs, D. J. Trader, L. C. O'Brien and J. J. O'Brien, J. Mol. Spectrosc., 2006, 240 , 64.
"Spectroscopy of nickel chloride: Identification of the [15.0] 2P3/2 and [15.0] 2D5/2 states", J. W-H. Leung, J. Ye, A. S-C. Cheung, K. D. Gibbs, D. L. Palmer, L. C. O'Brien and J. J. O'Brien, J. Mol. Spectrosc., 2006, 238, 42.
"Spectroscopy of NiCl: Identification of the X2P1/2 state", C. A. Rice, Corey T. L. Kellerman, B. Owen, L. C. O'Brien, H. Cao and J. J. O'Brien, J. Mol. Spectrosc., 2006, 235, 271.
"Laboratory measurements of NiH by intracavity laser absorption spectroscopy", L. C. O'Brien and J. J. O'Brien, Astrophys. Journal, 2005, 621, 554.
"Spectroscopy of AuO: Identification of the [10.7] P 3/2 to X2P3/2 Transition", L. C. O'Brien, S. C. Hardimon and J. J. O'Brien, J. Phys. Chem. A, 2004, 108, 11302.
"Fourier transform spectroscopy of NiCl: identification of a [9.1] W = 3/2 state", S. Tumturk, L. C. O'Brien and J. J. O'Brien, J. Mol. Spectrosc., 2004, 225, 225.
"Absorption spectra and absorption coefficients for methane in the 750-940 nm region obtained by intracavity laser spectroscopy", J. J. O'Brien and H. Cao, Journal of Quantitative Spectroscopy and Radiative Transfer, 2002, 75, 323.
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