个人简介

S.B. Massachusetts Institute of Technology Ph.D. University of California at Berkeley

研究领域

molecular spectroscopy and dynamics /molecular clusters /quantum solids /matrix isolation spectroscopy

Our research centers around the information on molecular structure and dynamics that can be attained from high resolution spectroscopy using matrix isolation spectroscopy. We have recently completed the design and construction of a new apparatus for studying species trapped in a solid hydrogen matrix at temperatures as low as 2 K. Solid hydrogen is a novel matrix material (a so-called "quantum solid") that has attracted much attention recently. The low mass and weak attraction hydrogen has makes its solid phase rather special: it has a very low density and very open structure. Moreover, the inability of hydrogen to quickly relax its first excited rotational state to its ground state (because such a relaxation requires a nuclear spin flip as well as a rotational motion energy loss) means there are effectively two types of hydrogens: those in the lowest rotational state (J = 0 or para-hydrogen, pH2) and those in the first-excited (J = 1 or ortho-hydrogen, oH2) state. (At these low temperatures, these are the only two states that matter.)

近期论文

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Infrared Spectra of OCS Monomer and Clusters in Solid Parahydrogen, J. Chem. Phys., in preparation (with B. B. Smith and R. Ditchfield). Novel Preparation and Characterization of Doped Parahydrogen Solids, Rev. Sci. Inst., in preparation (with B. B. Smith). Lineshape Analysis of CO in Kr and Xe Matrices (with P. Hu), Phys. Chem. Letters, in preparation. Infrared Spectrum of Matrix-Isolated CO and CO Photoproduct from OCS Photolysis, J. of Phys. Chem. A, 104, 3472 (2000). Matrix Isolated HF: the High-Resolution Infrared Spectrum of a Cryogenically Solvated Hindered Rotor, Chem. Phys. 189, 171 (1994).