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Filtering by: Creator Condón, S. Remove constraint Creator: Condón, S. Academic Affiliation Chemistry Remove constraint Academic Affiliation: Chemistry Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

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  • Zero Kinetic Energy Photoelectron Spectroscopy of Polycyclic Aromatic Hydrocarbons

    Creator:
    Harthcock, Colin
    Abstract:
    In this dissertation, I describe spectroscopic studies of jet-cooled polycyclic aromatic hydrocarbons (PAH) and one nitrogen substituted PAH (PANH) using pulsed field zero kinetic energy (ZEKE) photoelectron spectroscopy and resonantly enhanced multiphoton ionization (REMPI) spectroscopy. Recently, there has been a demand for far-infrared (FIR) spectral information of astrophysically relevant molecules...
    Resource Type:
    Dissertation
    Full Text:
    structure of small stable PAHs generally follows the Franck-Condon principle, but vibronic coupling is

  • Zero kinetic energy photoelectron spectroscopy of polycyclic aromatic hydrocarbons

    Creator:
    Zhang, Jie
    Abstract:
    In this dissertation, I present electronic spectra of a few polycyclic aromatic hydrocarbons (PAHs): tetracene, pentacene, pyrene, benzo[g,h,i]perylene and benzo[a]pyrene using resonantly enhanced multiphoton ionization (REMPI) and zero kinetic energy (ZEKE) photoelectron spectroscopy. The work of tetracene and pentacene also combine a laser desorption source with a ZEKE spectrometer, demonstrating...
    Resource Type:
    Dissertation
    Full Text:
    chemical identification. Although ZEKE is governed by the Franck-Condon principle, some IR active bands

  • Fluorescence studies on the bases of the nucleic acids in solution at room temperature

    Creator:
    Hauswirth, William Walter
    Abstract:
    Fluorescence of adenine, guanine, thymine, cytosine, and uracil has been detected at room temperature in neutral aqueous solution using a digital signal accumulation technique and right angle fluorescence detection from solutions with absorbances between 0. 4 and 0. 7. The quantum yields are respectively 2.6 x 10⁻⁴, 3.0 x 10⁻⁴,...
    Resource Type:
    Dissertation
    Full Text:
    cd y 15 Franck-Condon State (A) -12 vibrational relaxation (ic ) 10 sec. v' S 1 1 b = 0r

  • Investigation of Chain Extension Approaches for the Stereoselective Reagent-Controlled Synthesis of alpha-Heteroatom Substituted Alkyl Boronic Esters

    Creator:
    Barsamian, Adam L.
    Abstract:
    Two distinct strategies were explored for the enantioselective synthesis of α-heteroatom substituted alkyl boronic esters by stereoselective reagent-controlled homologation using transient chiral carbenoid reagents CHYMX (Y = heteroatom, X = nucleofuge, M = electrofuge). In the first case, a stereospecific reagent-controlled homologation (sStReCH) approach to α-alkoxyalkylboronates using α-metalated S,O- and...
    Resource Type:
    Dissertation
    Full Text:
    using α-metalated S,O- and O,O-acetals was pursued that necessitated the development of methods to

  • Electronic spectroscopy of biological relevant species and their complexes with solvent molecules

    Creator:
    He, Yonggang
    Abstract:
    In this dissertation, I present electronic spectroscopy of a few biologically relevant species and their complexes with solvent molecules in the gas phase using a variety of techniques, including resonantly enhanced multiphoton ionization (REMPI), laser induced fluorescence (LIF), and zero kinetic energy (ZEKE) photoelectron spectroscopy. My work on several methylated...
    Resource Type:
    Dissertation
    Full Text:
    vibrational levels of the S state as intermediate states: (a) 0°, (b)A1, and (c) D1 ............... 107 6.4

  • Synthetic approaches to the tricarbonyl subunit of rapamycin

    Creator:
    LaMunyon, James B.
    Abstract:
    Rapamycin (5) was isolated in 1975 from the soil bacteria Streptomyces hygroscopicus and its structure was determined from spectroscopic techniques and an x-ray crystallographic analysis. Although it was initially found to exhibit antibiotic activity, it was subsequently shown to possess potent immunosuppressive activity as well. Three approaches to the synthesis...
    Resource Type:
    Masters Thesis
    Full Text:
    afford the tricarbonyl subunit of rapamycin. The aldehyde was successfully prepared in ten steps from (S

  • GaAs(100) surface chemistry : interactions with molecular chlorine and sulfur compounds

    Creator:
    Mokler, Scott M.
    Abstract:
    An important aspect in device technology is the processing of GaAs to produce highly-resolved etch patterns on the substrate. This is done typically on the GaAs(100) surface. Recently, a number of methods, all using chlorinated vapor reactants, have been applied to fabrication of GaAs devices. In spite of these technological...
    Resource Type:
    Dissertation
    Full Text:
    c(8x2) 125 GaAs(100) surface monitored with the S(152 eV) Auger signal. The sulfur exposure is the

  • High-resolution X-ray photoelectron spectroscopy of CO₂ and other small molecules

    Creator:
    Hahne, Jeffrey A.
    Abstract:
    The carbon is photoelectron spectrum of CO₂ has been measured with very high photon energy resolution. The natural lifetime of the carbon is hole state has been determined from a series of spectra taken at photon energies of 308, 320, and 330 eV. The measured values of the lifetimes show...
    Resource Type:
    Masters Thesis
    Full Text:
    FC0+ 51 4.2 Calculated and experimental values of changes in bond lengths 52 4.3 Franck-Condon

  • The photochemistry of some insect juvenile hormone analogs

    Creator:
    Siggel, Lorenz
    Abstract:
    The photochemistry of some analogs of insect growth regulators (IGR's) was studied. Methyl geranate, TY, was synthesized and the mechanisms of its photochemical reaction pathways were studied by a variety of techniques. Direct irradiation of 71 in ether leads to the formation of five new products: 98, the product of...
    Resource Type:
    Dissertation
    Full Text:
    121, causing it to adopt the unreactive s-trans conformation and thus slowing the reaction. Insect

  • Spectroscopic investigation of atomic and molecular species formed in a laser microprobe plasma using a wavelenth calibrated tunable dye laser

    Creator:
    Beenen, Gerhard Joseph
    Abstract:
    The temporal and spatial characteristics of a laser microprobe plume were investigated using the spectroscopic methods of emission, absorption and fluorescence. The plume was produced by rapid vaporization of a small quantity (1 μg) of a solid sample using a focussed pulsed dye laser (110 MW/cm²). For absorption and fluorescence...
    Resource Type:
    Dissertation
    Full Text:
    ) CMX-4 laser F) Vacuum transducer S) Peak height detector G) Stepper motor drivers T) Stepper motor