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Showing 1 to 20 of 27 for “"Laser Flash Photolysis"”.

  1. Characterizing triplet azo biradical and corannulene- halogen complexes by laser flash photolysis

    Li, QianUniversity of Cincinnati2012

    <p>In this work the laser flash photolysis technique has been used to study two photo-reaction systems: 1) the photolysis of aryl azides in solution and in solid-state 2) the photo-reaction of corannulene in halogenated solvents.</p><p>Singlet aryl nitrene was formed upon irradiation of aryl …

    ohiolink Repository record

  2. Photolytic Studies of Aryl and Heteroaryl Nitrenium Ions: Laser Flash Photolysis Studies

    Thomas, Selina Ivan2006

    … nitrenium ion generated by photolysis was reacted with amino acids and proteins to determine their reactivity with these ions. Eight amino acids were observed to react with the ion at a rate constant of 10<sup>7</sup> - 10<sup>9</sup> M<sup>-1</sup> s<sup>-1</sup>. The rate …

    maryland Repository record

  3. The Reaction Kinetics of Neutral Free Radicals and Radical Ions Studied by Laser Flash Photolysis

    Friedline, Robert AlanVirginia Tech2004

    … amines, hydrocarbons, and alcohols using laser flash photolysis. Initially, no obvious reactivity relationship between rate constant and substrate structure was observed for these homolytic reactions. However, by closely examining the Arrhenius parameters for hydrogen abstraction, a …

    vt Repository record

  4. ^Das^ Fulleren C 60 als molekulare Sonde für Untersuchungen zum Elektronentransfer beim massenspekrometrischen Verfahren der Desorption/Ionisation

    Klemmt, MarenUniversität Oldenburg

    … in denen die Ionen durch Plasmadesorption oder Laserdesorption/-ionisation erzeugt werden. Für die optisch-spektroskopischen Untersuchungen wurden spezielle Meßanordnungen nach dem Prinzip der Laser-Flash-Photolysis bzw. Diffuse-Reflectance-Laser-Flash-Photolysis aufgebaut, die eine optische …

    oldenburg Repository record

  5. Explore the Formation of Triplet Nitrene - A Potential Intermediate for Building Organic Magnets

    Zhang, XiaomingUniversity of Cincinnati2012

    … affect on the movement of the molecules.</p><p> Photolysis of 3-Phenyl-2-Methyl-2H-Azirine in dichloromethane yields benzaldehyde and 1-chloro-1-phenylpropan-2-one. Similarly, photolysis of 3-Phenyl-2-Methyl-2H-Azirine in bromoform yields benzaldehyde and 1-bromo-1-phenylpropan-2-one. However, …

    ohiolink Repository record

  6. Predicting combustion properties of hydrocarbon fuel mixtures

    Goldsmith, Claude Franklin, IIIMassachusetts Institute of Technology2010

    … I measured reaction rate coefficients using both laser flash-photolysis absorption spectroscopy in a slow-flow reactor and time-of-flight mass spectrometry and laser Schlieren densitometry in a shock tube. Based upon these experimental projects, I helped design a one-of-a-kind instrument for …

    mit Repository record

  7. A Nanosecond Laser Spectrophotometric and Product Investigation of the Chemistry of Fluorenylidene

    Grasse, Peter BrunnerUniversity of Illinois at Urbana-Champaign2014

    Fluorenylidene has been generated by laser flash photolysis of diazofluorene in fluid solution. The chemistry of fluorenylidene has been studied in hexafluorobenzene, cyclohexane, cyclopropane, spiropentane, acetonitrile, and Freon 113 spectroscopically, and chemically by isolation and …

    uiuc Repository record

  8. Part One: Photochemistry of Aryl Azides. Chemical Properties of the Transient Intermediates. Part Two: Thermolysis of an Endoperoxide. Generation of an O-Xylylene Peroxide (Nitrene)

    Schrock, Alan KeithUniversity of Illinois at Urbana-Champaign2014

    … azide, and 2-pyrene azide was examined by laser flash photolysis inert and reactive solvents. The products of direct photolysis of the aryl azides can depend dramatically on the concentration of the azide and on the power of the light source. Direct irradiation gives the triplet aryl …

    uiuc Repository record

  9. Addition and recombination reactions of unsaturated radicals using a novel laser kinetics spectrometer

    Ismail, HuzeifaMassachusetts Institute of Technology2008

    … describes the construction of a novel, low-noise laser kinetics spectrometer. A quasi-CW (picosecond pulse), tunable Ti:Sapphire laser is used to detect various transient species in laser flash photolysis kinetics experiments via direct absorption. The spectral range of the laser, when used with a …

    mit Repository record

  10. ΦΩΤΟΧΗΜΙΚΗ ΚΑΙ ΗΛΕΚΤΡΟΧΗΜΙΚΗ ΜΕΛΕΤΗ ΤΗΣ ΜΕΤΑΦΟΡΑΣ ΚΑΙ ΑΠΟΘΗΚΕΥΣΗΣ ΕΝΕΡΓΕΙΑΣ ΜΕ ΕΝΩΣΕΙΣ ΣΥΝΑΡΜΟΓΗΣ ΤΟΥ ΣΙΔΗΡΟΥ (ΙΙΙ)

    Μιχαήλ, ΧρυσόστομοςΑριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)1987

    … EMPLOYED WEREPOLAROGRAPHY, CYCLIC VOLTAMETRY AND LASER FLASH PHOTOLYSIS. THE RESULTS OF THEELECTROCHEMICAL STUDY SHOWED THAT THE ELECTRON ACQUISITION, BY THE TRIS (B-DIONATO) IRON (III) CHELATES IS REVERSIBLE REACTION. IT WAS ALSO FOUND THAT A LINEAR RELATIONSHIP EXISTS BETWEEN THE REDUCTION …

    greece Repository record

  11. Unraveling the mechanism of the lightstruck flavor of beer

    Heyerick, Arne2001

    … photostationary irradiation and photodynamic flash-initiated experiments. Information on the nature of intervening photo-excited states and intermediates, along with mechanistic features, were retrieved from time-resolved electron paramagnetic resonance (TREPR) and flash photolysis transient …

    ghent Repository record

  12. Direct measurement and analysis of cyclohexadienyl oxidation

    Taylor, James WagnerMassachusetts Institute of Technology2005

    … The cyclohexadienyl radical is created using laser-flash photolysis. The UV absorption bands of the radical are probed and it's relative concentration over time measured in non-polar solvents in both the presence and absence of oxygen. Several analytical and numerical models of the chemistry …

    mit Repository record

  13. Effects of Water Vapor on the Kinetics of the Methylperoxy Radical Self-reaction and Reaction with Hydroperoxy

    Mower, Alecia2007

    … at temperatures between 263 and 303 K using laser flash photolysis coupled with UV time-resolved absorption detection at 220 nm and 260 nm. Water vapor concentration was quantified using tunable diode laser spectroscopy operating in the mid-IR. The HO2 self-reaction rate constant is …

    byu Repository record

  14. The Chemistry of Aroyl Azides in Piperidine- and Steroid-Separated Bichromophoric System: Photoinduced Long-Distance Intramolecular Electron Transfer Reactions

    Zhu, YongUniversity of Illinois at Urbana-Champaign2014

    … amine radical cations were detected by pulsed laser spectroscopy and the highly reactive aroyl azide radical anions were identified by the results of steady-state photolysis. In acetonitrile and in methyl alcohol solution, the photoexcited aryl amine converts the azide to a primary amide. The …

    uiuc Repository record

  15. Radical additions of hydrocarbons, ethers and acetals to alkenes via allyl transfer reaction: A new chain reaction for C-H bond functionalization

    Patil, Shradha VasantVirginia Tech2013

    … processes were performed using laser flash photolysis and competition kinetics. These experiments helped us to measure the reactivity and selectivity of PINO as a chain carrier in comparison with Br. Additionally, a new competition experiment was designed to study the relative …

    vt Repository record

  16. DIARYL NITRENIUM IONS: ELECTRONIC STATE REACTIONS, MECHANISTIC STUDIES, AND PEPTIDE LABELING

    Chinn, Edward2025

    … a discrete structure and be directly observed by laser flash photolysis. In this dissertation the mechanisms and reactions of diaryl nitrenium ions will be examined. Further, the peptide WWCNDGR will be selectively labeled with a diaryl nitrenium ion.Chapter 1 reviews relevant photochemistry …

    maryland Repository record

  17. Novel Iridium (III) complexes for photocatalytic H2 generation from H2O using sunlight

    Soman, SurajDublin City University2012

    … Time Corelated Single Photon Counting (TCSPC), Laser Flash Photolysis and Gas Chromatography (GC) are briefly described in this chapter. Chapter 3 deals with the synthesis of iridium polypyridyl complexes with various cyclometallating ligands used for intermolecular and intramolecular …

    dcu Repository record

  18. Novel Thienyl Dyes and related Metal Carbonyl Complexes

    Boyle, NicolaDublin City University2010

    … is followed by an outline of the techniques of laser flash photolysis, time-resolved infrared (TRIR) spectroscopy and time correlated single photon counting. Chapter two involves the study of thienyl porphyrins. This chapter begins with a literature survey on the synthesis, photophysics and …

    dcu Repository record

  19. Measuring rate constants and product branching for reactions relevant to combustion and atmospheric chemistry

    Buras, Zachary J. (Zachary James)Massachusetts Institute of Technology2018

    … of gas-phase radicals, often with the aid of lasers. In more recent decades, ab initio predictions of product branching using quantum chemical calculations combined with modem rate theories have become common. However, there are few experimental measurements against which to validate predicted …

    mit Repository record

  20. Selective Oxidations by Metalloporphyrins and Metallocorroles

    Chen, Tse-Hong

    … species that can be directly observed by laser flash photolysis methods. It is noteworthy that the use of visible light (solar light) for activation of atmospheric oxygen without the consumption of a reducing agent in aforementioned photocatalysis is particularly relevant to realizing …

    wku-diss Repository record

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