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Showing 1 to 20 of 59 for “"flash photolysis"”.
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Infrared-monitored flash-photolysis of carboxymyoglobin
An infrared-monitored flash-photolysis apparatus capable of measuring absorbance changes to 10$\sp{-3}$OD over a time range from 10$\mu$s to 10s is described. Measurements made on this apparatus, combined with slower measurements made on a Fourier-transform infrared spectrometer, of the …
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Flash Photolysis and Flash Heating of Potassium Permanganate Crystals
Made available in DSpace on 2014-12-09T17:35:46Z (GMT). No. of bitstreams: 1 6711878.pdf: 3620296 bytes, checksum: 5c16454b8e7e0483daa2f84c5e833f1c (MD5) Previous issue date: 1967
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Characterizing triplet azo biradical and corannulene- halogen complexes by laser flash photolysis
<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 …
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Photolytic Studies of Aryl and Heteroaryl Nitrenium Ions: Laser Flash Photolysis Studies
… 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 …
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The Reaction Kinetics of Neutral Free Radicals and Radical Ions Studied by Laser Flash Photolysis
… 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 pattern was …
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Solute effects on the production and decay of primary species in the flash photolysis of indole
… in the microsecond, broadband (X > 260 nm) flash photolysis of helium-saturated, neutral aqueous solutions of indole, in the absence and in the presence of the solutes NaBr, BaCl2*2H20 and CdSCV Fluorescence spectra and fluorescence lifetimes have also been obtained in the absence and in the …
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ΦΩΤΟΧΗΜΙΚΗ ΚΑΙ ΗΛΕΚΤΡΟΧΗΜΙΚΗ ΜΕΛΕΤΗ ΤΗΣ ΜΕΤΑΦΟΡΑΣ ΚΑΙ ΑΠΟΘΗΚΕΥΣΗΣ ΕΝΕΡΓΕΙΑΣ ΜΕ ΕΝΩΣΕΙΣ ΣΥΝΑΡΜΟΓΗΣ ΤΟΥ ΣΙΔΗΡΟΥ (ΙΙΙ)
… 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 POTENTIALS …
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pH effects and rebinding pathways in CO adducts of heme proteins
… bands over the range 2200-1900 cm$\sp{-1}$. Flash photolysis can break the Fe-C bond, freeing the ligand. Below the glass-transition temperature of the protein-solvent system, $T\sb{g} \approx$ 185K, heme proteins are frozen into static conformations, and the photolyzed ligand, trapped within …
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^Das^ Fulleren C 60 als molekulare Sonde für Untersuchungen zum Elektronentransfer beim massenspekrometrischen Verfahren der Desorption/Ionisation
… Meßanordnungen nach dem Prinzip der Laser-Flash-Photolysis bzw. Diffuse-Reflectance-Laser-Flash-Photolysis aufgebaut, die eine optische Detektion von C60-Anionen bei der charakteristischen Wellenlänge von 1060 nm ermöglichten. Ein wesentliches Ergebnis ist, daß der Elektronentransfer zum …
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Explore the Formation of Triplet Nitrene - A Potential Intermediate for Building Organic Magnets
… 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, …
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Motions in myoglobin
… the protein to function. Pressure release and flash photolysis experiments help characterize some of these protein motions.
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Predicting combustion properties of hydrocarbon fuel mixtures
… 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 measuring …
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A Nanosecond Laser Spectrophotometric and Product Investigation of the Chemistry of Fluorenylidene
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 …
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Primary Photoproducts and the Mechanism of Ligand Substitution in the Photochemistry of Dinuclear Metal Carbonyls
Flash photolysis methods were used to investigate the photochemistry of bis(pentamethylcyclopentadienylmolybdenumtricarbonyl). The results indicate that both metal-metal bond homolysis and CO loss occur as primary photoprocesses. Transient absorbances in the visible region were observed for both …
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Ultrafast studies of diffusion and electron transfer
Picosecond flash photolysis is used to study the recombination of carbon monoxide to protoheme in glycerol:water over ten decades in time (1 ps to 10 ms). The rebinding consists of an initial nonexponential geminate phase followed by a slower exponential bimolecular phase. The entire time course of …
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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)
… 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 nitrenes, …
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The Influence of Pressure on The Low-Temperature Kinetics of Myoglobin
… (60 - 160K) was studied using high pressure flash photolysis techniques. By comparing the pressure dependence when the system is first frozen and then pressurized with the pressure dependence when the system is first pressurized and then frozen, the total volume change for the reaction can be …
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Addition and recombination reactions of unsaturated radicals using a novel laser kinetics spectrometer
… to detect various transient species in laser flash photolysis kinetics experiments via direct absorption. The spectral range of the laser, when used with a harmonic generator, covers most of the visible wavelength region, allowing for the detection of a wide array of organic radical species. …
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Unraveling the mechanism of the lightstruck flavor of beer
… 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 …
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