Gas phase Photo-Formation and Vacuum UV Photofragmentation Spectroscopy of Tryptophan and Tyrosine Radical-Containing Peptides

2011 ◽  
Vol 115 (32) ◽  
pp. 8933-8939 ◽  
Author(s):  
Claire Brunet ◽  
Rodolphe Antoine ◽  
Abdul-Rahman Allouche ◽  
Philippe Dugourd ◽  
Francis Canon ◽  
...  
Keyword(s):  
Gas Phase ◽  
Tyrosine Radical ◽  
Vacuum Uv

Fast Vacuum‐uv Light Source for Gas Phase Flash Photolysis

1967 ◽  
Vol 38 (12) ◽  
pp. 1728-1730 ◽  
Author(s):  
K. H. Welge ◽  
J. Wanner ◽  
F. Stuhl ◽  
A. Heindrichs
Keyword(s):  
Gas Phase ◽  
Light Source ◽  
Flash Photolysis ◽  
Uv Light ◽  
Vacuum Uv

A kinetic study of the reactions of OH radicals with fluoroethanes. Estimates of C—H bond strengths in fluoroalkanes

1983 ◽  
Vol 61 (5) ◽  
pp. 861-865 ◽  
Author(s):  
Jean-Pierre Martin ◽  
George Paraskevopoulos
Keyword(s):  
Kinetic Study ◽  
Gas Phase ◽  
Rate Constants ◽  
Flash Photolysis ◽  
Oh Radicals ◽  
Bond Dissociation Energies ◽  
Time Resolved ◽  
Dissociation Energies ◽  
Bond Strengths ◽  
Vacuum Uv

A kinetic study of the reactions of OH radicals with a series of fluoroethanes in the gas phase is presented. OH radicals were generated by flash photolysis of H2O vapor in the vacuum uv (λ > 165 nm) and were monitored in absorption by time-resolved attenuation of resonance radiation at 308.15 nm [OH(A2Σ+ → X2Π)]. The following absolute rate constants (in units of 109 cm3mol−1 s−1 at the 95% confidence limit) were determined at [Formula: see text][Formula: see text][Formula: see text][Formula: see text][Formula: see text]From a linear correlation of the present and previously published rate constants with bond dissociation energies, the following quantities (in kcal mol−1 at 298 K) were estimated to be: D(CH3CHF—H) = 96.3 ± 1.5, D(CH2FCHF—H = 98.8 ± 1.0, D(CF3CHF—H) = 103.5 ± 1.0, D(CHF2CF2—H) = 103.0 ± 1.5, and [Formula: see text][Formula: see text]

Vacuum-UV- (VUV-) Photochemically Initiated Oxidation of Dimethylamine in the Gas Phase

2008 ◽  
Vol 11 (2) ◽  
Author(s):  
Fouad Fethi ◽  
Juan López-Gejo ◽  
Martin Köhler ◽  
André M. Braun
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Gas Phase ◽  
Vacuum Ultraviolet ◽  
Oxidative Degradation ◽  
Product Distribution ◽  
Photochemical Oxidation ◽  
Experimental Conditions ◽  
On Line ◽  
Vacuum Uv

AbstractThe vacuum ultraviolet (VUV-) photochemical oxidation of dimethylamine in the gas phase was investigated in the presence and absence of molecular oxygen and water vapor. Primary intermediate products of the oxidative degradation were identified by the combination of gas chromatography and mass spectrometry (GC/MS), and the product distribution was determined for different experimental conditions. The evolution of the substrate concentration was followed by on-line gas chromatography. The production of CO

A Spectrometric Technique for Monitoring [O2(a1 Δg)] in the Gas Phase

1986 ◽  
Vol 40 (2) ◽  
pp. 203-209 ◽  
Author(s):  
J. A. Coxon ◽  
U. K. Roychowdhury
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Flow System ◽  
Germanium Detector ◽  
Hydrogen Emission ◽  
Partial Pressures ◽  
Hydrogen Emission Lines ◽  
Fast Flow ◽  
Vacuum Uv ◽  
Absorption Of Hydrogen

The reaction of chlorine with alkaline hydrogen peroxide has been used to produce O2( a1 Δ g) in a fast flow system at partial pressures up to about 0.5 Torr, and total pressures (mostly argon) in the range 0.8–2.5 Torr. Absolute concentrations of O2( a1 Δ g) were determined from the intensity of absorption of hydrogen emission lines in the vacuum-UV at 144.095 and 148.66 nm, for which the cross sections are known. The intensity of the O2 ( a → X) transition at 1270 nm, monitored simultaneously with a simple germanium detector, was found to vary linearly with [O2( a1 Δ g)], as expected. The germanium detector was calibrated at 1270 nm with a readily reproducible standard, the air afterglow continuum due to NO2* at defined concentrations of O(3P) and NO. The ratio of ka for O2( a) ka O 2( X) + hvt to kc for O + NO kc NO2 + hv, is (1.4 ± 0.2) × 10−7 mol L−1 at 1270 nm.

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