ion from 1-hexene, changes in reactions involving 1-hexene also affect the prediction of 1,3-butadiene. For example, the predicted peak concentration of 1,3-butadiene increases by 13% of the MPC due to a higher concentration profile of 1-hexene after a slower 1-hexene thermal decomposition reaction (using the generic rate of reaction 1 in Table 1) is selected. 1-Butylene has an important effect...

One of the main goals in catalysis is the characterization of solid/gas interfaces in a reaction environment. The electronic structure and chemical composition of surfaces become heavily influenced by the surrounding environment. However, the lack of surface sensitive techniques that are able to monitor these modifications under high pressure conditions hinders the understanding of such process...

The kinetics of reactions of the OH radical with ethene, ethyne (acetylene), propyne (methyl acetylene) and t-butyl-hydroperoxide were studied at temperatures of 69 and 86 K using laser flash-photolysis combined with laser-induced fluorescence spectroscopy. A new pulsed Laval nozzle apparatus is used to provide the low-temperature thermalised environment at a single density of approximately 4x1...

The following acetylenic substrates have been shown to mediate NADPH-dependent loss of cytochrome P450 on incubation with hepatic microsomes from phenobarbital-pretreated rats: 1-ethynylcyclohexanol, 1ethynylcyclopentanol, 3-methyl-1-pentyn-3-01, norethisterone, (1-methoxycyclohexyl)acetylene, 3-(2,4-dichlorophenoxy)-1-propyne, 3-(4-nitrophenoxy)-l-propyne, 3-phenoxy-l-propyne, 4-phenyl-l-butyn...

Ab initio quantum chemical simulations were coupled with variational transition state theory in estimating rate constants for the H C3H3 and H C3H5 recombination reactions. The energy of interaction between the H atom and each of the radicals was evaluated at the CAS 1 2 level for the range of separations and relative orientations spanning the transition state region. An analytic representation...

The Voyager 1 flyby of Titan in 1980 gave a first glimpse of the chemical complexity of Titan’s atmosphere, detecting many new molecules with the infrared interferometer spectrometer (IRIS). These included propane (C3H8) and propyne (CH3C2H), while the intermediate-sized C3Hx hydrocarbon (C3H6) was curiously absent. Using spectra from the Composite Infrared Spectrometer on Cassini, we show the ...

Vacuum ultraviolet ~VUV! laser photoionization is combined with time-of-flight ~TOF! mass spectrometry to determine the photofragments produced from the laser photodissociation of allene and propyne in a molecular beam. Detection of C3H3 1 confirms that atomic hydrogen elimination is the primary process for both of these molecules. A hydrogen molecule elimination channel and a low mass carbon f...

Date: ________________ The final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline Negative ion photoelectron spectroscopy is utilized to investigate the methyl anions (CH3 – and CD3 –), the propadienylidene anion (H2CCC –), and the propargylene anion...

The present series of experiments used gas chromatography to identify vapor-phase photoproducts liberated during excimer laser irradiation of cardiovascular tissues in air and blood. In air, laser beams produced from ArF (193 nm) and XeF (351 nm) excimer laser gas mixtures were delivered to samples of myocardium and atherosclerotic coronary arterial segments through the wall of a quartz cell, u...