L. J. Stief
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View article: The reaction between N(4<i>S</i>) and C2H3: Rate constant and primary reaction channels
The reaction between N(4<i>S</i>) and C2H3: Rate constant and primary reaction channels Open
The rate constant and the product branching ratios have been determined at T=298 K for the reaction between ground state atomic nitrogen (4S) and the vinyl radical (C2H3) at a nominal pressure of 1 Torr He. The kinetic technique employed w…
View article: A preliminary report on the photoionization efficiency spectrum, ionization energy and heat of formation of Br{sub 2}O; and the appearance energy of BrO{sup +} (Br{sub 2}O)
A preliminary report on the photoionization efficiency spectrum, ionization energy and heat of formation of Br{sub 2}O; and the appearance energy of BrO{sup +} (Br{sub 2}O) Open
We report experimental results for the photoionization efficiency (PIE) spectrum of Br{sub 2}O along with the ionization energy (derived form the ionization threshold) and the appearance energy (AE) of BrO{sup +} (Br{sub 2}O). A value for …
View article: First International Conference on Laboratory Research for Planetary Atmospheres
First International Conference on Laboratory Research for Planetary Atmospheres Open
Proceedings of the First International Conference on Laboratory Research for Planetary Atmospheres are presented. The covered areas of research include: photon spectroscopy, chemical kinetics, thermodynamics, and charged particle interacti…
View article: Pressure dependence of the absolute rate constant for the reaction Cl+C2H2 from 210–361 K
Pressure dependence of the absolute rate constant for the reaction Cl+C2H2 from 210–361 K Open
The pressure dependence of the absolute rate constant for the reaction Cl+C2H2 →M ClC2H2 has been examined at four temperatures ranging from 210–361 K using the flash photolysis-resonance fluorescence (FP-RF) techniques. The data has been …
View article: Rate constant for the reaction of O(3<i>P</i>) with HBr from 221 to 455 K
Rate constant for the reaction of O(3<i>P</i>) with HBr from 221 to 455 K Open
Absolute rate constants for the reaction O(3P)+HBr→OH+Br have been measured over the temperature range 221–455 K using the flash photolysis technique combined with resonance fluorescence detection of O(3P) atoms. For each of the five tempe…
View article: Rate constant for the reaction NH2+ NO from 216 to 480 K
Rate constant for the reaction NH2+ NO from 216 to 480 K Open
The absolute rate constant was measured by the technique of flash photolysis-laser induced fluorescence (FP-LIF). NH2 radicals were produced by the flash photolysis of ammonia and the fluorescent NH2 photons were measured by multiscaling t…
View article: Rate constant for the reaction of hydroxyl radical with formaldehyde over the temperature range 228–362 K
Rate constant for the reaction of hydroxyl radical with formaldehyde over the temperature range 228–362 K Open
Absolute rate constants for the reaction OH+H2CO have been measured over the temperature range 228–362 K using the flash photolysis–resonance fluorescence technique. The results were independent of variations in [H2CO], total pressure [Ar]…
View article: Absolute rate of the reaction of hydrogen atoms with ozone from 219–360 K
Absolute rate of the reaction of hydrogen atoms with ozone from 219–360 K Open
Absolute rate constants for the reaction of atomic hydrogen with ozone were obtained over the temperature range 219–360 K by the flash photolysis–resonance fluorescence (FP–RF) technique. The results can be expressed in Arrhenius form by k…
View article: Absolute rate of the reaction of bromine atoms with ozone from 200 to 360 K
Absolute rate of the reaction of bromine atoms with ozone from 200 to 360 K Open
The rate constant for the reaction Br+O3→BrO+O2 has been measured from 200 to 360 K by the technique of flash photolysis coupled to time resolved detection of bromine atoms by resonance fluorescence (FP–RF). Br atoms were produced by the f…
View article: Absolute rate of the reaction of atomic hydrogen with ethylene from 198 to 320 K at high pressure
Absolute rate of the reaction of atomic hydrogen with ethylene from 198 to 320 K at high pressure Open
The rate constant for the H+C2H4 reaction has been measured as a function of temperature. Experiments were performed with high pressures of Ar heat bath gas at seven temperatures from 198 to 320 K with the flash photolysis–resonance fluore…
View article: Absolute rate constant for the reaction of atomic chlorine with hydrogen peroxide vapor over the temperature range 265–400 K
Absolute rate constant for the reaction of atomic chlorine with hydrogen peroxide vapor over the temperature range 265–400 K Open
Rate constants for the reaction of atomic chlorine with hydrogen peroxide have been measured from 265 to 400 K using the flash photolysis–resonance fluorescence technique. Analytical techniques were developed to measure [H2O2] under reacti…
View article: Absolute rate parameters for the reaction of atomic hydrogen with carbonyl sulfide and ethylene episulfide
Absolute rate parameters for the reaction of atomic hydrogen with carbonyl sulfide and ethylene episulfide Open
Absolute rate constants for the reaction of atomic hydrogen with carbonyl sulfide H+OCS→SH+CO (1) and ethylene episulfide H+C2H4S→SH+C2H4 (2) have been determined using the flash photolysis–resonance fluorescence technique. Under condition…
View article: Absolute rate of the reaction of Cl(2P) with molecular hydrogen from 200–500 K
Absolute rate of the reaction of Cl(2P) with molecular hydrogen from 200–500 K Open
Rate constants for the reaction of atomic chlorine with hydrogen are measured from 200 - 500 K using the flash photolysis-resonance fluorescence technique. The results are compared with previous work and are discussed with particular refer…
View article: Chemical Evolution of Dense Clouds
Chemical Evolution of Dense Clouds Open
Thermal reactions largely determine the chemical evolution of interstellar molecules during various phases associated with the evolution of interstellar clouds. A similar mechanism may be the source of the array of observed polyatomic mole…
View article: The photochemistry of interstellar molecules.
The photochemistry of interstellar molecules. Open
The photochemistry of two diatomic and eight polyatomic molecules is discussed quantitatively. For an interstellar molecule, the lifetime against photodecomposition depends upon the absorption cross section, the quantum yield or probabilit…
View article: Photochemistry and Lifetimes of Interstellar Molecules
Photochemistry and Lifetimes of Interstellar Molecules Open
A quantitative discussion is presented of the lifetime against photodecomposition, or the probability of photodecomposition, of interstellar molecules. In addition to photodissociation, molecules can also be destroyed by interaction with h…
View article: Photolysis of Formaldehyde at 1470 and 1236 Å
Photolysis of Formaldehyde at 1470 and 1236 Å Open
The photolysis of formaldehyde vapor has been examined at 1470 and 1236 Å. Mixed isotope (H2CO+D2CO) and radical scavenger (C2D4) experiments have been utilized in addition to inert gas pressurization and lamp intensity attenuation. The qu…
View article: Comment on “Xenon Sensitized Photolysis of Carbon Dioxide”
Comment on “Xenon Sensitized Photolysis of Carbon Dioxide” Open
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View article: Vacuum-Ultraviolet Photochemistry. VII. Photolysis of Hydrazine at 1236 and 1470 Å
Vacuum-Ultraviolet Photochemistry. VII. Photolysis of Hydrazine at 1236 and 1470 Å Open
The photolysis of hydrazine vapor has been investigated at 1236 and 1470 Å. At 1236 Å, fluorescence is observed at 3360 Å and is attributed to the NH(A3π→X3Σ−) transition. The emission has been studied as a function of pressure and photoly…