Journal ArticleDOI
Lyman‐α absorption photometry at high pressure and atom density kinetic results for H recombination
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TLDR
In this paper, the calibration of a Lyman-α photometer for measurement of absolute hydrogen atom concentrations at levels [H] ι ≤ 1.8 × 1014 atoms/cm2 and total pressure of 1.5 torr He is described.Abstract:
Atomic absorption and fluorescence spectrophotometry have been routinely used in kinetic investigations as probes of relative, rather than absolute, atom concentration. The calibration of a Lyman-α photometer for measurement of absolute hydrogen atom concentrations at levels [H] ι ≤ 1.8 × 1014 atoms/cm2 and total pressure of 1.5 torr He is described. The photometer is characterized in terms of a two-level emission source and an absorption region in which only Doppler broadening of the transition is considered. The modifications due to pressure broadening by high pressures (500 ≤ P ≤ 1500 torr) in the absorption region are discussed in detail. Application of the technique is reported for the recombination of hydrogen atoms in the presence of six nonreactive heat bath gases. Experiments were performed in a static reaction cell at pressures of 500–1500 torr of heat bath gas, and hydrogen atoms were produced by Hg (3P1) photosensitization of H2. The technique is critically evaluated and the mechanistic implications of the hydrogen atom recombination results are examined. The measured room temperature recombination rate constants in H2, He, Ne, Ar, Kr, and N2 are 8.5 ± 1.2, 6.9 ± 1.5, 5.9 ± 1.5, 8.0 ± 0.8, 10.2 ± 0.9, and 9.6 ± 1.4, respectively, where the units are 1033 cm6/molec2 · sec.read more
Citations
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Rate Constants For H + O2 + M → HO2 + M in Seven Bath Gases
TL;DR: In this paper, the average energy change per collision, −ΔEall, was derived for all species of H2O, except for H 2 O and N 2.
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Thermal rate constants for the Cl+H2 and Cl+D2 reactions between 296 and 3000 K
TL;DR: In this paper, rate constants for the Cl+H2 and D2 reactions have been measured at room temperature by the laser photolysis-resonance absorption (LP•RA) technique.
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The thermal decomposition of C2H5I
TL;DR: In this article, the high-temperature thermal dissociation of C2H5I has been characterized using the atomic resonance absorption spectrometric technique (ARAS) for the temporal detection of both product H and I atoms behind reflected shock waves.
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Femtosecond, two-photon-absorption, laser-induced-fluorescence (fs-TALIF) imaging of atomic hydrogen and oxygen in non-equilibrium plasmas
Jacob B. Schmidt,Sukesh Roy,Waruna D. Kulatilaka,Ivan Shkurenkov,Igor Adamovich,Walter R. Lempert,James R. Gord +6 more
TL;DR: In this article, femtosecond, two-photon absorbing laser-induced fluorescence (fs-TALIF) is employed to measure space and time-resolved distributions of atomic hydrogen and oxygen in moderate-pressure, non-equilibrium, nanosecond-duration pulsed-discharge plasmas.
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Experimental study and modeling of dodecane ignition in a diesel engine
Krikor Sahetchian,Jean-Claude Champoussin,M. Brun,N. Levy,N. Blin-Simiand,C. Aligrot,F. Jorand,M. Socoliuc,Adolphe Heiss,N. Guerassi +9 more
TL;DR: In this paper, a motored diesel engine running under conditions close to ignition but avoiding it was investigated. But the experimental results showed that, during the ignition delay, reactions occurred first at the boundary of the fuel spray.
References
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Journal ArticleDOI
Broadening and Shift of Spectral Lines Due to the Presence of Foreign Gases
Shang-Yi Ch'en,Makoto Takeo +1 more
Journal ArticleDOI
Intermolecular Potentials from Crossed-Beam Differential Elastic Scattering Measurements. IV. Ar+Ar
TL;DR: In this article, high-resolution low-energy elastic differential cross sections have been measured for Ar-Ar over a wide angular range and Rainbow structure as well as symmetry oscillations at wide angels were resolved.
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