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  • 1
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The crossed-beam method was used to investigate the charge–transfer reaction of Ar+(2P3/2) with Ar(1S0) as a function of collision energy over the range of 2–100 eV (center of mass). Both the exactly resonant channel and the endoergic fine-structure transition with ΔJ=1 were detected and the cross section ratio σ3/2→1/2/(σ3/2→1/2+σ3/2→3/2) was found first to increase with increasing collision energy to a maximum value of about 0.5 at 30 eV and then decrease at higher energy. The relative abundance of the fine-structure transition channel at low energy is much higher than that predicted by the accepted general theory for these processes. It is suggested that a curve-crossing mechanism not previously considered and the perturbation of trajectories at low energies resulting from the strongly bound Ar+2 intermediate may be responsible for the unexpected observations.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A new research apparatus for characterization of low-pressure premixed flames has been developed. This instrument incorporates several spectral techniques in one apparatus so that various diagnostic techniques can be quantitatively compared and the usable detection range expanded. Features include detection by mass analysis with a triple quadrupole mass spectrometer and by laser techniques such as laser-induced fluorescence. Temperature profiles of the flame both with and without the mass spectrometer probe were obtained by thermocople. Concentration profiles of the highly reactive flame species H·, O, and OH· were obtained and compared.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Flame-spreading processes during the ignition of ballistic events have long been studied by pressure measurements and visual records from high-speed film. While optical temperature measurements have been utilized, they are not useful much below 1500 K. A fine-wire platinum versus 10% Rh/platinum thermocouple probe was designed to measure gas temperature in a packed propellant bed over the range from the initial bed temperature (295 K) to more than 2000 K. Probe mounts were designed to provide sufficient physical support and protection for the thermocouples and yet minimally perturb the flow environment. Three diameters of fine-wire thermocouples were tested for survivability and time response in the simulated pressure-wave environment of ignition of a propellant bed. The largest diameter thermocouple (3 mil or 76 μm) exhibited a response time too great (3 ms). The smallest diameter (1 mil or 25 μm) exhibited the shortest response time (0.4 ms) and would be the thermocouple of choice for this experiment; however, it was not used in the current experiments due to difficulties in probe fabrication and consideration of wire strength. For this application, a 2 mil (51 μm) diameter thermocouple was chosen. The lag time for this thermocouple was estimated at approximately 1.5 ms. Corrections to the temperature for catalytic activity (〈1 K) and radiative cooling (60 K in the plateau region) were estimated. Examples of temperature histories during ignition of M30A1 and M43 propellants are also included. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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