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  • 1
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    Three-dimensional model of collision-induced vibrational transitions in homonuclear diatomic molecules (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Collision induced homonuclear diatomic molecules vibrational excitation using three dimensional model, obtaining transition cross sections and relaxation rates as function of temperature
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
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  • 2
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    Semiclassical theory of vibrational excitation for diatomic molecules with conserved collision energy (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Inelastic collision effects on vibrational excitation of diatomic molecules with conserved energy
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: ; YAL SOCIETY (
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  • 3
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    Channel flow of gaseous mixtures in chemical and thermodynamic nonequilibrium. (1967)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Monatomic and diatomic gas mixture channel flow with chemical and thermodynamic nonequilibrium, noting high enthalpy hypersonic nozzle air flow
    Keywords: AERODYNAMICS
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  • 4
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    New thermodynamic functions for the C3 molecule. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: When graphite is used as ablation material in heat shields, very often a prominent carbon species vaporized into the stream is C3. The thermodynamic properties of the C3 molecule are, therefore, important in calculating transport phenomena in the ablation flow field. The nature of the C3 thermodynamic functions has been in doubt because of the uncertain contribution of the bending mode vibrations to the total internal energy of the molecule. An approach for overcoming these difficulties is considered. The results of the computations are presented in the form of graphs and approximating functions.
    Keywords: CHEMISTRY
    Type: AIAA Journal; 11; Aug. 197
    Format: text
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  • 5
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    A quantum model for bending vibrations and thermodynamic properties of C3. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The investigation reported was conducted to clarify the thermodynamic properties of C3 by further developing the limit to the partition function suggested by Strauss and Thiele (1967). A quantum solution for the energy levels of a quadratically perturbed square well potential is presented and the consistency of this limit with observed energy levels is established. In the process a more complete physical picture of the bending C3 molecules emerges. The values of entropy deduced from various measurements of graphite pressure are compared with this limit, and the thermodynamic properties predicted for the limiting case are evaluated.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Canadian Journal of Physics; 51; Apr. 1
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  • 6
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    Effects of curvilinear motion in large-amplitude bending of C3 (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The geometry of the bending of a linear triatomic molecule is analyzed, and an expression for the average rotational constant is derived. A harmonic oscillator model of C3 is fitted to the observed rotational constant within 0.6%. The bond distance between atoms at zero bending is 1.287 A according to this model; this is noticeably larger than the average internuclear distance of 1.277 A for the vibrational ground state. The first order perturbation solutions for the vibrational energy levels, taking into account the effect of a quartic perturbation potential, closely match observed levels. For a square well potential model of C3, the effect of curvilinear motion in bending is similar to that found for the harmonic oscillator model, though the decreases in energy are about twice as large. In both models, the average energy decrease is relatively constant at approximately 10% over a wide range of vibrational quantum number.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 60; Feb. 1
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  • 7
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    A method for computing nonequilibrium channel flow of a multicomponent gaseous mixture in the near-equilibrium region (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Nonequilibrium channel flow of multicomponent gaseous mixture in near-equilibrium region - numerical formulation
    Keywords: FLUID MECHANICS
    Type: NASA-TN-D-3306
    Format: application/pdf
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  • 8
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    Shuttle APS propellant thermal conditioner study (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study program was performed to allow selection of thermal conditioner assemblies for superheating O2 and H2 at supercritical pressures. The application was the auxiliary propulsion system (APS) for the space shuttle vehicle. The O2/H2 APS propellant feed system included propellant conditioners, of which the thermal conditioner assemblies were a part. Cryogens, pumped to pressures above critical, were directed to the thermal conditioner assembly included: (1) a gas generator assembly with ignition system and bipropellant valves, which burned superheated O2 and H2 at rich conditions; (2) a heat exchanger assembly for thermal conditioning of the cryogenic propellant; and (3) a dump nozzle for heat exchanger exhaust.
    Keywords: PROPELLANTS
    Type: NASA-CR-115363 , REPT-8665-950002
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  • 9
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    Collision induced rotational transition probabilities in diatomic molecules (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: International Symposium on Rarefied Gas Dynamics; Jul 10, 1972 - Jul 14, 1972; Stanford, CA
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  • 10
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    Transport properties of N2 gas at cryogenic temperatures (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The viscosity and thermal conductivity of nitrogen gas for the temperature range 5 K - 135 K have been computed from the second Chapman-Enskog approximation. Quantum effects, which become appreciable at the lower temperatures, are included by utilizing collision integrals based on quantum theory. A Lennard-Jones (12-6) potential was assumed. The computations yield viscosities about 20 percent lower than those predicted for the high end of this temperature range by the method of corresponding states, but the agreement is excellent when the computed values are compared with existing experimental data.
    Keywords: PHYSICS, GENERAL
    Type: NASA-TN-D-7565 , A-5327
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