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  • 1
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    Rate parameters for coupled vibration-dissociation in a generalized SSH approximation (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Thermophysics and Heat Transfer (ISSN 0887-8722); 6; 9-21
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    NEQAIR96,Nonequilibrium and Equilibrium Radiative Transport and Spectra Program: User's Manual (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This document is the User's Manual for a new version of the NEQAIR computer program, NEQAIR96. The program is a line-by-line and a line-of-sight code. It calculates the emission and absorption spectra for atomic and diatomic molecules and the transport of radiation through a nonuniform gas mixture to a surface. The program has been rewritten to make it easy to use, run faster, and include many run-time options that tailor a calculation to the user's requirements. The accuracy and capability have also been improved by including the rotational Hamiltonian matrix formalism for calculating rotational energy levels and Hoenl-London factors for dipole and spin-allowed singlet, doublet, triplet, and quartet transitions. Three sample cases are also included to help the user become familiar with the steps taken to produce a spectrum. A new user interface is included that uses check location, to select run-time options and to enter selected run data, making NEQAIR96 easier to use than the older versions of the code. The ease of its use and the speed of its algorithms make NEQAIR96 a valuable educational code as well as a practical spectroscopic prediction and diagnostic code.
    Keywords: Atomic and Molecular Physics
    Type: NASA-RP-1389 , A-962456 , NAS 1.61:1389
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Two-temperature interpretation of dissociation rate data for N2 and O2 (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The existing experimental data on dissociation of nitrogen and oxygen obtained using shock-tubes during the 1960's and 1970's are reinterpreted using the two-temperature thermo-chemical model developed recently in order to determine the rate coefficients consistent with the model. In this model, the vibrational-electronic temperature is calculated by integrating a separate conservation equation accounting for the suppression of vibrational energy during dissociation due to preferential removal of high vibrational states. The rate coefficient is assumed to be a function of the geometrically-averaged temperature between the translational-rotational temperature and the vibrational-electronic temperature. By comparing the computed overall and species densities with the experimental data, the rate coefficient values most consistent with the model, and their ranges of uncertainty, are deduced for dissociation of N2 through collisions with N2 or N, and for O2 through collisions with O2, O or N2. It is seen that a single set of such rate coefficients fit all existing experimental data closely. According to the two-temperature model, density and species density are insensitive to the rate coefficients, and so the rate coefficients so determined are uncertain to within a factor of at least 1.5.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: AIAA PAPER 88-0458
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Augmenting Transition Probabilities for Neutral Atomic Nitrogen (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The transition probability values for a number of neutral atomic nitrogen (NI) lines in the visible wavelength range are determined in order to augment those given in the National Bureau of Standards Tables. These values are determined from experimentation as well as by using the published results of other investigators. The experimental determination of the lines in the 410 to 430 nm range was made from the observation of the emission from the arc column of an arc-heated wind tunnel. The transition probability values of these NI lines are determined to an accuracy of +/- 30% by comparison of their measured intensities with those of the atomic oxygen (OI) multiplet at around 615 nm. The temperature of the emitting medium is determined both using a multiple-layer model, based on a theoretical model of the flow in the arc column, and an empirical single-layer model. The results show that the two models lead to the same values of transition probabilities for the NI lines.
    Keywords: Atomic and Molecular Physics
    Format: text
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    NASA TECHNICAL REPORTS
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