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  • 1
    Electronic Resource
    Electronic Resource
    Resonance luminescence of a nonuniformly heated dense vapor (1997)
    Springer
    JETP letters 65 (1997), S. 13-18 
    Details
    ISSN: 1090-6487
    Keywords: 33.50.Dq ; 44.40.+a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal luminescence spectra of a dense, nonuniformly heated resonance medium (sodium vapor) are investigated experimentally under conditions when the resonance corrections to the relative permittivity are not small compared to unity and the photon mean free path is comparable to the wavelength of the radiation. The shape of the recorded spectra agrees well with a previously developed general theory of resonance radiation transfer which predicts a strong asymmetry of the spectra. The prospects for performing more-sensitive measurements in order to make a quantitative check of the theoretically predicted anomalous intensity (an order of magnitude higher than in the standard theory of resonance radiation transfer) of the radiation from a dense nonuniform medium are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567326
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Boltzmann spectral distribution or “infrared catastrophe” in the resonance radiation of a gas (1997)
    Springer
    JETP letters 65 (1997), S. 839-844 
    Details
    ISSN: 1090-6487
    Keywords: 52.25.Rv ; 51.70+f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The purely thermal infrared emission spectra of a resonance medium (sodium vapor) are investigated experimentally. It is shown that the emission intensity in the 2–3 μm range at temperatures of 600–1200 K is several orders of magnitude higher than the intensity obtained from the standard theory of resonance radiation transfer. This phenomenon can be conventionally termed an “infrared catastrophe.” The form of the recorded spectra and the absolute intensity of the emission in both the infrared and visible regions of the spectrum are in agreement with the theory developed by Yu. L. Zemtsov and A. M. Starostin, Zh. Éksp. Teor. Fiz. 103, 345 (1993) [JETP 76, 186 (1993)], in which the Boltzmann spectral distribution of the population of the resonance level is proportional to exp(−ħω/T).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567434
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Formation mechanisms and structure of the luminescence spectra of a dense resonant medium (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 76-86 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The purely thermal visible and infrared radiation emitted by a dense resonant medium (sodium vapor) heated nonuniformly to temperatures of 600–1200 K was investigated experimentally for the first time under conditions where the photon mean free path is comparable with the emission wavelength. The profile of the recorded spectra and the absolute luminescence intensities in the different spectral ranges show good agreement with the results of a numerical simulation using a previously developed theory of resonance radiation transport which assumes a Boltzmann spectral distribution of the resonant level population proportional to exp(−ℏω/T). The self-reversed resonant sodium line exhibited strong asymmetry and it was shown that under certain conditions, the luminescence spectrum of the medium may exhibit an additional broad peak on the far “red” limb of the resonance line. Calculations and measurements demonstrated that the intensity of the thermal emission of sodium vapor at this red peak is several orders of magnitude higher than that obtained from the standard theory of resonance radiation transport. This effect is arbitrarily termed an infrared “ catastrophe.” It is noted that in a solar corona plasma and in gas-discharge lamps, the far red limbs of the resonant lines may make a substantial contribution to the total luminescence intensity and in some cases, considerably exceed the intensity of the photorecombination and bremsstrahlung continuum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558628
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    Paper (German National Licenses)
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