Time-Integrated Spectrum of a Radiatively Cooling Planckian Emitter
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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This paper investigates the effect of cooling a hot Planckian emitter upon its fluence spectrum. A sequence of models of increasing complexity is developed to determine the effects of various aspects of cooling upon the spectrum, such as initial temperature, density, and ionization state of the plasma. Spectra are calculated for radiating plasmas composed of different atomic number materials carbon, aluminum, copper, and plutonium at initial temperatures of 0.02 - 10 KeV, and initial densities of 1E25 - 1E29 atomsm3, to observe the effects of these parameters on the fluence spectrum. The change in material and binding energy for some spectra at the low energy end produces a second, prominent but smaller peak. The resulting non-Planckian spectra can be approximated with two or more Planckian basis functions having different temperatures. Theses.
- Atomic and Molecular Physics and Spectroscopy