RADIATIVE TRANSFER IN A GAS OF UNIFORM PROPERTIES IN LOCAL THERMODYNAMIC EQUILIBRIUM. PART 2. RELATIVE LINE INTENSITIES AND THE TREATMENT OF WEAK LINES
BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
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The report is concerned with the transfer of radiative energy by the lines of a gas of uniform properties in local thermodynamic equilibrium. By means of comparatively simple calculations, the relative intensities of the potentially strong lines of a simple hydrogenic spectrum are computed and these results are interpreted in detail. An important conclusion from these calculations is that the influences of lower state occupation number and line oscillator strength can, under some conditions, be outweighed by factors such as the line width and the local value of the Planck function. The remainder of the report is concerned with the numerous weak lines associated with high quantum numbers. It is shown that these lines can be allowed for by extending the cross sections of the appropriate continuum processes. These techniques are then used to compare the intensities of groups of weak lines with the intensities of certain strong lines.
- Fluid Mechanics