RADIATIVE TRANSFER IN A GAS OF UNIFORM PROPERTIES IN LOCAL THERMODYNAMIC EQUILIBRIUM. PART 3. A DETAILED CALCULATION FOR NITROGEN
BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
Pagination or Media Count:
The spectral lines are classified into various groups and the contribution of each group to the overall radiation from the gas is distinguished. The reduction in line intensity due to the background continuum is allowed for. The intensity due to a combination of up to 18 types of continuum and pseudo-continuum processes is computed with exact allowance for self-absorption. The results for the total intensity and the relative contributions of selected groups of contributors are presented graphically. In addition, an equivalent gray gas absorption coefficient is defined and the values presented. The results of the calculation demonstrate that, in most cases, the atomic and ionic lines are the most important contributors. When the gas is highly ionized, the dominant contributors are a few strong lines arising from same-shell transitions which have low-lying initial energy levels and are situated in the near ultra violet. A further interesting and unexpected result is that the intensities of the strongest lines are often significantly influenced by Doppler broadening of the line profiles.
- Fluid Mechanics