ABSTRACT
High power radiation is very useful in many applications. The spectral radiance of high-pressure light sources being operated in a TE state cannot exceed that of the black body of the same temperature. In general, when a density of free electrons in a plasma is higher than about I 023/m3, a continuous spectrum cannot be negligible as compared with a line spectrum. Such high electron densities are easily produced in high-pressure alkali vapors at 5000 to 8000 K, and in rare gases with filling pressure of 1 to 100 kPa at higher temperatures than about 10000 to 30000 K respectively. In addition, intensified ionic lines can be expected for some emissive species. Spectral properties of plasmas having very high electronic densities are investigated.
