Spectral emission from MHD combustion gas mixed with pulverized coal

The spectral emission from MHD combustion gas mixed with pulverized coal was measured between 0.38 and 2.7 μm. Twenty lines of K, eight lines of Li, Na, Rb, and Ca, and two molecular spectra of calcium compounds were observed. The experimental line shape for the 4P-4S transition of K agreed well with the Lorentzian shape combined with the measured farwing absorption cross sections. The population temperature of the K electronic state in the optically thin limit agreed well with the wing-reversal temperature. Continuous emission from coal-ash particles was not observed.