Abstract
AbstractThe normal spectral emissivity of W, Ta—50 W, and Ta is calculated in the wavelength range 0.35 to 2.3 μm for the temperature 2400 °K using literature values of the electronic density of states for W. At the wavelength 0.57 μm calculations are made for the temperatures 2800 and 2000 °K. The calculations follow the theory of radiative energy transfer in gases and the theory of Einstein's transition probabilities. The matrix element of the electron—phonon interaction is used for the comparison of the theoretical and experimental results. The calculated temperature coefficient of the emissivity has the correct sign.
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