New Experimental Determination of Effective Cross-Sections for the Quenching of Mercury Resonance Radiation

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Abstract
Theory of the quenching of resonance radiation. The problem of the quenching of resonance radiation by foreign gases is treated on the basis of Milne's theory of diffusion of radiation extended to take account of (1) a collimated incident beam, (2) a finite emission line, (3) a finite absorption line, (4) impacts of the second kind, and a curve is obtained from which one can find the number of impacts of the second kind corresponding to any experimentally observed value of the quenching. The effect of metastable atoms is discussed and a theory of their behavior outlined.