Relation between Pressure Shift, Temperature Glass, and Spectral Terms

Abstract

IN a letter to NATURE of June 21, p. 889, I have shown the existence of a numerical relation between the pressure displacements of the lines of the iron spectrum, the temperature class of the lines, and the magnitude of the spectral terms which originate those lines by combination. It now seems probable that this relation is not only valid for iron, but may be a more general relation. Unfortunately, the available measures of temperature and pressure effects are neither very numerous nor very extensive, so that the general validity of the relation cannot at present be fully demonstrated. In a few cases, however, the available measures suffice to show that the relation holds very accurately.