Calculation of Constants for Band Spectra

Abstract

IT has not infrequently proved difficult in the analysis of spectra to decide which of two or more sets of constants refer to the deepest-lying energy states: an example of this arose in my experience in the interpretation of Gale and Monk's work on the fluorine di-atom FF. Empirical methods of obtaining these numbers for ground states may therefore be useful. It is already possible on the basis of the periodic classification of di-atoms¹ to form estimates of such numbers in many cases. The fundamental nuclear vibration frequency _e is one of the most important of these constants, since it enters into the expressions for other numbers. Methods by which the equilibrium internuclear distance r_e may be obtained from _e have been recently improved².