OSCILLATOR STRENGTHS OF THE $v' = 5-13; v = 1, 2$ BANDS OF THE SCHUMANN-RUNGE BAND SYSTEM

A technique for measuring the effect of temperature on the characteristics of the Schumann-Runge band system has been discussed in a previous $paper.^{1}$ The design of the apparatus described enables the relative populations in the ground state, $X ^{3}\\Sigma^{-}_{g}$ to be calculated with an estimated accuracy of $\\pm 1$\\%. It has been possible therefore to compare the intensity of the absorption bands and to obtain relative oscillator strengths. Within experimental error these measurements are in agreement with relative Franck-Condon factors as calculated by $Nicholls.^{2}$ Assuming the results of $Bethke^{3}$ for the $v^{1} = 2-17; v'' = 0$ bands are correct, absolute oscillator strengths for $v^{1} = 5-15, v'' = 1, 2$ have been calculated.