Beryllium Deuteride Spectra

Abstract

The spectra of the BeD green bands and of the ultraviolet Be${\mathrm{D}}^{+}$ bands have been photographed at high dispersion. A Be arc in a deuterium atmosphere was the source. Rotational analyses of the BeD bands, and rotational and vibrational analyses of the Be${\mathrm{D}}^{+}$ bands are presented. The electronic isotope shift in the ultraviolet system is 0.8 ${\mathrm{cm}}^{-1\mathrm{}}$. The values ${B_e}^{*}=5.6807\mathrm{}$ for the lower state of BeD and ${B_e}^{*}=5.9546\mathrm{}$ for the lower state of Be${\mathrm{D}}^{+}$ are found. Comparison of these values with the corresponding values of the hydrides gives ratios 0.55110 and 0.55073, respectively, whereas ${\rho }^2=0.55060\mathrm{}$. Calculation of the J. L. Dunham corrections to $B_e$ for the anharmonic oscillator are shown to affect the $B_e$ ratio inappreciably. The variation of the ratio of the ${B_e}^{*}\text{'}\mathrm{s}$ from ${\rho }^2$ and the small electronic isotope shift are briefly discussed.