Vibrational Analysis of the Emission Bands of Germanous Oxide

Twenty-one bands degraded to the red and associated with GeO have been observed in the region $\lambda 2500$ to $\lambda 2900$ The wave numbers of the band heads are expressed by the equation $\nu =37763.7+649.4\mathrm{} (v^{\prime }+\frac{1}{2})-3.81\mathrm{} {(v^{\prime }+\frac{1}{2})}^2-985.0\mathrm{} (v^{\prime \prime }+\frac{1}{2})+4.36\mathrm{} {(v^{\prime \prime }+\frac{1}{2})}^2.$ Attention is called to the regular variation of the dissociation energies for the normal states of the monoxides and monosulphides of the fourth periodic column. It is shown that the electronic transition ${}_{}{}^1{}_{}{}^{}\Pi \to {}_{}{}^1{}_{}{}^{}\Sigma$ for the GeO system seems to agree best with the available evidence. It is found that the quantity ${{\omega }_e}^{\prime \prime }{r_e}^2·{10}^{-16\mathrm{}}$ cm is very nearly constant for the fourth column monoxides. From this it is concluded that 1.65±0.06A is a good value of $r_e$ for GeO. The dense structure due to overlapping bands and isotope effect makes rotational analysis extremely difficult.