Theoretical electric dipole moments of SiH, GeH and SnH

Abstract

Accurate theoretical dipole moments (μ e) have been computed for the X 2Π ground states of Si − H + (0.118 D), Ge + H − (0.085 D) and Sn +H − (0.357 D). The trend down the periodic table is regular and follows that expected from the electronegativities of the group IV atoms. The dipole moment of 1.24 ± 0.1 D for GeH recently derived by Brown, Evenson and Sears from the relative intensities of electric and magnetic dipole transitions in the 10 μm spectrum of the X 2Π state is seriously questioned.