The electronic spectrum of magnesium hydride and magnesium deuteride

Abstract

The absorption spectra of MgH and MgD have been examined under high resolution and several new features observed. In the A2 Pi -x2 Sigma + transition the 0P12 satellite branch has been identified and assigned for both molecules. Measurements on the C2 pi -x2 sigma + system of MgH indicate that the C state is inverted with A= -3.7 cm-1. The MgD absorptions at 236.4 nm and 236.0 nm, previously considered to belong to independent electronic transitions, have been shown to be, respectively, the P and Q heads of the 1-0 band of the C2 Pi -x 2 Sigma + system. Rotational analysis yields the following constants for the C2 Pi state of MgD; Be=3.256 cm-1, De=9.2*10-5 cm-1, beta e=0.25*10-5 cm-1, re=0.1669 nm and Delta G(1/2)=1140.1 cm-1.