The electric dipole moment of magnesium deuteride, MgD.

The (0,0) A²Π-X²S+ band of a cold molecular beam sample of magnesium monodeuteride, MgD, has been recorded field-free and in the presence of a static electric field of up to 11 kV/cm. The lines associated with the lowest rotational levels are detected for the first time. The field-free spectrum was analyzed to produce an improved set of fine structure parameters for the A²Π (v = 0) state. The observed electric field induced splittings and shifts were analyzed to produce permanent electric dipole moments, μel 2.567D and 1.31D for A²Π (v = 0) and X²Σ+(v = 0) states, respectively. The recommended value for μelX²Σ+ (v = 0)) for MgH, based upon the measured value for MgD, is 1.32D. [ABSTRACT FROM AUTHOR]