Intensities of electric dipole forbidden rotation and rotation–vibration transitions in D2+

A full account of calculations of the electric dipole forbidden pure rotation and rotation–vibration transitions in the ground electronic state (1sσg) of D2+ is presented. The transitions have measurable intensity because of ortho–para mixing that arises from electronic g/u symmetry breaking caused by the Fermi contact hyperfine interaction. The transition moments for the most significant of these transitions (in the region 0.3…1000 cm−1) are determined to be between 5 × 10−3 and 7 × 10−6 ea0.