B¹Σ⁺ᵤ and EF¹Σ⁺g level energies of D₂

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Accurate absolute level energies of the B¹Σ⁺ᵤ, v=0-8, N and EF¹Σ⁺g, v=0-21, N rovibrational quantum states of molecular deuterium are derived by combining results from a Doppler-free two-photon laser excitation study on several lines in the EF¹Σg⁺-X¹Σg⁺ (0,0) band, with results from a Fourier-transform spectroscopic emission study on a low-pressure hydrogen discharge. Level energy uncertainties as low as 0.0005 cm⁻¹ are obtained for some low-lying E¹Σ⁺g inner-well rovibrational levels, while uncertainties for higher-lying rovibrational levels and those of the F¹Σ⁺g outer-well states are nominally 0.005 cm⁻¹. Level energies of B¹Σ⁺ᵤ rovibrational levels, for v ≤ 8 and N ≤ 10 are determined at an accuracy of 0.001 cm⁻¹. Computed wavelengths of D₂ Lyman transitions in the B¹Σ⁺ᵤ-X¹Σ⁺g (v,0) bands are also tabulated for future applications.