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Atomic Species Spectroscopic Constants Molecular Species Spectroscopic Constants

H₂ H₂⁺ H₂^- C₂ C₂⁺ C₂^- CH CH⁺ CH^- CN CN⁺ CN^- CO CO⁺ CO^- CO₂ CO₂⁺ N₂ N₂⁺ N₂^- NH NH⁺ NH^- NO NO⁺ NO^- O₂ O₂⁺ O₂^- OH OH⁺ OH^-

Electronic Levels Bound-Bound Transitions Bound-Free Transitions Free-Free Transitions

X²Π_r A²Σ⁺ B²Π_r C²Π_r D²Σ⁺ B'²Δ_i E²Σ⁺ F²Δ H²Π H'²Π G²Σ^- M²Σ⁺ S²Σ⁺ N²Δ 4f O²Σ⁺ O'²Π 5f Y²Σ⁺ Z²Σ⁺