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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

X¹Σ_g⁺ a³Π_u b³Σ_g^- A¹Π_u c³Σ_u⁺ d³Π_g C¹Π_g e³Π_g D¹Σ_u⁺ E¹Σ_g⁺ f³Σ_g^- g³Δ_g F¹Π_u