Spectroscopic identification of the lowest rotation-vibration levels of the (2pσ)2 F 1Σ+g state of the H2 molecule

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Abstract
Many lines in the infrared emission spectrum of the hydrogen molecule are still unidentified. We report here the identification of a number of such lines corresponding to transitions from the lowest two vibrational levels, v=0 and v=1, of the (2pσ)2 F 1∑+g state of H2. Intensity distributions observed in the bands of the F 1∑+g−B 1∑+u system are consistent with theory. New or more accurate rotational term values are also found for the v=2–4 levels of the F state, and molecular constants are reported. The rotation‐vibration structure of the F state (v=0–4; J=0–5) is in good agreement with accurate ab initio calculations which include the effects of tunneling in the double‐minimum potential function of the EF state as well as nonadiabatic effects.