Spectroscopic identification of rovibronic levels lying above the potential barrier of the E F 1Σ+g double-minimum state of the H2 molecule

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Abstract
Spectroscopic data on the higher vibrational levels of the EF 1Σ+g state of the H2 molecule are scarce. Here we report new identifications of energy levels with J=0–5 which fall into the range between vEF=9 and 20, i.e., the energy region above the potential barrier of the double‐minimum EF potential curve. Some previously published line assignments and term values are hereby corrected. The results are mostly based on new assignments of EF 1Σ+g–B 1Σ+u bands in Dieke’s hydrogen molecule wavelength tables published in 1972. The newly identified states are of interest in multiphoton spectroscopy and in comparisons of experimental properties with results of ab initio calculations.