Fourier transform spectroscopy analysis of the 3d-triplet complex visible emission spectra of H2

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Abstract
An investigation of the triplet 3d‐complex of H2, the g(3d) 3Σ+g, i(3d) 3Πg, and j(3d) 3Δg and the nearby h(3s) 3Σ+g electronic states, has been performed. The 3s,3d→c (2p) 3Π−u visible emission spectra have been obtained with a low pressure discharge lamp and recorded with a Fourier transform spectrometer. Transition wave numbers and rotational energy levels are given for v=0–3 of the four states. An effective Hamiltonian is used to fit the data, which shows the rotational breakdown of the Born–Oppenheimer approximation due to the L‐uncoupling effect. The eigenvectors obtained from this model provide considerable insight into the nature of the 3d‐complex. Furthermore, the model shows the mixing between the 3d states and the h(3s) 3Σ+g state which is particularly strong for lower v values. Molecular constants, coupling parameters, and term values are also given.

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