Abstract
We performed a study of rovibrational energy levels of the H ̄ 1Σ + g and B ̄ 1Σ + u states in HD in a three-photon experiment involving extreme ultraviolet (XUV), visible, and ultraviolet laser radiation. An analysis of level shifts with respect to adiabatic energies, deduced from level energies in H 2 and D 2, shows strong non-adiabatic interaction between these two states, implying complete g– u symmetry breaking over a wide range of v and J quantum numbers.
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