Abstract
Molecular hydrogen is a benchmark system for bound state quantum calculation and tests of quantum electrodynamical effects. While spectroscopic measurements on the stable species have progressively improved over the years, high-resolution studies on the radioactive isotopologues , and have been limited. Here we present an accurate determination of T2 transition energies in the fundamental vibrational band of the ground electronic state, by means of high-resolution coherent anti-Stokes Raman spectroscopy. With the present experimental uncertainty of , which is a fivefold improvement over previous measurements, agreement with the latest theoretical calculations is demonstrated.
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