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Molecular hydrogen is a benchmark system for bound state quantum calculationand tests of quantum electrodynamical effects. While spectroscopic measurementson the stable species have progressively improved over the years, highresolution studies on the radioactive isotopologues $\rm{T_2}$, $\rm{HT}$ and$\rm{DT}$ have been limited. Here we present an accurate determination of$\rm{T_2}$ $Q(J = 0 - 5)$ transition energies in the fundamental vibrationalband of the ground electronic state, by means of high resolution CoherentAnti-Stokes Raman Spectroscopy. With the present experimental uncertainty of$0.02\,\rm{cm^{-1}}$, which is a fivefold improvement over previousmeasurements, agreement with the latest theoretical calculations isdemonstrated.

CARS spectroscopy of the ($v=0\to1$) band in $\rm{T_2}$