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Optical emission spectroscopy is used for the determination of hydrogen molecule rotational T rot and vibrational T vib and translational temperature T tr . The experiment was carried out using copper or titanium hollow cathode discharges operated in pure hydrogen. The rotational temperature of excited electron energy levels is determined from Fulcher-α diagonal bands (d 3 u → a 3 + g electronic transition, P-, Q-and R-branches), which were later used to derive the rovibronic temperature of the hydrogen molecule ground state, which is assumed equal to T tr . The vibrational temperature T vib is determined for the same electronic transition (Q-branch with ν = 2,3; ν = 0). For all temperatures the radial temperature distribution is reported.

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