Accurate level energies in the EF1S+g, GK1S+g, H1S+g, B1S+u, C1Pu, B'1S+u, D1Pu, I1Pg, J1Dg states of H2

By combining results from a Doppler-free two-photon laser excitation study on several lines in the EF1 − X1 (0,0) band of H2 with results from a Fourier-transform spectroscopic study on a low-pressure discharge in hydrogen, absolute level energies, with respect to the X1 , v = 0, N = 0 ground level, were determined for 547 rovibronically excited states in H2. While for some of the levels in the EF1 and B1 states the uncertainties are as low as 0.0001 cm−1, the accuracy of other levels is lower. The general improvement in the accuracy for the comprehensive data set of level energies is by an order of magnitude with respect to previous measurements. An updated listing of transition wavelengths of the spectral lines in the Lyman and Werner bands is presented, based on combination differences between the presently obtained B1 and level energies and those in the X1 ground state.