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By combining results from a Doppler-free two-photon laser excitation study on several lines in the EF1 [image omitted] - X1 [image omitted] (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 [image omitted], v = 0, N = 0 ground level, were determined for 547 rovibronically excited states in H2. While for some of the levels in the EF1 [image omitted] and B1 [image omitted] 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 [image omitted] and [image omitted] level energies and those in the X1 [image omitted] ground state. [ABSTRACT FROM AUTHOR]

The emission spectrum of neutral diatomic hydrogen has been recorded at Doppler width limited resolution by Fourier transform spectroscopy in the spectral range 1800-22,500 cm-1. Rotational analysis of the triplet systems involving the electronic states c3Πu, [image omitted], [image omitted], and the 3s,d complex has been carried out in order to determine precise rovibronic energies (with v = 0 to 3) of the 3s,d complex. This new observation agrees with the earlier calculations within a few cm-1 and corrects incorrect 'observed' level energies published for v = 2 and 3, [image omitted] by about 50 and 90 cm-1, respectively. [ABSTRACT FROM AUTHOR]