HIGH-RESOLUTION EMISSION-SPECTRA OF H-2 AND D2 NEAR 80 NM

A few lines were observed in the far ultraviolet emission spectrum of molecular hydrogen and deuterium. They are assigned to transitions from levels of the 3p pi D **1 PI //u** minus state, lying above the dissociation limit into H(1s) plus H(n equals 2), near 84. 5 nm, and, for some of them, above the first ionization limit near 80. 4 nm, the lower state being X **1 SIGMA //g** plus ( upsilon double prime equals 1). This is in fair agreement with measured predissociation and preionization yields. Accurate line position measurements lead to molecular constants in very good agreement with theoretical calculations.