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Vacuum-ultraviolet continuum emission from HeH.

Vacuum-ultraviolet continuous emission spectra have been acquired from dense, cold helium gas in the pressure of solid hydrogen during excitation by a 6.5-MeV proton beam. The emission has been identified as the {ital D}{sup 2}{Sigma}{sup +}{r arrow}X {sup 2}{Sigma}{sup +} radiative dissociation of HeH, based on theoretical potential curves and the qualitative similarities of the continuum to discrete bands previously observed with this experimental technique.