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Emission spectra of three isotopomers of helium hydride (4HeH, 3HeH, and 3HeD) in the visible spectral region have been acquired using proton-beam irradiation of dense helium gas ( 150 Torr) at 4.2 K in the presence of some solid hydrogen or deuterium. Besides the previously reported D 2l:+ -A 2l:+ transition, near 550 nm, a second transition near 640 nm, identified as the D 2l: + _ B 2n, has been acquired and analyzed. The spectroscopic constants for both transitions have been obtained anddoi:10.1063/1.455337 fatcat:6bvalmqdu5golky6ubfnuxjuse