摘要: SOME time ago1 we reported a band system 1Σ1Σ in bismuth hydride, having its origin the vicinity of Bi line λ4722. With aid improved light sources, have been able to trace this more completely, bands (0, 0), 1), (1, 2) being analysed at high dispersion. In addition, two new systems are now reported. red part spectrum 1Σ1II appears, common initial state with that blue system. The here states vibrations.