Spectrum of BaH at 3800 Å

A new band of BaH has been observed in absorption at 3800 A by using a 21 ft concave-grating spectrograph. The band has been analysed to be the (0, 0)-band of a new system namedN2Σ-X2Σ. Strong perturbations have been observed in the upper stateN2Σ. The following band constants have been determined. νorig=26299.5cm−1,B′=3.59cm−1,D′=3.41·10−5cm−1.