On thep-complex spectra of the BaH molecule

We report new high resolution measurements on the photoabsorption spectra of BaH in the wavelength region 3,000 A–3,800 A using the second order of a 3.4 metre Ebert spectrograph and a High pressure xenon arc as the background source of continuum. Observations include two new electronic transitions of BaH and BaD, denoted asK2 ∑-X2 ∑ at 3,725 A andL2 Π —X2 ∑ at 3,694 A, which are forming an p-complex orginating from the 7p atomic state of barium. A rotational analysis of the band systems have been carried out and effective rotational constants are determined.