High-resolution studies of BaD molecule in the ultraviolet region

Abstract

We report a new high-resolution absorption spectrum of BaD in the wavelength region (3580÷3760) A using the third order of a 21 ft. concave grating spectrograph. Two new electronic states of BaD are reported named asK2∃-X2 ∃ at 3750 A andL2II-X2 ∃ at 3680 A, respectively. The (0,0),(1,1),(1,0) and (2,1) bands of theL2-II-X2∃ state and (0,0) and (1,0) bands of theK2∃-X2∃ state have been observed. Vibrational and rotational analysis of these newly observed bands have been carried out and the corresponding effective vibrational and rotational constants are reported. TheK2∃ andL2II states are tentatively assigned as originating from the 7p atomic state of barium.