The experimental study of Ba 6pjnk |M|Â =Â 0, 1 autoionizing series

The spectra of the Ba 6pnk autoionizing Stark states with |M| = 0, 1, converging to the 6p1/2+ and 6p3/2+ ionization thresholds, are measured as a function of the electric field strength F. Several 6pjnk Stark manifolds with n = 13-15 have been systematically studied in order to explore their characteristics of configuration interaction. Experimental results are analyzed by fitting them to the Lorentzian profile, from which the positions and widths are determined. Different spectroscopic properties between the Ba 6p1/2nk and 6p3/2nk autoionizing Stark states are investigated. Comparison between the Ba 6pjnk autoionizing Stark states with |M| = 0 and those with |M| = 1 are made.