Resolution of the Ba (6$p_j$${\mathrm{nd}}_j$${)}_1$ and (6$p_j$${\mathrm{nd}}_j$${)}_3$ autoionizing states and their mixing with the (6$p_j$${\mathrm{ns}}_{1/2}$${)}_1$ and (6$p_j$${\mathrm{ng}}_j$${)}_3$ states

We report the resolution of the Ba (6$p_j$ ${\mathrm{nd}}_j$ ${)}_{J=1\mathrm{}}$ and (6$p_j$ ${\mathrm{nd}}_j$ ${)}_{J=3\mathrm{}}$ autoionizing levels and their mixing with the (6$p_j$ ${\mathrm{ns}}_{1/2}$ ${)}_{J=1\mathrm{}}$ and (6$p_j$ ${\mathrm{ng}}_j$ ${)}_{J=3\mathrm{}}$ states by a three-step laser excitation approach. For the 6$p_{1/2}$ ${\mathrm{nd}}_j$ levels we are unable to discern a difference between J=1 and J=3. For the 6$p_{3/2}$nd levels we are able to identify the two J=3 states, but only one J=1 feature, and measure their quantum defects. Furthermore we are able to measure the mixing of the (6$p_{3/2}$ ${\mathrm{nd}}_j$ ${)}_{J=1\mathrm{}}$ states with the (6$p_{3/2}$ ${\mathrm{ns}}_{1/2}$ ${)}_{J=1\mathrm{}}$ states and determine that the analogous mixing of the (6$p_{3/2}$ ${\mathrm{nd}}_j$ ${)}_{J=3\mathrm{}}$ states with the (6$p_{3/2}$ ${\mathrm{ng}}_j$ ${)}_{J=3\mathrm{}}$ states is not observable, nor is any mixing of the 6$p_{1/2}$ ${\mathrm{nd}}_j$ states with either 6$p_{1/2}$ ${\mathrm{ns}}_{1/2}$ or 6$p_{1/2}$ ${\mathrm{ng}}_j$ states.