Electron-impact ionization of atomic ions in the B isonuclear sequence

Electron-impact ionization cross sections for several atomic ions in the B isonuclear sequence are calculated using both perturbative and non-perturbative theoretical methods. A distorted wave calculation in a mixed $V^N$/$V^{N-1}$ potential for neutral B exhibits a large shape resonance in the 2s and 2p subshell ionization cross-sections near their thresholds, which is not found in an all $V^{N-1}$ potential distorted-wave calculation. The time-dependent close-coupling and $R$-matrix with pseudo-states methods provide a check for the different distorted wave methods. We also plan to present ionization cross section results for B$^{+}$, B$^{2+}$, and B$^{3+}$.