Low-energy outer-shell photodetachment of the negative ion of boron.

The photodetachment of the negative ion of boron, B$\rm ^-(2s^22p^2)^3P$, was investigated by employing the $B$-spline \hbox{$R$-matrix} method [1] for photon energies ranging from threshold to 12~eV [2]. A multi-configuration Hartree-Fock method with non\-orthogonal, term-dependent orbitals was used to generate accurate initial bound-state and final continuum-state wave\-functions. The close-coupling expansion included all principal scattering channels for photo\-detachment from both the 2p and 2s orbitals. The resulting equation were solved using a parallelized version of the BSR computer code [3]. The calculated photo\-detachment cross sections are in good agreement with the available experimental data. Several prominent resonance features are predicted, thereby providing new challenges in the study of this highly correlated process. To classify the resonance structure, both the partial cross sections and the main contributions of the individual scattering channels are discussed. \par\noindent [1] O. Zatsarinny and K. Bartschat, J. Phys. B 46 (2013) 112001. \par\noindent [2] K. Wang, O. Zatsarinny, and K. Bartschat, EPJD (2016), in press. \par\noindent [3] O. Zatsarinny, Comp. Phys. Commun. 174 (2006) 272.