Dielectronic recombination cross section for B III

The dielectronic recombination cross section has been estimated for the ${\mathrm{B}}^{2+}$ target and projectile electron energies in the range 0.1 ∼0.5 Ry, corresponding to the $2s\to 2p$ ($\Delta n=0\mathrm{}$) excitation accompanied by capture of the continuum electron into a high Rydberg state ($\mathrm{nl}$). Contributions from $n\lesssim 400$ and $l\lesssim 15$ are estimated with the use of an improved theoretical procedure. For a typical electron energy resolution of 2.0 eV, the cross section with $n\lesssim 20$ is 1.6×${10}^{-19\mathrm{}}$ ${\mathrm{cm}}^2$.