Abstract
We have carried out several R-matrixwith pseudo-states (RMPS) calculations for the electron-impact excitation of B+.Maxwell-averaged effective collision strengths have been determined for excitationsbetween the lowest 20 terms, including all those arising from the 2s3l and2s4lconfigurations. A comparison of results from 114 term and 134 termclose-coupling (CC) RMPS calculations demonstrates the convergencein the pseudo-state expansion representing the continuum and highbound-states. Comparison of the 114CC RMPS results with those from a 20CCR-matrixcalculation, using the same 114 term configuration interactiontarget, shows a reduction in the effective collision strengths byup to a factor of two at higher temperatures for transitions ton = 4.The modelling of spectral emission from boron, and fromn = 4 terms inB+in particular, is important for studying impurity influx in both current(TEXTOR) and future (ITER) magnetic fusion reactors.
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