Calculation of resonance widths of 3P states in He-like systems

We report calculations of (non-relativistic) energies and widths of the first ten 3P resonances of the He isoelectronic series under the n = 2 threshold, using a discretisation method which has been shown in previous work to be both simple and accurate. Our results are compared, whenever possible, with other accurate published data. Weights and contributions to the resonance width of configurations making up the closed-channel wavefunctions are tabulated and discussed. (author)