We have employed monochromatized synchrotron radiation to measure the ${\mathrm{Be}}^{+}$ ion yield in the photon energy region of the Be $2pn\mathcal{l}(n=3\mathrm{}–12)$ double excitations. The energy positions of the resonances are in good agreement with a previous experiment [J. M. Esteva, G. Mehlman-Balloffet, and J. Romand, J. Quant. Spectrosc. Radiat. Transf. 12, 1291 (1972)] and theoretical calculations. We also report the experimentally determined Fano parameters of the widths $\Gamma$ and profile parameters q for the $2pns$ $(n<~8)$ resonances. The q values are about $-0.54$ except for $n=3\mathrm{}$ with a clearly lower value of $-0.93\left(5\right).$

• Received 4 August 2003

DOI:https://doi.org/10.1103/PhysRevA.68.052708