Measurement and Calculation of the Stark-Broadening Parameters for the Resonance Lines of Singly Ionized Beryllium

Abstract

The electron-impact-broadened profile of the resonance doublet of singly ionized beryllium ($2s\ensuremath{-}2p$, $\ensuremath{\lambda}=3130.4 \mathrm{and} 3131.1$ \AA{}) has been measured using an electromagnetically driven shock tube and a rapid-scanning Fabry-Perot spectrometer. For the conditions ${N}_{e}={10}^{17}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ and $T$ = 19 000\ifmmode^\circ\else\textdegree\fi{}K, we found the Lorentz half-width of each line in the doublet to be 0.035 \AA{} \ifmmode\pm\else\textpm\fi{} 15%. For comparison with theory, we did both a quantum-mechanical (using the close-coupling method) and a semiclassical calculation, obtaining the values 0.015 and 0.042 \AA{}, respectively. Possible reasons for the discrepancy are discussed.