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 ($2s-2p$, $\lambda =3130.4\mathrm{} \mathrm{and} 3131.1$ Å) has been measured using an electromagnetically driven shock tube and a rapid-scanning Fabry-Perot spectrometer. For the conditions $N_e={10}^{17}$ ${\mathrm{cm}}^{-3\mathrm{}}$ and $T$ = 19 000°K, we found the Lorentz half-width of each line in the doublet to be 0.035 Å ± 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 Å, respectively. Possible reasons for the discrepancy are discussed.