The electron-impact-broadened profile of the resonance doublet of singly ionized beryllium (2s-2p, λ=3130.4 and 3131.1 {}) has been measured using an electromagnetically driven shock tube and a rapid-scanning Fabry-Perot spectrometer. For the conditions Nₑ=10¹⁷ cm^-3 and T = 19 000^∘{}K, we found the Lorentz half-width of each line in the doublet to be 0.035 {} ±{} 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 {}, respectively. Possible reasons for the discrepancy are discussed.
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Sánchez et al. (1973) studied this question.
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