l mixing in sodium n=28 caused by multiple ion impact: evolution of the final-state distribution

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Abstract
Time-resolved field ionisation was used to analyse the distribution of final l states produced by l-mixing collisions of 1000 eV Ar+ ions on Na(28d) Rydberg atoms. The results for several incident beam intensities were analysed by a curve-fitting procedure and coefficients that represent the population per sublevel (l,m) were extracted. For comparison, calculated sudden dipole l to l+or-1 cross sections were used in a rate-equation model to determine sublevel populations under the same conditions. The good qualitative agreement of experimental and theoretical results implies that the calculated l-change cross sections for n=28 are correct within about a factor two. The results show that broad distributions that encompass high-l states are obtained in ion-Rydberg encounters near the matching velocity only under multiple collision conditions and that under conditions of weak bombardment the collisional interactions are dominated by dipole-allowed processes.

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