Abstract

The limitations of methods of excitation and analysis of double-Rydberg states of neutral barium atoms are discussed. Excitation spectra of the type 6snd → 9dn′d are studied and interpreted in a two-channel quantum-defect model for n ≥ 15. No resonance is observed for n < 15, which fixes the limit of the possibilities of the sequential laser excitation. Similar behavior is observed for excitation spectra 6snp → 26dn′p and 6snp → 27sn′p for n < 39.

© 1988 Optical Society of America

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