Abstract
Energy level separations in high-lying Rydberg states of neutral aluminium havebeen measured by a two-photon millimetre-wave resonance method to obtainn 2F–(n + 1) 2F intervals forn = 29–37 withan accuracy ±1MHz. An Al atomic beam was excited stepwise by pulsed lasers, and theRydberg atoms were detected by state-selective field ionization. Fromthese data and previous optical data for the 3s2nℓconfiguration of Al I new Ritz-expansion coefficients, which express the weaklyn-dependent quantum defectsfor the nFRydberg series, have been obtained. A previous laser-spectroscopic study of 2FRydberg levels in Al I is shown to be in error, and quantum defects based on theclassical spectroscopic work of Eriksson and Isberg are confirmed. The nFseries is completely regular and shows no sign of perturbations by other electronicconfigurations.
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