Configuration interaction effect on diamagnetic phenomena in atoms: strong mixing and Landau regions

Abstract
We present a systematic densitometer mapping of diamagnetic effects on the principal series of Ba and Sr in absorption, with magnetic fields up to 4.7 T. The $n$- and $l$-mixing spectra are resolved in both $\sigma $- and $\pi $-polarization while the quasi-Landau resonances are observed near and above the ionization limit only in $\sigma $-polarization. Configuration interaction produces striking differences in the intensities and spacings of the $n$- and $l$-mixed spectra while only the shapes of the quasi-Landau resonances depend on the atomic systems.

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