Origin of the 532.208 nm dysprosium polarizability discrepancy

Ascertain the physical origin of the discrepancy between reported measurements of the ground-state scalar polarizability of 162Dy at the wavelength 532.208 nm and theoretical predictions, given that measurements in the 529.37–530.21 nm interval show no spectral features that would account for this discrepancy.

Background

This work measures the background scalar-plus-tensor and vector components of the dynamical polarizability of 162Dy near the 530.306 nm intercombination line using polarization-dependent light-shift cancellations. The extracted values agree with atomic-structure calculations within uncertainties.

Prior measurements at 532.208 nm reported a ground-state scalar polarizability about a factor of two below theoretical expectations. The present study, probing 529.37–530.21 nm, sees no features that would reconcile this discrepancy, leaving its cause unresolved.