Abstract

Photons carrying a well-defined orbital angular momentum have been proven to modify spectroscopic selection rules in atomic matter. Excitation profiles of electric quadrupole transitions have been measured with single trapped ${{}^{40}\mathrm{Ca}}^{+}$ ions for varying polarizations. We further develop the photo-absorption formalism to study the case of arbitrary alignment of the beam’s optical axis with respect to the ion’s quantization axis and mixed multipolarity. Thus, predictions for $M1$-dominated ${{}^{40}\mathrm{Ar}}^{13+}$, E3-driven ${{}^{171}\mathrm{Yb}}^{+}$ and ${{}^{172}\mathrm{Yb}}^{+}$, and B-like ${{}^{20}\mathrm{Ne}}^{5+}$ are presented. The latter case displays novel effects, coming from the presence of a strong photon–magnetic dipole coupling.

© 2019 Optical Society of America

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