Excitation of E1-forbidden atomic transitions with electric, magnetic, or mixed multipolarity in light fields carrying orbital and spin angular momentum [Invited]

AFANASEV, ANDREI; SCHMIDT-KALER, FERDINAND; SOLYANIK-GORGONE, MARIA; SCHMIEGELOW, CHRISTIAN T.; CARLSON, CARL E.

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS

OPTICAL SOC AMER

Año: 2019 vol. 36

0740-3224

Photons carrying a well-defined orbital angular momentum have beenproven to modify spectroscopic selection rules in atomic matter.Excitation profiles of electric quadrupole transitions have beenmeasured with single trapped Ca40+ ions for varying polarizations. Wefurther develop the photo-absorption formalism to study the case ofarbitrary alignment of the beam?s optical axis with respect tothe ion?s quantization axis and mixed multipolarity. Thus,predictions for 𝑀1-dominated Ar4013+, E3-driven Yb171+ and Yb172+, and B-like Ne205+ are presented. The latter case displaysnovel effects, coming from the presence of a strongphoton?magnetic dipole coupling.