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We present the first evidence of excitation of the $5p_{3/2} \rightarrow6p_{1/2}$ electric dipole-forbidden transition in atomic rubidium. Theexperiments were carried out in a rubidium vapor cell using Doppler-freeoptical-optical double-resonance spectroscopy with counter-propagating beams.This a similar scheme to the excitation of the other fine transition $J=3/2$ inthe $6p_{J}$ manifold previously reported. A $5s_{1/2} \rightarrow 5p_{3/2}$electric dipole preparation step using a diode laser locked to the maximum Fcyclic transition of the $D_2$ line is used to prepare the atoms in the firstexcited state. This is followed by the $5p_{3/2} \rightarrow 6p_{1/2}$dipole-forbidden excitation, in a two-photon ladder ($\Xi$) excitation scheme.Production of atoms in the $6p_{1/2}$ excited state is verified by detection ofthe $421$ nm fluorescence that results from direct decay into the $5s_{1/2}$ground state. The polarization dependence of the relative intensities of thelines of the decay fluorescence is also investigated. Experimental data fordifferent polarization configurations of the light beams are compared with theresults of calculations that consider a strong atom-field coupling in thepreparation step, followed by a weak electric quadrupole excitation and theblue fluorescence decay emission. Good agreement between experiment and thisthree-step model is found in the case of linear-linear polarizations in bothisotopes.

journal of physics. b, atomic molecular and optical physics/journal of physics. b, atomic, molecular and optical physics

Completing the optical spectroscopy of the $6p_{J}$ manifold: the  $5p_{3/2}\rightarrow 6p_{1/2}$ electric dipole forbidden transition in atomic  rubidium