Measurement of the electric quadrupole amplitude in atomic thallium transition using electromagnetically induced transparency

Abstract

We report on a measurement of the transition amplitude ratio χ of an electric quadrupole () to a magnetic dipole () of the transition in atomic thallium. We utilized the electromagnetically induced transparency mechanism and the sideband-bridging technique to resolve the isotopic transitions and their hyperfine manifold. Our measurement gave for 205Tl, and for 203Tl, which was measured for the first time. Our results provide a reference point for the theoretical calculation of atomic structures, and new input for the long dispute on the atomic thallium parity non-conservation measurements.