In thorium-doped LiCAF and LiSAF crystals, laser-assisted electronic bridge processes can excite and quench the 229Th nuclear clock transition far faster than direct laser excitation or radiative decay.
Photo-Induced Quenching of the 229Th Isomer in a Solid-State Host
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abstract
The population dynamics of the 229Th isomeric state is studied in a solid-state host under laser illumination. A photoquenching process is observed, where off-resonant vacuum-ultraviolet (VUV) radiation leads to relaxation of the isomeric state. The cross-section for this photoquenching process is measured and a model for the decay process, where photoexcitation of electronic states within the material bandgap opens an internal conversion decay channel, is presented and appears to reproduce the measured cross-section.
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Electronic Bridge processes in $^{229}$Th-doped LiCAF and LiSAF
In thorium-doped LiCAF and LiSAF crystals, laser-assisted electronic bridge processes can excite and quench the 229Th nuclear clock transition far faster than direct laser excitation or radiative decay.