# Transition frequencies and hyperfine structure in In+113,115 : Application of a liquid-metal ion source for collinear laser spectroscopy

@article{Knig2020TransitionFA,
title={Transition frequencies and hyperfine structure in
In+113,115
: Application of a liquid-metal ion source for collinear laser spectroscopy},
author={Kristian K{\"o}nig and J{\"o}rg Kr{\"a}mer and Phillip Imgram and Bernhard Maa{\ss} and Wilfried N{\"o}rtersh{\"a}user and Tim Ratajczyk},
journal={Physical Review A},
year={2020},
volume={102}
}
• Published 7 July 2020
• Physics
• Physical Review A
We demonstrate the first application of a liquid-metal ion source for collinear laser spectroscopy in proof-of-principle measurements on naturally abundant In$^+$. The superior beam quality, i.e., the actively stabilized current and energy of a beam with very low transverse emittance, allowed us to perform precision spectroscopy on the $5s^2\;^1\mathrm{S}_0 \rightarrow 5s5p\;^3\mathrm{P}_1$ intercombination transition in $^{115}$In$^+$, which is to our knowledge the slowest transition measured…

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