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Recent results of laser spectroscopy experiments of pionic helium atoms at PSI

M. Hori, H. Aghai-Khozani, A. S\'ot\'er, A. Dax, D. Barna

SciPost Phys. Proc. 5, 026 (2021) · published 6 September 2021

Proceedings event

Review of Particle Physics at PSI


A review of a recent experiment carried out at PSI involving laser spectroscopy of metastable pionic helium ($\pi{\rm ^4He}^+\equiv\pi^{-}+{\rm ^4He}^{2+}+e^-$) atoms is presented. An infrared transition $(n,\ell)=(17,16)$$\rightarrow$$(17,15)$ at a resonance frequency of $\nu\approx 183760$ GHz was detected.

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