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Related Experiment Video

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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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Few-Electron Highly Charged Muonic Ar Atoms Verified by Electronic K X Rays.

T Okumura¹, T Azuma^2,3, D A Bennett⁴

¹Tokyo Metropolitan University, Department of Chemistry, Hachioji, Tokyo 192-0397, Japan.

Physical Review Letters

|July 31, 2025

Summary

Researchers observed highly charged muonic argon (μAr) for the first time using K x-ray spectroscopy. This breakthrough provides insights into the atomic structure and deexcitation dynamics of these unique few-body systems.

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Last Updated: Sep 13, 2025

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

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Area of Science:

Atomic Physics
Few-Body Systems
Muonic Atoms

Background:

Highly charged muonic ions are complex atomic systems with a nucleus, a muon, and electrons.
Previous studies lacked state-selective observation of these systems, limiting detailed analysis.
Understanding their structure is crucial for advancing atomic physics theories.

Purpose of the Study:

To achieve the first state-selective observation of highly charged muonic argon (μAr).
To investigate the electronic K x-ray spectra of muonic argon.
To analyze the deexcitation dynamics of highly charged muonic argon.

Main Methods:

Utilized electronic K x-ray spectroscopy for high-precision measurements.
Employed an array of transition-edge sensor microcalorimeters for sensitive detection.
Combined experimental data with theoretical calculations for spectral analysis.

Main Results:

Successfully observed highly charged muonic argon (μAr) in H-like, He-like, and Li-like states.
High-precision K x-ray spectra clearly indicated the presence of these muonic atom configurations.
Observed peak positions matched theoretical predictions for highly charged chlorine ions.

Conclusions:

The study provides the first state-selective evidence of highly charged muonic argon.
Experimental results align with theoretical calculations, validating the models used.
The findings offer new insights into the deexcitation processes in these exotic atomic systems.