Figure 2 (IMAGE)

Kavli Institute for the Physics and Mathematics of the Universe

Figure 2

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Direct observation of muonic molecules in resonance states
Clear separation and observation of x-ray spectral structures arising from the resonance states of muonic molecules from those originating from muonic atoms (dµ), previously unsolved with conventional detectors, achieved using high-resolution x-ray spectroscopy with the TES detector. The obtained spectrum is in excellent agreement with the theoretical calculation, indicating that the resonance states of the muonic deuterium molecule (ddµ*) were successfully identified at the level of vibrational quantum states. This result forms the foundation for quantitatively analyzing and verifying molecular formation processes in µCF for each quantum state. 

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Modified from Y. Toyama et al., Science Advances (2026)

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