Extended Data Fig. 4: Resonance profiles of the (n, ℓ) = (39, 35) → (38, 34) transition of wavelength λ = 597 nm as a function of the optical frequency of the laser observed in gas and supercritical phase helium, He I and He II targets. | Nature

Extended Data Fig. 4: Resonance profiles of the (n, ℓ) = (39, 35) → (38, 34) transition of wavelength λ = 597 nm as a function of the optical frequency of the laser observed in gas and supercritical phase helium, He I and He II targets.

From: High-resolution laser resonances of antiprotonic helium in superfluid 4He

Extended Data Fig. 4

The temperature and atomic density of the helium target used in each measurement are indicated (see text). Error bars, 1 s.d.

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