Extended Data Table 2 Frequency centroids and FWHM Lorentzian linewidths of the (n, ℓ) = (39, 35) → (38, 34) resonance of wavelength λ = 597 nm at various target phases and densities

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

  1. Values in parentheses for the frequency centroid ν show the 1 s.d. total, statistical, laser-related and fit uncertainties (total)(stat)(las)(fit). Values in parentheses for the Lorentzian linewidth ΓL show the 1 s.d. total, statistical, laser-related and temperature fluctuation uncertainties (total)(stat)(las)(fluc); see text. The zero-density transition frequency was previously determined as ν0 = 501,948.753(2) GHz 9.
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