Fig. 2
From: Inner-shell clock transition in atomic thulium with a small blackbody radiation shift
Magic wavelength determination. Calculated (Model 1, red solid curve), measured (blue dots), and fitted (Model 2, green dashed line) differential dynamic polarizability Δα between the upper (J = 5/2) and the lower (J = 7/2) clock levels; theoretical models are further described in the main text, including the Methods section. Inset: magnified view of the spectral region around the magic wavelength λm = 813.320(6) nm. Error bars represent 1 s.d. (standard deviation) of the measured polarizability values
