Fig. 3
From: Inner-shell clock transition in atomic thulium with a small blackbody radiation shift
Spectroscopy of the clock transition. a Spectral line shape of the clock transition in Tm. Every point is an average of six measurements. The solid curve shows the fit calculated for a Fourier-limited 80 ms rectangular π-pulse. δν is the detuning from an exact resonance. b Clock transition frequency shift Δν depending on By (dots) at Bz = 0 and constant Bx = 225 mG; the solid line is a parabolic fit. The dependence on Bz is similar. Error bars represent 1 s.d. of the By magnetic field (horizontal) and of the measured frequency shift (vertical)
