Fig. 1: Experimental results.
From: Ultrafast probing of isotope-induced explicit symmetry breaking in ethylene

Typical two-color signal as a function of the XUV pump -- NIR probe delay for a 12\({{{\rm{CH}}}}_{3}^{+}\) from 12C2H4, b 13\({{{\rm{CH}}}}_{3}^{+}\) from 13C2H4 and c 13\({{{\rm{CH}}}}_{3}^{+}\) from 13C12CH4. The error-bars correspond to statistical fluctuations. In each panel, the solid line denotes fitting with an exponentially decaying function (see Methods for details). d The corresponding time constants, τ, at different NIR-probe intensities for three different isotopologues: C2H4 (solid red circles), 13C2H4 (solid green diamonds) and 13C12CH4 (solid blue squares). The uncertainties stem only from the fitting. In each case, the dashed line corresponds to the weighted average and the shaded area represents the 95% confidence interval.