Fig. 2: Ethylene–ethylidene photoisomerization yield.
From: Ultrafast probing of isotope-induced explicit symmetry breaking in ethylene

Theoretical ethylidene population as a function of time for the parent ions a \({{{\rm{C}}}}_{2}{{{\rm{H}}}}_{4}^{+}\), b 13\({{{\rm{C}}}}_{2}{{{\rm{H}}}}_{4}^{+}\), and c 13\({{{\rm{C}}}}^{12}{{{\rm{CH}}}}_{4}^{+}\), upon excitation to D3 electronic state. The dashed-dotted lines correspond to the fitting with a logistic function (see main text for details).