Fig. 3.

Time evolution of the nuclear wave packet in the in the covalent $A^1\mathrm{\Sigma }$ state following excitation with a 10-fs pump-pulse (FWHM). (A) Probability density. (B) Excited-state population ($A^1\mathrm{\Sigma }$, black) and the magnitude of the coherence $\left|{\tilde{\rho }}_{eg}\right|$ (blue). The initial coherence created by the pump pulse ($T<50$ fs) is not shown.