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Nonadiabatic dynamics around an avoid crossing or a conical intersection playa crucial role in the photoinduced processes of most polyatomic molecules. Thepresent work shows that the topological phase in conical intersection makes thebehavior of pump-probe high-order harmonic spectroscopy different from the caseof avoid crossing. The coherence built up when the system crosses the avoidcrossing will lead to the oscillatory behavior of the spectrum, while thegeometric phase erodes these oscillations in the case of conical intersection.Additionally, the dynamical blueshift and the splitting of time-resolvedspectrum allow capturing the snapshot dynamics with sub-femtosecond resolution.

Catching the geometric phase effect around conical intersection in molecules by high order harmonic spectroscopy