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We propose a novel means to isolate and quantify the effects of Berry forceon molecular dynamics using two reasonably strong continuous wave (CW) laserfields with frequencies $\omega$ and $2\omega$. For molecules or materials withthree frequency-matching bright transitions($|{0}\rangle\rightarrow|{1}\rangle$, $|{1}\rangle\rightarrow|{2}\rangle$,$|{0}\rangle\rightarrow|{2}\rangle$) at frequencies ($\omega$, $\omega$,$2\omega$) respectively, the effects of Berry curvature can be isolated byvarying the phase between the two laser fields ($\Delta \phi$) and monitoringthe dynamics. Moreover, we find that the resulting chemical dynamics can dependcritically on the sign of $\Delta \phi$; in other words, the effects of Berrycurvature can be enormous. Thus, this manuscript represents an unusual stepforward towards using light-matter interactions to affect chemical dynamics,suggesting that topological concepts usually invoked in adiabatic quantumoptics and condensed matter can be directly applied to non-adiabatic chemicalexcited state dynamics.

A Protocol for Spectroscopists to Isolate The Effect of Berry Geometric Magnetic Forces on Molecular Dynamics