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London-van der Waals dispersion forces are a fundamental component ofcondensed matter systems, biological processes, and self-assembly. In thisletter we propose a method to calculate the C6 coefficients that characterizedispersion forces in the non-retarded regime for molecules in a coherentsuperposition of excited states. Several ultrafast femtosecond pump-probeschemes are investigated. We apply the method to LiH molecules and show thattheir London-van der Waals interaction can change dramatically after theinteraction with the pump pulse. The pulse modulates the C6 coefficients, andthe interplay between polarization, orientation of the molecules, and thedipole fields gives rise to a rich variety of combinations.

Long-range dispersion forces between molecules subject to ultra-short optical pulses from ab initio calculations