Recent pump-probe experiments with high harmonic generation in
polyatomic molecules have shown that vibrational frequencies appear in
the spectra of high harmonics measured as a function of time delay. I
will discuss an interpretation of this phenomenon as a multiple pathway
quantum interference effect, and address the physics controlling the
amplitudes associated with the various pathways. I also plan to address
theoretical challenges that will need to be overcome in order to utilize
high harmonic spectra as a tool for imaging molecular orbitals.
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