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Off-resonant x-ray diffraction provides a novel real-space and real-time probe of electronic and vibrational dynamics in optically excited molecules. The entire manifold of valence electronic excitations may be monitored through the dependence of the x-ray Raman peaks on the scattering wave vector ⌬k and energy ⌬. The electronic excitation energies and transition density matrices of a polydiacetylene oligomer, computed using the time-dependent Hartree-Fock collective electronic oscillatordoi:10.1063/1.1533014 fatcat:jjhl2lwc25h3bpjdqgjuwpwioy