Laser-produced high-order harmonics in the soft x-ray are used to probe dissociating molecules, ring opening, and solid-state charge carrier dynamics. Core level spectroscopic transitions of specific atoms are probed to reveal charge state dynamics. Both femtosecond and attosecond timescale dynamics are obtained by transient absorption in the extreme ultraviolet and x-ray spectral regimes. Product branches are observed directly and time measurements are obtained for the production of various excited state species. Transient features, indicative of x-ray spectroscopic transitions to dissociative states or passage through conical intersections are characterized. On ultrashort timescales, electronic and vibrational wave packet dynamics are investigated, as well as charge migration in molecules. Shifts of core level spectral transitions with vibrational excitation are observed. In solids, charge transfer processes, band gap responses to carrier injection, detection of both electrons and holes, and the participation of phonon modes are quantified. A remarkable time-resolved x-ray spectroscopic revolution provides novel opportunities for molecular dynamics investigations on femtosecond and attosecond timescales.

<b>Award Address</b> (Ahmed Zewail Award in Ultrafast Science & Technology sponsored by the Ahmed Zewail Endowment Fund by the Newport Corporation (Newport)). Ultrafast x-ray dynamics

253rd National Meeting (2017)

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Award Address (Ahmed Zewail Award in Ultrafast Science & Technology sponsored by the Ahmed Zewail Endowment Fund by the Newport Corporation (Newport)). Ultrafast x-ray dynamics