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Extreme ultraviolet pulses produced by high order harmonic generation are used to probe ultrafast atomic and molecular dynamics. States of high field ionization, coherent superpositions, and alignment are obtained by core level transient absorption spectroscopy.
A novel femtosecond extreme ultraviolet (EUV) ion-imaging technique is applied to study ultrafast dynamics in electronically excited helium nanodroplets. Ion mass spectra recorded by single-photon EUV ionization and by transient EUV-pump/IR-probe two-photon ionization differ significantly for EUV photon energies below and above ∼24 eV, in agreement with recently performed synchrotron measurements...
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