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Transient XUV core level spectroscopy is used to resolve photoexcited electron and hole distributions, as well as carrier-phonon and phonon-phonon scattering times, in the γ, L, and X valleys of silicon.
Attosecond transient reflectivity is developed to observe the photoexcitation dynamics in germanium. Attosecond time-resolved measurements of the dielectric function reveal a few-femtosecond collective electronic response time, which renormalizes the Coulomb interaction between the excited carriers.
We demonstrate the simple implementation a polarization-assisted amplitude gate that is capable of generating high-contrast, isolated attosecond pulses tunable between the energy range of 50–130 eV.
Extreme ultraviolet (XUV) transient absorption at the germanium M4,5-edge simultaneously measures electron and hole dynamics over 1.5 ps with few-femtosecond resolution. In the analysis, time-dependent density functional theory (TD-DFT) will be compared with experimental data.
Attosecond transient absorption spectroscopy of highly excited states allows investigating the dynamics of both the decay and the light induced coupling between excited states. We present a rigorous quantum mechanical treatment that provides a generalized discussion of the on- and off-resonant decay dynamics, of resonant and non-resonant couplings to either discrete or continua states and the temporal...
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...
We report plasmon-assisted photoemission from gold nanopillars using few cycle near-IR laser pulses, along with simulations, showing strong acceleration and a scaling of the electron yield that indicates the transition into the strong-field regime.
A novel Mach-Zehnder type interferometer coupled with the double optical gating technique provides tunable XUV or VUV isolated attosecond pulses and streak field detection with fields centered at both 750 nm and 400 nm wavelength.
Ionization gating confines high-harmonic generation to the leading edge of the driver pulse. Experimentally produced soft-x-ray continuous radiation is spectrally broad and tunable. The method suggests isolated attosecond-pulse production with long driver pulses.
High order harmonics are used for atomic molecular dynamics studies by core-level transient absorption spectroscopy and photoelectron spectroscopy. High field ionization of Xe atoms, strong field coupling effects, and dissociative ionization are investigated.
Octave-spanning laser pulses enable a new coherent control scheme based on the carrier-envelope phase (CEP). Multiphoton ionization of Xe atoms demonstrates CEP control over the phases of photoelectron quantum states and therefore the photoelectron direction.
Ionization gating confines high-harmonic generation to the leading edge of the driver pulse. Experimentally produced soft-x-ray continuous radiation is spectrally broad and tunable. The method suggests isolated attosecond-pulse production with long driver pulses.
High order harmonics are used for atomic molecular dynamics studies by core-level transient absorption spectroscopy and photoelectron spectroscopy. High field ionization of Xe atoms, strong field coupling effects, and dissociative ionization are investigated.
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