95 research outputs found
Intramolecular vibronic dynamics in molecular solids: C60
Vibronic coupling in solid C60 has been investigated with a combination of resonant photoemission spectroscopy (RPES) and resonant inelastic x-ray scattering (RIXS). Excitation as a function of energy within the lowest unoccupied molecular orbital resonance yielded strong oscillations in intensity and dispersion in RPES, and a strong inelastic component in RIXS. Reconciling these two observations establishes that vibronic coupling in this core hole excitation leads to predominantly inelastic scattering and localization of the excited vibrations on the molecule on a femtosecond time scale. The coupling extends throughout the widths of the frontier valence bands.
Recommended from our members
Towards time resolved core level photoelectron spectroscopy with femtosecond x-ray free-electron lasers
We have performed core level photoelectron spectroscopy on a W(110) single crystal with femtosecond XUV pulses from the free-electron laser at Hamburg (FLASH). We demonstrate experimentally and through theoretical modelling that for a suitable range of photon fluences per pulse, time-resolved photoemission experiments on solid surfaces are possible. Using FLASH pulses in combination with a synchronized optical laser, we have performed femtosecond time-resolved core-level photoelectron spectroscopy and observed sideband formation on the W 4f lines indicating a cross correlation between femtosecond optical and XUV pulses. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
Photoelectron Angular Distributions for Two-photon Ionization of Helium by Ultrashort Extreme Ultraviolet Free Electron Laser Pulses
Phase-shift differences and amplitude ratios of the outgoing and
continuum wave packets generated by two-photon ionization of helium atoms are
determined from the photoelectron angular distributions obtained using velocity
map imaging. Helium atoms are ionized with ultrashort extreme-ultraviolet
free-electron laser pulses with a photon energy of 20.3, 21.3, 23.0, and 24.3
eV, produced by the SPring-8 Compact SASE Source test accelerator. The measured
values of the phase-shift differences are distinct from scattering phase-shift
differences when the photon energy is tuned to an excited level or Rydberg
manifold. The difference stems from the competition between resonant and
non-resonant paths in two-photon ionization by ultrashort pulses. Since the
competition can be controlled in principle by the pulse shape, the present
results illustrate a new way to tailor the continuum wave packet.Comment: 5 pages, 1 table, 3 figure
Contrasting behavior of covalent and molecular carbon allotropes exposed to extreme ultraviolet and soft x-ray free-electron laser radiation
All carbon materials, e.g., amorphous carbon (a-C) coatings and C60 fullerene
thin films, play an important role in short-wavelength free-electron laser
(FEL) research motivated by FEL optics development and prospective
nanotechnology applications. Responses of a-C and C60 layers to the extreme
ultraviolet (SPring-8 Compact SASE Source in Japan) and soft x-ray
(free-electron laser in Hamburg) free-electron laser radiation are investigated
by Raman spectroscopy, differential interference contrast, and atomic force
microscopy. A remarkable difference in the behavior of covalent (a-C) and
molecular (C60) carbonaceous solids is demonstrated under these irradiation
conditions. Low thresholds for ablation of a fullerene crystal (estimated to be
around 0.15 eV/atom for C60 vs 0.9 eV/atom for a-C in terms of the absorbed
dose) are caused by a low cohesive energy of fullerene crystals. An efficient
mechanism of the removal of intact C60 molecules from the irradiated crystal
due to Coulomb repulsion of fullerene-cage cation radicals formed by the
ionizing radiation is revealed by a detailed modeling
Разработка схемы эксперимента для проверки адекватности математической модели процесса коммутации постоянного и переменного напряжения
Материалы X Междунар. межвуз. науч.-техн. конф. студентов, магистрантов и аспирантов, Гомель, 29–30 апр. 2010 г
- …