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Combination of small angle scattering and three-dimensional stochastic reconstruction for the study of adsorption–desorption processes in Vycor porous glass
We study sorption and transport processes in dry and wet (preadsorbed with CH2Br2) Vycor glass by combining small angle scattering and three-dimensional (3D) stochastic reconstruction methods. Three-p...
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Desorption of CO from Ru(001) induced by near-infrared femtosecond laser pulses

J. Chem. Phys. 112, 9888 (2000); doi:10.1063/1.481626

Issue Date: 8 June 2000

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S. Funk, M. Bonn, D. N. Denzler, Ch. Hess, M. Wolf, and G. Ertl
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
Irradiation of a Ru(001) surface covered with CO using intense femtosecond laser pulses (800 nm, 130 fs) leads to desorption of CO with a nonlinear dependence of the yield on the absorbed fluence (100–380 J/m2). Two-pulse correlation measurements reveal a response time of 20 ps (FWHM). The lack of an isotope effect together with the strong rise of the phonon temperature (2500 K) and the specific electronic structure of the adsorbate–substrate system strongly indicate that coupling to phonons is dominant. The experimental findings can be well reproduced within a friction-coupled heat bath model. Yet, pronounced dynamical cooling in desorption, found in the fluence-dependence of the translational energy, and in a non-Arrhenius behavior of the desorption probability reflect pronounced deviations from thermal equilibrium during desorption taking place on such a short time scale. ©2000 American Institute of Physics.
History: Received 6 August 1999; accepted 13 March 2000
Permalink: http://link.aip.org/link/?JCPSA6/112/9888/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.45.Da
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solid–fluid interfaces Adsorption and desorption kinetics; evaporation and condensation
  • 79.20.La
    Electron and ion emission by liquids and solids; impact phenomena Impact phenomena (including electron spectra and sputtering) Photon- and electron-stimulated desorption
  • 61.80.Ba
    Structure of solids and liquids; crystallography Physical radiation effects, radiation damage Ultraviolet, visible, and infrared radiation effects (including laser radiation)
  • 79.20.Ds
    Electron and ion emission by liquids and solids; impact phenomena Impact phenomena (including electron spectra and sputtering) Laser-beam impact phenomena
  • YEAR: 2000

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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