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B 24 91 Crossref. Yet the high-energetic electrons after excitation with a shorter wavelength can couple more efficiently to certain unoccupied adsorbate resonances e. This site uses cookies. Taking into account the lower base temperature in the latter experiment, it appears that both the associative CO desorption and the desorption of molecularly bound CO species exhibit similar translational excitation if initiated with fs-laser pulses. Quantitative details will be discussed further below. Possible origins of this discrepancy, such as unequal energy partitioning between the molecular degrees of freedom or nonadiabatic damping, are discussed.

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The nascent N 2 are found to exhibit only little vibrational excitation despite the pronounced barrier along the vibrational coordinate. A 4 86 Crossref.

Briefly, a fs laser pulse is split into two beams. We therefore conclude that the thermal properties of the thin Bi film are similar to bulk Bismuth.

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These findings imply strong vibrational quenching cooling in reactive trajectories passing the barrier and consequently were taken as indirect evidence for strong nonadiabatic coupling in the N 2 desorption process.

Panels c and d show the 2PC on a logarithmic timescale for clarity. In an alternative scenario, the observed wavelength dependence might be gr-ru001 by different optical properties of the Ru substrate with respect to the two wavelengths applied. The more intense part is guided on to the sample. In contrast, in a purely phonon-mediated process, the slow temperature rise and cooling of the phonon system cause desorption fairly smeared out in time.

By continuing to use this site you agree to our use of cookies. For electrons with high kinetic energy, surface sensitivity is only achieved at grazing incidence in a reflection high energy electron diffraction geometry RHEED.

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When describing processes like the desorption of adsorbates from a substrate in the frictional approach, the energy in a 1D model flows directly into the coordinate relevant to the reaction, whereas in multidimensional dynamics the energy is not exclusively transferred into the reaction coordinate but also into coordinates not necessarily leading to the reaction of interest.

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This work is funded by the Deutsche Forschungsgemeinschaft through SFB ‘Energy dissipation at surfaces’ which is gratefully acknowledged. It is only beyond the transition state where at least the second coordinate the distance between fd-ru001 CO and Ru surfaces becomes relevant. To characterize the energy release into the reaction products, the translational energy of the desorbing CO molecules along the surface normal is measured.

The resulting diffraction patterns are recorded by a multi channel plate-detector and a cooled CCD camera. This means that approximately 0. Thus, on the much longer time scale of the film cooling the optical and acoustic phonons are in equilibrium. Consequently, higher adsorbate temperatures T ads result in either of the basic reaction mechanisms driven by substrate electrons or phonons.

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Note that especially in the fs-laser-induced CO association described further below the timescales of such reactions do not allow for any substantial diffusion events from terrace to step sites to contribute.

Sokolowski-Tinten K et al Femtosecond x-ray measurement aindows coherent lattice vibrations near the Lindemann stability limit Nature Crossref Wineows. Due to total reflection at the interface, phonons outside the critical cone are confined in the film. In a pump and probe experiment, the hetero structure is excited by a short pump laser pulse followed by a short probe electron pulse which is diffracted at the surface.

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It supports the sharing of ideas and thoughts within the scientific community, fosters physics teaching and would also like to open a window to physics for all those with a healthy curiosity. To find out more, see gd-fu001 Privacy and Cookies policy.

The Winxows Physikalische Gesellschaft DPG with a tradition extending back to is the largest physical society in the world with more than 61, members. We acknowledge fruitful discussions with M Aeschlimann and B Rethfeld.

B 72 Crossref. Possible origins of this discrepancy, such as unequal energy partitioning between the molecular degrees of freedom or nonadiabatic damping, are discussed.

Thermal boundary conductance in heterostructures studied by ultrafast electron diffraction

Due to their low group velocity, however, the critical cone for total reflection is extremely narrow. Eyring H Chem. Calculations are performed for three frictional coupling scenarios with parameter sets A, B and C and the results are plotted with solid, dashed and dotted lines, respectively. Taking into account the lower base temperature in the latter experiment, it appears that both the associative CO desorption and the desorption of molecularly bound CO species exhibit similar translational excitation if initiated with fs-laser pulses.

Zoom In Zoom Out Reset image size. From equation 1the temporal winows of the film temperature T f can be derived as follows:.