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Transfer Crossref. The two materials are acoustically adapted. The recombination of the atomic reactants is found to originate predominantly from oxidation of isolated ‘reactive’ carbon atoms, whereas oxidation of surface carbon with carbon—carbon bonds is not observed. The key questions one would like to address with investigations on ultrashort-laser-induced surface chemistry are the following; what is the driving force, the mechanism of a certain reaction pathway? From equation 1 , the temporal evolution of the film temperature T f can be derived as follows:. As a model system, we studied ultrathin epitaxial Bi films on Silicon with an abrupt interface and a low defect density. To characterize the energy release into the reaction products, the translational energy of the desorbing CO molecules along the surface normal is measured.

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The pulse energy and hence the incident fluence can be varied by a half-wave plate in conjunction with a thin-film polarizer without adjusting the pump power to the multipass amplifier provided by Nd: Sign up for new issue notifications.

It has a worldwide membership of around 50 comprising physicists from all sectors, as well as those with an interest in physics. This results in a set of equations analogous to the Fresnel equations in optics.

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At the interface conversion from longitudinal to transverse polarized acoustic modes and vice versa can occur. Chen G Thermal conductivity and ballistic-phonon transport in the cross-plane direction of superlattices Phys.

Finally, potentially incomplete thermal equilibration of the departing CO molecules with the Ru substrate, in principle, could also cause rather low translational energies.

It turned out that the values for E a extracted from modelling the experimental data frequently exceed the measured activation energies for desorption, e.

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Received 13 June Published 14 September However, one has to keep in mind that this vibrational damping of the nascent N 2 molecule relates to locations on the ground state PES beyond the transition state, whereas the nonadiabatic coupling in the excitation step of the fs-laser induced CO association corresponds to the ascending side of the desorption barrier.

Tully J C Surf.

This additionally assures that the CO detected in the various experiments reported here indeed results from associative formation of CO molecules. Thus, one might very well expect nonadiabatic effects to play a significant role also in the femtosecond fs -laser-induced associative desorption of Wijdows from Ru Pollack G L Kapitza resistance Rev. Kramers H A Physica 7 Crossref. The optical excitation energy of the ultrashort light pulse is deposited in the electronic subsystem of the metal substrate.

Thermal boundary conductance in heterostructures studied by ultrafast electron diffraction

Consequently, systems exhibiting dynamical cooling should also show a significant decrease of the sticking probability of impinging particles with increasing particle energy. The time-dependent reaction rate R t in surface femtochemistry and, finally, for comparison with the experiment, the gd-rh001 yield are discussed in more detail in the following subsection.

As a model system, we studied ultrathin epitaxial Bi films on Silicon with an abrupt interface and a low defect density. Sign up for new issue notifications. One might expect that due to the location of the barrier along the vibrational coordinate, excitation of the iwndows distance d will facilitate the CO associative desorption more than it does excitation of the distance coordinate z between the C—O and the Ru surface.

We offer the following tentative explanation for the remaining small discrepancy. Lines represent the gx-ru001 rate-weighted adsorbate temperatures T ads RW see text.

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After reaching the minimum the intensity recovers asymptotically on a ns timescale. Click here to close this overlay, or press the “Escape” key on your keyboard. This in turn may strongly influence the efficiency of a surface reaction.

Menzel D Surf. 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 quantify the efficiency of the laser-induced process, the CO desorption yield is measured in series of laser shots impinging the same spot on the adsorbate-covered Ru sample. Note the scaling factor of 0.

The key questions one would like to address with investigations on ultrashort-laser-induced surface chemistry are the following; what is the driving force, the mechanism of a certain reaction pathway? B Krenzer et al New J. However, careful qualitative and quantitative analyses based on frictional modelling of the adsorbate—substrate coupling reveals that the C—O association reaction is mediated by both substrate phonons and electrons.

The Institute of Physics IOP is a leading scientific society promoting physics and bringing physicists together for the benefit of all. Negative delays indicate the stronger pulse preceding the weaker one.

B 52 Crossref. Buy this article in print.