2009
DOI: 10.1039/b810769f
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Abstract: Helium-3 spin-echo (3HeSE) is a powerful, new experimental technique for studying dynamical phenomena at surfaces with ultra-high energy resolution. Resolution is achieved by using the 3He nuclear spin as an internal timer, to enable measurement of the energy changes of individual atoms as they scatter. The technique yields a measurement of surface correlation in reciprocal space and real time, and probes the nanometre length scales and picosecond to nanosecond timescales that are characteristic of many import… Show more

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Cited by 45 publications
(102 citation statements)
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References 84 publications
(171 reference statements)
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“…This function provides us information about the time decay associated with the position of the adparticle, which is initially located at R(0) and, after a time t, it will be in a position R(t), as it can be inferred from the autocorrelation function (1). In spin-echo experimental techniques, this function is proportional to the polarization, with the real and imaginary parts of the latter being observable magnitudes [1][2][3].…”
Section: Flat Surfacesmentioning
confidence: 99%
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“…This function provides us information about the time decay associated with the position of the adparticle, which is initially located at R(0) and, after a time t, it will be in a position R(t), as it can be inferred from the autocorrelation function (1). In spin-echo experimental techniques, this function is proportional to the polarization, with the real and imaginary parts of the latter being observable magnitudes [1][2][3].…”
Section: Flat Surfacesmentioning
confidence: 99%
“…In this regard, a novel analysis and (to some extent) new interpretation of quantum surface diffusion in terms of QZE and AZE (excluding tunneling mediated diffusion) is presented. The primary motivation of this work arises from the possibility at present to carry out surface diffusion experiments finely resolved in time by means of neutron [1] and 3 He spin-echo techniques [2,3]. From these experiments, one obtains the time-evolution of a quantity (namely the so-called polarization function) proportional to the intermediate scattering function, I(∆K, t) = e −i∆K·R(0) e i∆K·R(t) .…”
Section: Introductionmentioning
confidence: 99%
“…A quantification of the adsorbate-substrate frictional coupling can be achieved within the kinematic scattering approximation [35]. As further detailed in the SI [40], the ISF is directly related to the real-space motion ( ) of an ensemble of atoms adsorbates through the autocorrelation function of the coherent intermediate amplitudes…”
mentioning
confidence: 99%
“…Corresponding trajectories ( ) are conveniently obtained from Langevin MD simulations, in which the overall friction coefficient is varied until optimum agreement with the experimental decay rates is obtained [34,35,41]. Specifically, in the current work we employed a system of atoms = 200 adatoms in a supercell consisting of an (49 × 82) array of rectangular Cu(111) unit cells and used = 155 K to match the experimental Na coverage and temperature.…”
mentioning
confidence: 99%
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