Vibrations on Al surfaces covered by sodium

Rusina, G. G.; Eremeev, S. V.; Borisova, S. D.; Sklyadneva, I. Yu.; Чулков, Е. В.

doi:10.1016/j.susc.2005.12.077

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…12 However, recently surface phonons have been measured locally with atomic resolution by inelastic electron-tunneling spectroscopy ͑IETS͒. 13 In general, characteristic vibrational features on surfaces and in overlayers such as gap phonons on alkali and other metal surfaces, 4,8,11,12,[14][15][16][17][18][19] surface resonance vibrations, 2,20,21 step vibrational modes on vicinal surfaces, 6,7,22,23 overlayer phonon states, 3,9,24 adatomsubstrate stretch vibrations and the frustrated translation mode frequencies in submonolayer coverages 3,9,10,[25][26][27] are rather well understood. In these systems, vibrational modes are delocalized over an entire area ͑surface, lateral overlayer area, step-one dimensional area͒.…”

Section: Introductionmentioning

confidence: 99%

Vibrations of small cobalt clusters on low-index surfaces of copper: Tight-binding simulations

et al. 2008

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Vibrational properties ͑frequencies, polarizations, and lifetimes͒ of a single adatom, dimer, and trimer of Co on low-index Cu surfaces, Cu͑111͒, Cu͑001͒, and Cu͑110͒ are studied by using tight-binding second moment approximation interatomic interaction potentials. We show that structural and vibrational properties of the Co clusters strongly depend on the substrate orientation. The longest lifetimes of 1-2.5 ps have been found for high-frequency z-polarized vibrations in all the Co clusters considered. The shortest lifetimes of 0.1-0.8 ps have been obtained for low-frequency horizontal ͑frustrated translation͒ vibrational modes.

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Section: Introductionmentioning

confidence: 99%

Vibrations of small cobalt clusters on low-index surfaces of copper: Tight-binding simulations

et al. 2008

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“…On the other hand, the comparative study [77] of ordered structures Al(111)-( √ 3 × √ 3) and Al(001)-c(2 × 2) formed by sodium in a substitutional position and the analysis of the corresponding force constants revealed that the interaction between adsorbates and nearest-neighbor substrate atoms depends on a surface structure. For Al(111)-( √ 3 × √ 3)-Na this interaction is rather strong while Na-Na interaction in this system is very weak.…”

Section: Surface Orientation Effectmentioning

confidence: 99%

Vibrations of alkali metal overlayers on metal surfaces

Rusina

Eremeev

Echenique

et al. 2008

J. Phys.: Condens. Matter

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We review the current progress in the understanding of vibrations of alkalis adsorbed on metal surfaces. The analysis of alkali vibrations was made on the basis of available theoretical and experimental results. We also include in this discussion our recent calculations of vibrations in K/Pt(111) and Li(Na)/Cu(001) systems. The dependence of alkali adlayer localized modes on atomic mass, adsorption position and coverage as well as the dependence of vertical vibration frequency on the substrate orientation is discussed. The square root of atomic mass dependence of the vertical vibration energy has been confirmed by using computational data for alkalis on the Al(111) and Cu(001) substrates. We have confirmed that in a wide range of submonolayer coverages the stretch mode energy remains nearly constant while the energy of in-plane polarized modes increases with the increase of alkali coverage. It was shown that the spectrum of both stretch and in-plane vibrations can be very sensitive to the adsorption position of alkali atoms and substrate orientation.

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