The phonon spectrum of Ag(100) in the direction measured by EELS

Rocca, M.; Risso, L.; Vicenzi, B.; Valbusa, U.

doi:10.1016/0039-6028(89)90649-3

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…However, at higher k the two curves are clearly distinguishable. At the X point the fitting procedure gives a maximal RW frequency of 70.3 cm −1 for 300 K which matches with the observation of Rocca et al [6]. At 86 K we obtain a higher value of 74.1 cm −1 which can be compared with the result of 73.4 cm −1 measured by HAS [17] for a surface temperature of 150 K. The X point RW frequency is depicted in the inset of figure 4 as function of temperature.…”

Section: Rayleigh Phononsupporting

confidence: 89%

“…The experimentally determined dispersion curve was well reproduced by calculations assuming force constants for the surface region similar to those of the bulk [5,7]. The results for Ag(100) could be explained with a minor or no change of the first interlayer spacing at 300 K [6]. In a subsequent study the phonon dispersion along the Γ-M direction of Ag(100) has been studied with special focus on the zone boundary since there the Rayleigh phonon is more sensitive to possible surface relaxations [8].…”

Section: Introductionsupporting

confidence: 56%

“…the dynamics at the Ag(100) surface [5]. However, in the first phonon dispersion study on clean Ag(100) by HREELS, Rocca et al detected only the Rayleigh mode along the Γ-X direction [6]. The experimentally determined dispersion curve was well reproduced by calculations assuming force constants for the surface region similar to those of the bulk [5,7].…”

Section: Introductionmentioning

confidence: 96%

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High-resolution phonon study of the Ag(100) surface

Kostov

Polzin

Widdra

2011

J. Phys.: Condens. Matter

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Using high-resolution electron energy loss spectroscopy the phonon dispersion of Ag(100) has been studied at two different sample temperatures of 86 and 300 K. The dominant feature in the spectra corresponds to the Rayleigh wave. Its full dispersion is determined along the ΓX high symmetry direction in the first and second Brillouin zones. The Rayleigh phonon maximum at the X point shows a redshift with increasing temperature. This is explained based on a surface anharmonicity with an anharmonicity constant of 0.014, comparable to the value reported for Cu(100). In the vicinity of the Γ point two additional phonon features have been discovered at about 110 and 160 cm(-1), which are tentatively assigned to high density of states features from the bulk phonon bands. However, the observed steep dispersion is in contrast to theoretical calculations. Along ΓX two surface resonance branches have been observed with maximum frequencies in the range of 90-110 cm(-1) near to the zone boundary. These branches agree with helium atom scattering data where available, but are not predicted by theory.

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Section: Rayleigh Phononsupporting

confidence: 89%

Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 96%

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High-resolution phonon study of the Ag(100) surface

Kostov

Polzin

Widdra

2011

J. Phys.: Condens. Matter

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“…A small relaxation would not be in contrast with the measured phonon spectrum. 5 We acknowledge the technical assistance of A. Gussoni, G. Maloberti, E. Cavanna, C. Tassistro, and P. Pozzo.…”

Section: <M?i)=<w 5 [L-td((q S )Qw + 0(q$)] Y (3)mentioning

confidence: 99%

“…4 The plasmon losses were measured with the EELS used in earlier experiments. 5 The energy resolution of the primary electron beam was lowered to 20 meV in order to improve the signal-to-noise ratio for off-specular measurements. The limiting factor in measuring plasmon dispersion at low impact energies is angular acceptance a of the EELS, which determines the 4ii resolution, a ranges between 1° and 1.5°.…”

mentioning

confidence: 99%

Angular dependence of dipole scattering cross section: Surface-plasmon losses on Ag(100)

Rocca¹,

Valbusa²

1990

Phys. Rev. Lett.

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We report high-resolution angular-resolved electron-energy-loss measurements of the cross section of surface-plasmon excitation. The intensity shows a pronounced minimum as a function of exchanged momentum near qw ""0 whose position depends on impact energy and angle of incidence of the electron beam and is determined by the value of the phase shift occurring in the scattering process. The effect has been taken into account in the determination of energy and dispersion of the surface plasmon of Ag(100). A linear dispersion is found in the range of qw between 0 and 0.15 A" 1 in contrast to the quadratic behavior found for Ag(l 11) and Ag(l 10). (Academic, New York, 1982). 2 ! H. Ibach and D. L Mills, Electron Energy Loss Spectroscopy and Surface Vibrations

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4.1.3 References for 4.1

Wallis¹,

Tong²

Electronic and Vibrational Properties

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The phonon spectrum of Ag(100) in the direction measured by EELS

Cited by 12 publications

References 25 publications

High-resolution phonon study of the Ag(100) surface

High-resolution phonon study of the Ag(100) surface

Angular dependence of dipole scattering cross section: Surface-plasmon losses on Ag(100)

4.1.3 References for 4.1

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