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Titolo:
Real-time x-ray scattering study of surface morphology evolution during ion erosion and epitaxial growth of Au(111)
Autore:
Murty, MVR; Curcic, T; Judy, A; Cooper, BH; Woll, AR; Brock, JD; Kycia, S; Headrick, RL;
Indirizzi:
Cornell Univ, Dept Phys, Ithaca, NY 14853 USA Cornell Univ Ithaca NY USA 14853 ll Univ, Dept Phys, Ithaca, NY 14853 USA Cornell Univ, Cornell Ctr Mat Res, Ithaca, NY 14853 USA Cornell Univ Ithaca NY USA 14853 ornell Ctr Mat Res, Ithaca, NY 14853 USA Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA Cornell Univ Ithaca NY USA 14853 h Appl & Engn Phys, Ithaca, NY 14853 USA Cornell Univ, Cornell High Energy Synchrotron Source, Ithaca, NY 14853 USACornell Univ Ithaca NY USA 14853 Synchrotron Source, Ithaca, NY 14853 USA Cornell Ctr Mat Res, Wilson Lab, Ithaca, NY 14853 USA Cornell Ctr Mat ResIthaca NY USA 14853 Wilson Lab, Ithaca, NY 14853 USA
Titolo Testata:
PHYSICAL REVIEW B-CONDENSED MATTER
fascicolo: 24, volume: 60, anno: 1999,
pagine: 16956 - 16964
SICI:
0163-1829(199912)60:24<16956:RXSSOS>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-BEAM EPITAXY; SCANNING TUNNELING MICROSCOPY; BY-LAYER GROWTH; ROUGHENING INSTABILITY; HOMOEPITAXY; RECONSTRUCTION; BOMBARDMENT; DIFFRACTION; DIFFUSION; GE(001);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Murty, MVR Cornell Univ, Dept Phys, Ithaca, NY 14853 USA Cornell Univ Ithaca NY USA 14853 pt Phys, Ithaca, NY 14853 USA
Citazione:
M.V.R. Murty et al., "Real-time x-ray scattering study of surface morphology evolution during ion erosion and epitaxial growth of Au(111)", PHYS REV B, 60(24), 1999, pp. 16956-16964

Abstract

We describe a detailed real-time x-ray scattering study of the evolution of the surface morphology of Au(111) both during ion erosion with 500-eV Arions, and during homoepitaxial growth. We monitor the erosion and growth morphologies as a function of substrate temperature. We also monitor the surface reconstruction, since it is known to play an important role in determining growth regimes on Pt( ill). Ion irradiation of Au(111) leads to surface morphology evolution by step retraction above 270 degrees C and quasi-layer-by-layer removal at 90-220 degrees C. The extent of the surface reconstruction on Au(111) during ion irradiation gradually decreases with decreasing temperature. While the herringbone reconstruction remains during ion irradiation at 270 degrees C, the long range order is lost and only the (22X root 3) reconstruction is present at 170 degrees C. We also observe layer-by-layer growth in the Au/Au(111) system at 55-145 degrees C, a result that differs from the usual behavior of homoepitaxy on fcc(111) surfaces. As in the layer-by-layer erosion regime, only the (22X root 3) reconstruction is present during layer-by-layer growth. Room temperature ion irradiation leads to a (1X1) surface structure and a three-dimensional rough morphology exhibiting pattern formation with a characteristic lateral length scale. Line-shape analysis of the diffuse scattering in transverse x-ray scans taken during low temperature ion irradiation, indicates that the characteristic lateral length scale increases with time consistent with a power law l similar to t(0.28). This agrees with a simple analysis of the position of the satellite peak in the diffuse scattering in these transverse x-ray scans. [S0163-1829(99)10647-7].

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Documento generato il 27/11/20 alle ore 01:33:19