Oxygen-induced p(3×1) reconstruction of the W(100) surface

Abstract

The oxidation of the W(100) surface at elevated temperatures has been studied using room temperature STM and LEED. High exposure of the clean surface to O 2 at 1500 K followed by flash-annealing to 2300 K in UHV results in the formation of a novel p(3 × 1) reconstruction, which is imaged by STM as a missing-row structure on the surface. Upon further annealing in UHV, this surface develops a floreted LEED pattern characteristic of twinned microdomains of monoclinic WO x , while maintaining the p(3×1) missing-row structure. Atomically resolved STM images of this surface show a complex domain structure with single and double W 010 rows coexisting on the surface in different domains.

ULTRATHIN Al FILM ON THE W(100) SURFACE

“…21 In the case of the oxygen contamination, the LEED pattern will show a p(2 × 1) or a p(3 × 1). 22,23 Our sample before Al deposition did not show the ( √ 2 × √ 2)R45 • , the (5 × 1), p(2 × 1) or p(3 × 1) LEED patterns and the energy scan curves also show that our sample is not contaminated by carbon, oxygen or hydrogen. We deposit Al atoms by an electron beam heating evaporator.…”

Asymmetry effects in atomically resolved STM images of Cu(014)-O and W(100)-O surfaces measured with MnNi tips

“…33 Briefly, a W͑100͒ surface was cleaned by repeated cycles of oxidation at 1750 K in 10 −6 Torr O 2 and flash annealing to 2500 K under UHV conditions. The oxidized surface was likewise produced by annealing at 1500 K in 10 −6 Torr O 2 for several hours, followed by repeated flash annealing to 2300 K in UHV until a sharp p͑3 ϫ 1͒ LEED pattern was obtained.…”

“…33 The boundaries separating these reconstruction domains are decorated by a penetrated oxide WO x .…”

The gold and oxygen (3×1) structures on W(112)

“…p(2 Â 1), p(5 Â 1), p(2 Â 2)) have been found to occur for oxygen on W(1 0 0), with even an incommensurate (5 Â 1) structure [5][6][7][8]. The high temperature (3 Â 1) and (3 Â 3) structure formed during oxida-tion of the W(1 0 0) surface [6,11,12], however, resembles the missing row p(2 Â 3) reconstruction of Mo(1 1 2) which can evolve into a p(1 Â 3) reconstructed MoO 2 (0 1 0) surface [25][26][27][28][29].…”

“…The stable oxidized surfaces are (perhaps surprisingly) very dependent upon the terminal surface. As expected, oxygen on the low index faces, like the W(1 0 0) surface, have been extensively studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14], but the oxidation of the (1 1 2) plane of W(1 1 2) surface has also attracted attention [14][15][16][17][18][19][20][21][22][23][24]. A number of structural phases at low temperature (e.g.…”