Equivalent ordered-mixed-surface-structures of p(4×4)-p4gm formed on Cu(001) by coadsorptions of Bi+Mg and Sb+Mg

Structure determination of the Cu(001)–c(4×4)-Sn surface by low-energy electron diffraction

“…The coverage of Sn adatoms of the ORN is 0.5 ML. It should be emphasized that a similar ORN structure had been found by our group in the case of coadsorption system of Sb + Mg and Bi + Mg on Cu(0 0 1) [18]. It exhibits a p(4 Â 4)p4gm structure for both cases, in which Sb (Bi) and Mg atoms are alternately located to form octagonal rings as shown in Fig.…”

“…Second, adsorbed metal atoms should have appropriate sizes with respect to that of Cu atom. For Sn we found that the average value of the distances Sn1-Sn1 and Sn1-Sn2 is 3.0 Å, and for Sb + Mg and Bi + Mg the average value of two different bond distances in the literature [18] is also 3.0 Å for the two coadsorption systems. Thus the size ratio of adatoms with respect to the substrate atom, $1.18 in the three cases, must be a good value to form the ORN.…”

Surface alloy model of p(2×2)Sb/Cu(001) from LEED I/V data

“…the sum of the energy ranges of all the LEED beams) was 1449 eV. Details of the experiments were similar to those of the previous studies [5][6][7][8][9][10][11][12][13].…”

“…Then Sb was evaporated onto the Cu surface from a home-made Knudsen cell at room temperature. Extra p(2 Â 2) Bragg spots were observed at sample temperature of 130 K. The intensities of 4 inequivalent integer-order Bragg reflections, (10), (11), (20), and (12), and 3 half-integer-order reflections (1/2 0), (3/2, 1/2), (1/2, 1/2) were recorded by a computer-controlled CCD camera in an energy range of 50-420 eV for normal incidence of the LEED electrons. The total energy range (i.e.…”

“…ÞR45 -Mg,Li [6,7], Cu(0 0 1)-ð ffiffiffi 5 p  ffiffiffi 5 p ÞR26:7 -Mg,K(Cs) [8], Cu(0 0 1)-cð2  2ÞR45 -Mg,Bi [9], Cu(0 0 1)-c(6  4)-Mg,Bi [8], Cu(0 0 1)-ffiffiffi 5 p  ffiffiffi 5 p R26:7 -Bi,K(Cs) [10], Cu(0 0 1)-(4  4)-Mg,Bi(Sb) [11], and Cu(0 0 1)-c(6  4)-Mn,Bi [12]. The number of structural models to be tested was limited by classifying the direct and indirect interactions of dissimilar atoms on a surface [13].…”