Determination of (1×1) and (1×2) structures of Pt thin films on Pd(110) by dynamical low-energy electron-diffraction analysis

O. L. Warren, H.-C. Kang, P. J. Schmitz, P. A. Thiel, P. Kaukasoina, M. Lindroos
1993 Physical Review B (Condensed Matter)  
Geometric structures of (1×1) and (1×2) Pt thin films on Pd(110) have been determined by dynamical lowenergy electron-diffraction analysis. The (1×1) structure is found to exhibit relaxations in the first two interlayer spacings of Δd 12 =-11.0% and Δd 23 =6.6% at a Pt coverage of one monolayer, and relaxations of Δd 12 =-6.6% and Δd 23 =4.4% at two monolayers. As for the (1×2) structure, the top three layers are found to be Pt. The topmost layer is of the missing-row type, the second layer is
more » ... he second layer is slightly row paired (0.06 Å), and the third layer is significantly rumpled (0.23 Å). Relaxations in the first four interlayer spacings are found to be Δd 12 =-9.5%, Δd 23 =-8.0%, Δd 34 =-7.3%, and Δd 45 =2.2%. Except for a significantly less contracted first interlayer spacing, the (1×2) structure of the Pt film mimics the (1×2) structure of bulk Pt(110). Geometric structures of {1X 1) and {1X2) Pt thin films on Pd(110) have been determined by dynamical low-energy electron-diffraction analysis. The (1X1) structure is found to exhibit relaxations in the first two interlayer spacings of Ad12 = 11~0% and Ad23 =6.6% at a Pt coverage of one monolayer, and relaxations of Ad»= -6.6% and Ad»=4. 4% at two monolayers. As for the (1X2) structure, the top three layers are found to be Pt. The topmost layer is of the missing-row type, the second layer is slightly row paired (0.06 A), and the third layer is significantly rumpled (0.23 A). Relaxations in the first four interlayer spacings are found to be Ad» = -9.5%, 4d» = -8.0%, 4d34 -7.3%, and Ad45 =2.2%. Except for a significantly less contracted first interlayer spacing, the (1X2) structure of the Pt film mirnics the (1 X 2) structure of bulk Pt(110).
doi:10.1103/physrevb.47.10839 pmid:10005202 fatcat:7ykpnzplnrhzhdt2lbzpxxmoae