Atomic Structure of the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">c</mi></math></span>( <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>4</mn><mo>×</mo><mn>2</mn></math></span>) Surface Reconstruction of Ge(001) as Determined by X-Ray Diffraction

S. Ferrer; X. Torrelles; V. H. Etgens; H. A. van der Vegt; P. Fajardo

doi:10.1103/PhysRevLett.75.1771

Atomic Structure of the $c$ ( $4 \times 2$ ) Surface Reconstruction of Ge(001) as Determined by X-Ray Diffraction

S. Ferrer, X. Torrelles, V. H. Etgens, H. A. van der Vegt, and P. Fajardo

Phys. Rev. Lett. 75, 1771 – Published 28 August 1995

Abstract

The $c (4 \times 2)$ reconstruction of Ge(001) has been studied by x-ray diffraction of 150 K by measuring in-plane reflections and out-of-plane intensities of fractional order rods. The structure consists of an alternate arrangement of buckled dimers (tilt angle $19^{\circ} \mp 1^{\circ}$ ) along the [110] and [ $1 \bar{1} 0$ ] surface directions. The dimer rows are not straight along the [110] direction but show a slight zigzag with an amplitude of $0.340 \mp 0.005$ Å.