X-ray standing waves (XSW) are used to measure the structure of the(√3 × √3)R 30° to (3 × 3)low-temperature phase transition for the 1/3 monolayer Sn/Ge(111) surface. A three-dimensional direct-space imaging approach, based on the summation of several hklXSW-measured Fourier coefficients, is demonstrated. At room temperature, the Sn atoms are found to occupy the T4-adsorption sites with one-third of the Sn atoms 0.45 Å higher than the remaining two-thirds. The (3 × 3)phase has no significant change in the XSW-measured structural parameters. This is consistent with an order-disorder-type phase transition.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 8 2004|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics