Abstract
| Original language | Undefined |
|---|---|
| Pages (from-to) | L23-L28 |
| Number of pages | 6 |
| Journal | Surface science |
| Volume | 574 |
| Issue number | 2-3 |
| DOIs | |
| Publication status | Published - 2005 |
Keywords
- IR-73069
- METIS-227097
Cite this
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A Quantitative Evaluation of the Dimer Concentration during the (2x1)-(1x1) Phase Transition on Ge(001). / van Vroonhoven, E.; Zandvliet, Henricus J.W.; Poelsema, Bene.
In: Surface science, Vol. 574, No. 2-3, 2005, p. L23-L28.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - A Quantitative Evaluation of the Dimer Concentration during the (2x1)-(1x1) Phase Transition on Ge(001)
AU - van Vroonhoven, E.
AU - Zandvliet, Henricus J.W.
AU - Poelsema, Bene
PY - 2005
Y1 - 2005
N2 - We propose a new quantitative model of the high-temperature (2 × 1)-(1 × 1) phase transition on Ge(0 0 1). We demonstrate that the transition is driven by an entropy facilitated breakup of dimers. A full quantitative description of the reversible variation of the dimer concentration requires incorporation of vibration entropy, not only of the topmost atoms, but also of those in two layers beneath. The main ingredients of our new model include the dimer formation energy and the difference in vibration entropy between the reconstructed (2 × 1) and the bulk-terminated (1 × 1)-phase. This entropy difference amounts to about 1.4 meV/K and the obtained dimer formation energy of 1.5 ± 0.2 eV is in good agreement with calculated values.
AB - We propose a new quantitative model of the high-temperature (2 × 1)-(1 × 1) phase transition on Ge(0 0 1). We demonstrate that the transition is driven by an entropy facilitated breakup of dimers. A full quantitative description of the reversible variation of the dimer concentration requires incorporation of vibration entropy, not only of the topmost atoms, but also of those in two layers beneath. The main ingredients of our new model include the dimer formation energy and the difference in vibration entropy between the reconstructed (2 × 1) and the bulk-terminated (1 × 1)-phase. This entropy difference amounts to about 1.4 meV/K and the obtained dimer formation energy of 1.5 ± 0.2 eV is in good agreement with calculated values.
KW - IR-73069
KW - METIS-227097
U2 - 10.1016/j.susc.2004.11.009
DO - 10.1016/j.susc.2004.11.009
M3 - Article
VL - 574
SP - L23-L28
JO - Surface science
JF - Surface science
SN - 0039-6028
IS - 2-3
ER -