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The MBE-LEED based on a conventional LEED system enables the preparation of layer systems under UHV conditions and LEED measurement to be carried out simultaneously. Thus, it becomes possible to observe and document the growth behavior of molecular layers in situ.
Suggested real-space model for the
superstructures of coronene on Ag(110)
(a) shows the initial and final states
of superstructure I and (b) the incompressible
superstructure II reflecting the twofold
symmetry of the substrate.
*
Real-space configuration of the two
superstructures of perylene on Ag(110).
(a) Intermediate
and (b) final superstructure. The curved arrows
indicate that molecules can rotate freely.
*
Real-space model of the
two major structures and their precursor and final state respectively.
The unit vectors were obtained from LEED and STM data, the orientations
of the molecules were taken from STM images only.
**
Suggested real-space model of the
4.3 X 4.3 superstructures (a) and the compression into a commensurate structure (b).
*
Real-space model of the first observed 4 X a2 structure (a) and its compression in the [1-10] direction and the final structure (b).
*
* Structural transitions of perylene and coronene on silver and gold surfaces:
A molecular-beam epitaxy LEED study
C. Seidel, R. Ellerbrake, L. Gross, and H. Fuchs, Physical Review. B Vol. 64 (2001) 195418
** Growing process and compressed phase of DMe-DCNQI on Ag(110) observed in the monolayer regime by LEED, XPS and STM
C. Seidel, H. Kopf and H. Fuchs, Physical Review. B Vol. 60 Nr. 20 (1999) 14341