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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.

It is possible to adjust all relevant preparation parameters while LEED measuring is being carried out:

MBE LEED optic
MBE-LEED-optic with three visible crucibles
DCNQI/Ag(110) two coverages
Composition of two LEED images selected from an "LEED film"

Owing to the geometrical adaptation, the heaters only reduce the usable viewing area to a very small degree.

For further animations, see page Animated LEED Sequences

In this way, it is possible to record complete phase diagrams representing the development of a layer system.

Special Knudsen cells are designed for:

Elektonic MBE-LEED
MBE-LEED power supply

Further information:

Real-time monitoring of phase transitions of vacuum deposited organic films by molecular beam deposition LEED C. Seidel, J. Poppensieker, H. Fuchs Surface Science, vol.408, no.1-3, (1998), pp.223-31

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

Oriented growth of DMe-PTCDI on Ag(110) An LEED, XPS, AFM and STM characterisation C. Seidel, A. H. Schafer, H. Fuchs, Surface Science 459 (2000) 310-322

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