Products:
3-4 Crucible Evaporator
9 Crucible Evaporator
Metal Evaporator
MBE-LEED
Low Temperature Head
Ion Source
L. Proj. Pattern
Organic Molecules
Services:
Vacuum systems
Plasma etching
Consulting
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MBE LEED |
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
- substrate temperature
- deposition rate
- amount of deposition
while LEED measuring is carried out.
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Fig. 1: MBE-LEED-optic with the three crucibles visible |
Fig. 2: Composition of two LEED images selected from an "LEED film" |
Additional Figures:
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In this way, it is possible to record complete phase diagrams representing the development of a layer system.
Special Knudsen cells:
- Compensation of the magnetic field
- Low thermal crosstalk
- Minimized light emission
- No soiling of LEED optics
- Easy exchange of the substance crucibles
Owing to the geometrical adaptation, the crucibles obscure the usable viewing area only to a very small degree.
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| Fig 3: 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