NanoMEGAS was formed in 2004 by a team of scientists and experts in the field of electron crystallography and catalysis.  They have created advanced electron diffraction tools  dedicated to help TEM and X-ray users to solve unknown nanocrystal structures.

Spinning Star

NanoMEGAS  unique  precession  inteface  SPINNING STAR can be adapted  to any TEM ( old or brand  new  from 100-400 kv ) . By precessing  incident beam at a constant angle around a zone axis in combination with a similar  precession (descan) of the ED pattern below the specimen, the equivalent mechanism of the precession  of the specimen is obtained.


SPINNING STAR takes control  of  TEM coils in order that scanning and de-scanning of the beam are exactly compensated for any spot size and  any TEM ( even without STEM presence ) and in order that  ED  pattern remain stationary during precession.When  precession interface is switched on, is fully independent from working mode of the microscope. ;when precession is switched off, the system is fully disconnected  from  TEM.  With precession electron diffraction kinematically forbidden reflections and multiple scatterings are greatly reduced, making space group identification easier. and also  reduces sensitivity of ED intensities to crystal thickness,  misorientation effects and Ewald  sphere curvature.

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Using precession in a ED pattern  results to huge extension of  visible reflections at very high angles (diffraction  order up to 0.05 nm) and an important redistribution of electron  diffraction intensities due to the practical  elimination of dynamical diffraction/multiple diffraction contributions.

  • SPINNING STAR can easily be retrofitted to any (old  or  new) 100- 400 kV TEM
  • Precession is possible for any beam size  300 - 10 nm ( or less )
  • Precession is possible for  parallel or convergent beam
  • SPINNING STAR may  ENHANCE OR  UPGRADE capabilities of   new or  older  TEMs
  • Precession angle can vary continuously (0 - 70 mrad ) to reveal  true crystal symmetry.

[ 1 1 1 ]  cubic  ( a = 11.982 A )  mayenite  crystal  Ca12Al14O33

electron diffraction  reflections  turn  from  dynamical  to kinematical  by  continuously  increasing  precession angle from  0º to 3º  with  “spinning star”  precession unit   at  TEM

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Digistar is the current hardware version and the successor of spinning star. Digistar peforms exactly what spinningstar does but with digital controls.



ASTAR  -  Automatic phase and orientation mapping for TEM

-   ASTAR  can easily be retrofitted to any (old  or  new) 100- 400 kV TEM
-   TEM based  technique  similar  to  EBSD  for  SEM (with  much  higher  resolution  details)
-   Perform  detailed  orientation  maps  (Orientation  resol < 1º , < 5  nm step size) for  metals, ceramics , semiconductors  and   any  type of  diffracting  material, any crystal  symmetry, no sample  preparation
-   Perform  detailed  crystal  phase maps  (resolution  <  5  nm -TEM FEG , < 25 nm - LaB6 TEM)
-   Ultra-fast  data acquisition   (< 5 min ) (e.g. 5x 5 microns, 500 x 500 points)  with  CCD camera
-   Scanning in  combination  with precession  for  accurate  orientation and  phase maps
-   Generation of  simulated  ED patterns (templates)  for  all  possible  crystal  symmetries and comparison  with  experimental  ED patterns via cross – correlation  techniques. to retrieve  accurate phase  and  orientation maps  (any crystal  symmetry)

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