Example of Use of Small Hole Apertures

Data of Prof. Phillip H. Geil, University of Illinois

Characterization of single crystals of polyethylene terephthalate (PET), polymerized at 225 °C, 6 hours. Results show that only half of the twinned crystals contribute to the diffraction patter at any given time. Results obtained using SPI 2 µm gold foil thin film aperture. See J. Macromol. Sci. - Phys., B36(1), 61-85 (1997).


Bright field TEM of single crystals. Sale bar is 5 µm.


Dark field of the top half of the above field.



Diffraction pattern showing the reflection used for obtaining the above dark field image.



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