Date: Thu, 07 Mar 2002 10:24:53 -0700

Author: David Kardelis

Subject: RE: Crystal Difraction Simmulators


You can use fine mesh for the 4 fold symmetry to. The mesh they use for
sifting works great. I am sure someone makes a hexagonal mesh too. Try
McMaster Carr.


David Kardelis 451 E 400 N
Chairman, Dept of Chemistry and Physics Price, UT 84501
College of Eastern Utah
435-613-4201 (fax)

-----Original Message-----
From: Wolfgang Rueckner []
Sent: Thursday, March 07, 2002 10:07 AM
Subject: Re: Crystal Difraction Simmulators

Four-fold and six-fold symmetry can easily be made: Shine the laser
through a nylon stocking for four-fold. For six-fold, let a
suspension of polyballs (polystyrene scattering spheres) dry on the
microscope slide. They usually end up in close-packed hexagonal
domains. Shine the laser through one of the domains. Wolfgang

> I am in search of a vendor that would carry a set
>"optical crystals". These are not actually crystals, but instead are a
>set of glass slides (diffraction plates) which have various patterns of
>dots on each. The patterns are arranged to imitate the arrangement of
>atoms in a crystal lattice. When a laser is shined onto a slide, an
>optical diffraction pattern is projected, which is a visual
>representation of the X-ray diffraction pattern generated from a real
>crystal with the same lattice arrangement as the slide. They allow a
>teacher to demonstrate students the x-ray diffraction patterns
>associated with different crystalline structures.
> The set I have has an address on it: Bergsten
>Diffraction Plates, Palmyra Wisconsin but I have been unable to locate
>this company. If anyone knows of another source for these I'd appreciate
>knowing what
>that source is.
> Tony
>Tony Papirio
>Lab Director Physics Teaching Labs
>Dept. of Physics (fax) 413-545-1691
>218 Hasbrouck Physics Lab (voice)413-545-1296
>University of Massachusetts Email:
>Amherst, MA, 01003-3720