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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > September  >
In the Classroom
Overhead Projector Demonstrations
Using Overhead Projector to Simulate X-ray Diffraction Experiments
Veljko Dragojlovic
Department of Chemistry, Northwest Community College, 5331 McConnell Avenue, Terrace, BC, V8G 4C2, Canada
Cover
September 1999
Vol. 76 No. 9
p. 1240
Abstract
A demonstration to simulate X-ray diffraction experiments can be performed using an overhead projector. The glass surface of the overhead projector is covered with a piece of cardboard that has an 8-mm circular or square hole in the center. The projector is focused so that a circular, or square, spot is projected onto the screen. In the light-beam path we place a pattern made of a combination of transmission diffraction gratings. The obtained diffraction pattern depends on the combination of diffraction gratings. In a dark room, third-order diffraction spots are visible when relatively good-quality gratings are used. A projection distance of 2.4 m gives an 80-cm diffraction spacing (first order, red band) on the screen. As a classroom activity, the spacing between the lines of a grating or, once the spacing is known, the wavelength of diffracted light can be calculated.
More Information
*  Citation
 Dragojlovic, Veljko. J. Chem. Educ. 1999 76 1240.
*  Keywords
 Demonstrations; Introductory / High School Chemistry; Crystallography / Crystal Growth; Molecular Properties / Structure; Teaching / Learning Aids
*  History
 Created:
Last Updated:		 July 30, 1999
June 23, 2005
Full Text PDF corrected (February 2000).
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