positron Posted June 8, 2006 Share Posted June 8, 2006 I know that when a beam of x-rays strike a crystal (covalent network lattice) that they will be reflected off in layers so that the resulting wavefront is in phase with all other waves. However, i have found 2 equations that are associated with this concept and am not sure which is the correct to use. Theres: {d sin(theta) = n * (lambda)} and {n * (lambda) = 2d sin(theta)} Can u tell me which is the appropriate equation and what the other one would be for. btw. soz for not using symbols, I would if i knew how Link to comment Share on other sites More sharing options...
Klaynos Posted June 8, 2006 Share Posted June 8, 2006 [math]2dSin\theta = n \lambda[/math] That's the bragg diffraction equation: http://en.wikipedia.org/wiki/Bragg_diffraction I'm not familiar with the one without 2 in it... Link to comment Share on other sites More sharing options...
swansont Posted June 8, 2006 Share Posted June 8, 2006 The one without the 2 in it looks like Fraunhofer diffraction (e.g. through a slit). Click on the diffraction link of the Wiki article Klaynos provided. Link to comment Share on other sites More sharing options...
positron Posted June 10, 2006 Author Share Posted June 10, 2006 Thanks Link to comment Share on other sites More sharing options...
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