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Animations**

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The following animations are given as Mathematica Notebooks (with extension .ma). They can be viewed by any viewer that has either a full working version of *Mathematica* on any platform, or a working version of the *Mathread* freeware viewing program that is available for the Macintosh, Windows PC, and NeXT environments. You can find the PC version to download here: mathrdr.exe . To obtain a reader for one of the other platforms, you should visit the following page: MathSource. Once you have the reader, and have downloaded a particular animation to your favorite platform, you can open the animation and select the desired graphics to animate, after which you should click on Graphics|Animation.

The scattering off of a double potential barrier is depicted in the following three animations, which show the probability distribution for finding a quantum mechanical particle of mass *m* at position *x*. Each of these animations refers to scattering of a particle by a potential given by:
*V(x)=V0, for |a|<|x|<|b|,* and *V(x)=0* elsewhere. These results were obtained in a system of units for which *m=1=hbar=a,* and *V=2=b.*

Potential Energy versus position x, *V(x)*

If you want a shorter download and can decompress a gzipped file, the above three Mathematica notebooks can be found in:

Animation 1, *e20.ma.gz* |
Animation 2, *e52.ma.gz* |
Animation 3, *e100.ma.gz*

These animations have been developed by Stephanie Staley and Chris H. Greene, *Copyright (c) 1995.*