Probability Density for an Electron Passing through Two Narrow Slits
This Demonstration shows the quantum mechanical probability distribution of an electron passing through two narrow slits, which produces an interference pattern.
The finite-difference Crank–Nicolson method with time-splitting is used to solve the Schrödinger equation.
For more information, see the Wikipedia entry for "Crank–Nicolson method".
 B. Thaller, Visual Quantum Mechanics, New York: Springer-TELOS, 2000.