File:StationaryStatesAnimation.gif

Summary[edit]

DescriptionStationaryStatesAnimation.gif	English: Three wavefunction solutions to the Time-Dependent Schrödinger equation for a harmonic oscillator. Left: The real part (blue) and imaginary part (red) of the wavefunction. Right: The probability of finding the particle at a certain position. The top two rows are the lowest two energy eigenstates, and the bottom is the superposition state ${\displaystyle \psi _{N}=(\psi _{0}+\psi _{1})/{\sqrt {2}}}$, which is not an energy eigenstate. The right column illustrates why energy eigenstates are also called "stationary states". Thus in every quantum stae,there are certain preferred positions of maximum probability
Date	20 March 2011
Source	Own work
Author	Sbyrnes321

(* Source code written in Mathematica 6.0 by Steve Byrnes, Feb. 2011. This source code is public domain. *)
(* Shows classical and quantum trajectory animations for a harmonic potential. Assume m=w=hbar=1. *)
ClearAll["Global`*"]
(*** Wavefunctions of the energy eigenstates ***)
psi[n_, x_] := (2^n*n!)^(-1/2)*Pi^(-1/4)*Exp[-x^2/2]*HermiteH[n, x];
energy[n_] := n + 1/2;
psit[n_, x_, t_] := psi[n, x] Exp[-I*energy[n]*t];
(*** A non-stationary state ***)
SeedRandom[1];
psinonstationary[x_, t_] := (psit[0, x, t]+psit[1, x, t])/Sqrt[2];

(*** Put all the plots together ***)
SetOptions[Plot, {PlotRange -> {-1, 1}, Ticks -> None, PlotStyle -> {Directive[Thick, Blue], Directive[Thick, Pink]}}];
MakeFrame[t_] := GraphicsGrid[
   {{Plot[{Re[psit[0, x, t]], Im[psit[0, x, t]]}, {x, -5, 5}, PlotLabel -> Subscript[\[Psi],0]], 
     Plot[Abs[psit[0, x, t]]^2, {x, -5, 5}, PlotStyle -> Directive[Thick, Black],
		PlotLabel -> TraditionalForm[Abs[Subscript[\[Psi],0]]^2]]},
   {Plot[{Re[psit[1, x, t]], Im[psit[1, x, t]]}, {x, -5, 5}, PlotLabel -> Subscript[\[Psi],1]], 
     Plot[Abs[psit[1, x, t]]^2, {x, -5, 5}, PlotStyle -> Directive[Thick, Black],
		PlotLabel -> TraditionalForm[Abs[Subscript[\[Psi],1]]^2]]},
   {Plot[{Re[psinonstationary[x, t]], Im[psinonstationary[x, t]]}, {x, -5, 5}, PlotLabel -> Subscript[\[Psi],N]], 
     Plot[Abs[psinonstationary[x, t]]^2, {x, -5, 5}, PlotStyle -> Directive[Thick, Black],
		PlotLabel -> TraditionalForm[Abs[Subscript[\[Psi],N]]^2]]}
   }, Frame -> All, ImageSize -> 300];
output = Table[MakeFrame[t], {t, 0, 4 Pi*40/41, 4 Pi/41}];
SetDirectory["C:\\Users\\Steve\\Desktop"]
Export["test.gif", output]

Licensing[edit]

I, the copyright holder of this work, hereby publish it under the following license:

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The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission. http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse