Installation notes


For the impatient
The light-version can be executed directly in the browser without any installation (only Java must be installed). It solves the one-dimensional time-independent Schrödinger equation for arbitrary potentials by evaluating the wave function and the energy eigenvalues numerically.

Open directly in browser
Please click here to start the applet in the browser..

Local installation

  • Please download the zip archive (33kb) and extract it.
  • Open javapsi-light.html with your web browser.

  • Possible errors
    Usually the program should start in a new window. If this does not happen however, the following errors could be the reason:

  • The Java Virtual Machine (VM) is not installed on your system.
  • Go to, click the download button and install the VM.
  • The Java Runtime Environment (JRE) is not installed on your system. To install the JRE please do the following:

  • Go to
  • Choose the newest version.
  • Click on the JRE file, follow the instructions of the Sun page and install the JRE.
  • To check the installation type e.g. java -version.
  • You have to enable Java in your web browser.
  • If the applet is still not working feel free to contact me.

  • The complete version

    Most of the features are listed in the quantum mechanics documentation and the manual. The complete version covers the program parts 1d time-independent, 1d time-dependent and radial time-independent cases.

    Package installation
    Due to the three-dimensional plots (c.f. screenshots) JavaPsi needs the package Java3D, see
  • On Windows please go to the Java3D download page. The item at the top should usually be the right choice (JRE means Java Runtime Environment, SDK or JDK stands for Sun/Java Development Kit.)
  • Download the file (ca. 4 MB) and execute it.
  • Please do not change the recommended installation path. Java3D should be installed into the existing Java environment. (Otherwise you have to adjust some system variables, see here.)

  • On Linux and OpenGL Java3D can be installed, too, see and

  • If you have trouble when installing Java3D do not hesitate to contact me.

    Open directly in program
    Click here to open the applet in the brower.

    Local installation

  • Download and extract the archive (ca. 4,7 MB)
  • Now open the file javapsi.html with your browser.

  • Errors
    If you encounter problems with the program feel free to contact me.