Gaussian wavepacket in a Potential: barrier of well. 
         Time dependent  Schrödinger  equation in one dimension 
       is solved for a wavepacket that encounters a barrier or a well
     (you choose the potential shape).
      
   Instructions
          -  Put the cursor with  the mouse in the region inside 
            the black rectangle, press the left button a drag the mouse until
              you have chose the potential shape you want to try. Release the button.
           
 -  Press "start" to begin and "stop" to finish.
           
 -  With Scrollbarselect the wavepacket momentum .