Dialog Box - called from: Input1 Menu
This will give an animated view of thermal motion on the screen or in a movie file.
The information on vibrational modes must be obtained by importing a .MOT file written by the program VIBRATZ.
If you click the Movie button (after setting the parameters), you will be presented with the same dialog as in the Rotation or Vibration Movie dialog in the Rotation menu, to set image size, frame rate, etc.
A range of temperatures will be shown, as given by the Low limit, High limit and Increment - the amount of time spent at each temperature is determined indirectly by the Frames per cycle and Number of cycles each temperature parameters below.
A Scale for motion factor of 1 gives exactly the amplitude of motion determined by the quantum-mechanical formula for population of the modes (Planck distribution). The Scale for drawing factor multiplies the scaling of the entire drawing set in the Scaling and Centering dialog - often the drawing needs to be scaled down to accomodate the motion and the temperature lettering. The Minimum frequency can be set to exclude questionable or zero-frequency calculated modes.
The calculation is repeated and the image reshown at a time interval with respect to the vibration set by the Frames per cycle parameter, which is applied to the highest frequency. If you set this at 15 frames, and the frame rate in the Rotation or Vibration Movie dialog is also set to 15, then the highest frequency vibration will go through one cycle in a second - lower frequency vibrations will cycle more slowly. This number of frames is sampling an entire sine-wave cycle, so it should not be too small (if it is two, for example, no motion will be shown at all for the highest-frequency vibration). Then if the Number of cycles each temperature is set to 10, each temperature will be shown for 10 seconds.
When the animation is shown directly on screen there is no set real-time speed or time scaling - it is just shown as fast as it can be calculated. If this is too fast, increase the Frames per cycle.
If the Show temperature box is checked, the temperature in K will be shown in the lower left, using the selected font, magnified by the Font Factor.