Dialog Box - called from: Input1 Menu, Input Atoms dialog
The vectors can be cylinders or single lines; if cylinders, all will have the same radius.
The Scale factor should be in whatever units are necessary to convert the given lengths of the vectors (specified in the Vector Tab of the Revise Atom dialog) to suitable lengths in Angstroms. The length of the vector is measured from the surface of the atom to the end of the line or the cylindrical portion, except for double ended vectors (see below) in pen plots, in which the length is measured from the surface of the atom to the center of the sphere on the positive end..
You can choose to use the colors of each individual atom, or the color specified in this dialog.
If the Single-end, no arrow radio box is not checked, the vectors will be single lines or cylinders extending in one direction from the atom. The termination is a disk in Standard Drawing mode or a hemisphere in 3D Drawing mode. If the Single-end, arrow radio box is checked, the end will be marked with a cone (arrowhead) except in pen-plot output, in which the positive ends will be marked with a sphere. If the Double-ended box is checked, the vectors will extend in both directions from the atom, and the positive end will be marked with a cone (arrowhead).
The Radius increment for arrow gives the absolute increment in Angstroms of the radius of the base of the cone over the radius of the vector. The length of the arrow is determined by the Length/radius value. Likewise, the Radius increment for sphere (pen-plot only) gives the absolute increment in Angstroms of the radius of the sphere over the radius of the vector.
Vectors are drawn by adding pseudo-atoms to the list of generated atoms, and adding pseudo-bonds between these pseudo-atoms and the real atom to which the vector is attached. Thus if the length, orientation (Revise Atom dialog, Vector tab) or single/double-ended status is changed the structure must be recalculated, rather than just replotted. Also, since the length is computed as the visible cylindrical part of the vector, if you change atomic radii the vector lengths will change unless the structure is recalculated. In this dialog (Atomic Vectors), changing the scale factor will require recalculation, as will changing the vector radius, since this affects the length of the visible part of the vector (although this effect is slight).