SYMMETRY STEP1=0.01 STEP2=1 Water, potential energy surface for H O 0.92 -1 0 0 0 0 1 H 0.92 0 104 -1 0 0 2 1 2 1 3 |
In this example, the potential energy surface for water is generated. For one
axis of the 2-D plot, the O-H bond length is varied from 0.92Å to 1.02Å, in 11 steps of 0.01Å, and in the other axis, the H-O-H angle is varied
from 104 to 114
in 11 steps of 1.0 degree. Because of the use of
symmetry, there are no variables to be optimized. If symmetry were not used,
then the second O-H bond length could either be optimized, by setting its flag
to 1, or held constant, by setting its flag to 0.
Keywords used with the GRID option are POINT1=n and POINT2=m: to use n and m points in directions 1 and 2; and keywords to specify how the geometry should be optimized. n x m should be less than 400000