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This is usually used for dihedral angles
:
 |
(7.56) |
where
is CHARMM force constant,
is phase shift (tested for
0 and 180
), and
is periodicity (tested for 1, 2, 3, 4, 5, and 6).
The CHARMM phase value from the CHARMM parameter library corresponds to

. The force constant
can be negative, in effect offsetting
the phase
for 180
compared to the same but positive force constant.
 |
(7.57) |
Bozidar BJ Jerkovic
2001-12-21