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CONGEN uses a distinct system of units, the AKMA system. I.e.
**A**ngstroms, **K**ilocalories / **M**ole, **A**tomic mass units. All
distances are measured in Angstroms, energies in kcal/mole, mass in
atomic mass units, and charge is in units of electron charge. Using this
system, the AMKA unit of time is 4.888821E-14 seconds (based on the
constants tabulated
in Abramowitz and Stegun (1970)). 20 AKMA time units is .978 picoseconds
and is sometimes referred to as a "ps".

Angles are given in degrees for the analysis and constraint sections. In parameter files, the minimum positions of angles are specified in degrees, but the force constants for angles, dihedrals, and dihedral constraints are specified in kcal/mole/radian**2. Any numbers used in the documentation may be assumed to be in AKMA units unless otherwise noted.