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Originally posted by ddang100 at 2010-06-07 09:55:33:
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Support for constraints in Materials Studio
Materials Studio can maintain information about constraints in a 3D structure document. These constraints are imposed and modified using the Edit Constraints dialog. However, some modules in Materials Studio only honor certain types of constraints, while others ignore all constraints.

The modules that currently support constraints are listed below, along with details of the types of constraints that are supported:

CASTEP: Supports atom positions fixed in Cartesian space, fixed lattice parameters, and fixed interatomic distances, angles, and torsions, but ignores all combinations of constraints on the x, y, and z components of Cartesian atom positions and geometric constraints.
Discover: Supports atom positions fixed in Cartesian space, but ignores partial constraints on the x, y, or z components of Cartesian atom positions, constraints on fractional positions, and geometric constraints.
Note. It is not possible alter constraints between simulations when using the Restart option.

DFTB+: Supports atom positions fixed in Cartesian or fractional space and fixed lattice parameters, but ignores partial constraints on the x, y, or z components of Cartesian atom positions and geometric constraints.
DMol3: Supports atom positions fixed in Cartesian space, and partial constraints on the x, y, or z components of Cartesian atom positions, but ignores constraints on fractional positions and lattice parameters. Additionally, DMol3 supports fixed interatomic distances, angles, and torsions in nonperiodic structures.
Note. DMol3 does not support constraints for the TS Search task.

Forcite: Supports atom positions fixed in Cartesian or fractional space and fixed lattice parameters, but ignores partial constraints on the x, y, or z components of Cartesian atom positions and geometric constraints. Fractional constraints are not supported for Dynamics calculations.
GULP: Supports atom positions fixed in Cartesian or fractional space, but ignores constraints on lattice parameters, partial constraints on the x, y, or z components of Cartesian atom positions, and geometric constraints.
Mesocite: Supports bead positions fixed in Cartesian or fractional space and fixed lattice parameters, but ignores partial constraints on the x, y, or z components of Cartesian bead positions and geometric constraints. Fractional constraints are not supported for Dynamics calculations.
ONETEP: Supports atom positions fixed in Cartesian space and fixed lattice parameters, but ignores all combinations of constraints on the x, y, and z components of Cartesian atom positions and geometric constraints.
Note. ONETEP cannot change lattice geometry.

QMERA: The support of constraints depends on the task and algorithm chosen. All geometry optimizations and the Baker transition state optimization algorithms can use atoms fixed in Cartesian space, but will ignore partial constraints on the x, y, or z components of Cartesian atom positions. QMERA also supports fixed interatomic distances, angles, and torsions in HDLC geometry or transition state optimizations.
Note. In QMERA HDLC transition state optimizations, the atoms allowed to move are determined by the TS core atoms and constraints set in the structure document are silently ignored.

For HDLC optimizations fixed torsions, angles, or distances are only considered when all atoms involved are not fixed in Cartesian space. If a fixed atom is included in a measurement constraint, the measure will be silently ignored and the atomic constraint respected.

Reflex/Reflex Plus (Powder Refinement and Powder Solve): Supports fixed interatomic torsions and fixed lattice parameters, but ignores constraints on Cartesian and fractional atom positions and other geometric constraints.
Note. All the other Materials Studio modules ignore all the types of constraints that can be defined using the Edit Constraints dialog.
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