Section OPBEND

• Specifies the out of plane bend potential of the MM system.(Only defined for atom quadruples which are also defined as an improper pattern in the topology.)

• Section path: CP2K_INPUT / FORCE_EVAL / MM / FORCEFIELD / OPBEND

• This section can be repeated.

• Subsections

  • none

• Keywords

  • ATOMS
  • K
  • KIND
  • PHI0

• Keyword descriptions

  ATOMS
  	ATOMS {Word} {Word} {Word} {Word}
  	Defines the atomic kinds involved in the opbend.
  	This keyword cannot be repeated and it expects precisely 4 words.

  K
  	K {Real}
  	Defines the force constant of the potential
  	This keyword cannot be repeated and it expects precisely one real.
  	Default unit: [rad^-2*hartree]

  KIND
  	KIND {Keyword}
  	Define the kind of out of plane bend potential
  	This keyword cannot be repeated and it expects precisely one keyword.
  	Default value: HARMONIC
  	List of valid keywords: HARMONIC Functional Form (HARMONIC): 0.5 * K * [ PHI - PHI0 ]**2 MM2 Functional Form (MM2|MM3|MM4): K * [ PHI - PHI0 ]**2 MM3 Functional Form (MM2|MM3|MM4): K * [ PHI - PHI0 ]**2 MM4 Functional Form (MM2|MM3|MM4): K * [ PHI - PHI0 ]**2

  PHI0
  	PHI0 {Real}
  	Defines the phase of the potential.
  	This keyword cannot be repeated and it expects precisely one real.
  	Default unit: [rad]