# BMHFT

Section can be repeated.

References: Fumi1964, Tosi1964

This section specifies the input parameters for BMHFT potential type. Functional form: V(r) = A * EXP(-B*r) - C/r^6 - D/r^8. Values available inside cp2k only for the Na/Cl pair. [Edit on GitHub]

## Keywords

- A

- ATOMS

- B

- C

- D

- MAP_ATOMS

- RCUT

- RMAX

- RMIN

## Keyword descriptions

A: real = [hartree]

  Usage: A {real}

  Defines the A parameter of the Fumi-Tosi Potential [Edit on GitHub]

ATOMS: string[2]

  Usage: ATOMS {KIND1} {KIND2}

  Defines the atomic kind involved in the BMHFT nonbond potential [Edit on GitHub]

B: real = [angstrom^-1]

  Usage: B {real}

  Defines the B parameter of the Fumi-Tosi Potential [Edit on GitHub]

C: real = [angstrom^6*hartree]

  Usage: C {real}

  Defines the C parameter of the Fumi-Tosi Potential [Edit on GitHub]

D: real = [angstrom^8*hartree]

  Usage: D {real}

  Defines the D parameter of the Fumi-Tosi Potential [Edit on GitHub]

MAP_ATOMS: string[2]

  Usage: MAP_ATOMS {KIND1} {KIND2}

  Defines the kinds for which internally is defined the BMHFT nonbond potential at the moment only Na and Cl. [Edit on GitHub]

RCUT: real = 4.12758223E+000 [angstrom]

  Usage: RCUT {real}

  Defines the cutoff parameter of the BMHFT potential [Edit on GitHub]

RMAX: real = [angstrom]

  Usage: RMAX {real}

  Defines the upper bound of the potential. If not set the range is the full range generate by the spline [Edit on GitHub]

RMIN: real = [angstrom]

  Usage: RMIN {real}

  Defines the lower bound of the potential. If not set the range is the full range generate by the spline [Edit on GitHub]