\(\renewcommand{\AA}{\text{Å}}\)

# bond_style gaussian command

## Syntax

    bond_style gaussian

## Examples

    bond_style gaussian
    bond_coeff 1 300.0 2 0.0128 0.375 3.37 0.0730 0.148 3.63

## Description

The gaussian bond style uses the potential:

\[E = -k_B T ln\left(\sum_{i=1}^{n} \frac{A_i}{w_i \sqrt{\pi/2}} exp\left( \frac{-2(r-r_{i})^2}{w_i^2}\right)\right)\]

This analytical form is a suitable potential for obtaining mesoscale effective force fields which can reproduce target atomistic distributions (Milano)

The following coefficients must be defined for each bond type via the bond_coeff command as in the example above, or in the data file or restart files read by the read_data or read_restart commands:

- \(T\) temperature at which the potential was derived

- \(n\) (integer >=1)

- \(A_1\) (> 0, distance)

- \(w_1\) (> 0, distance)

- \(r_1\) (>= 0, distance)

- …

- \(A_n\) (> 0, distance)

- \(w_n\) (> 0, distance)

- \(r_n\) (>= 0, distance)

## Restrictions

This bond style can only be used if LAMMPS was built with the EXTRA-MOLECULE package. See the Build package doc page for more info.

## Related commands

bond_coeff

## Default

none

(Milano) G. Milano, S. Goudeau, F. Mueller-Plathe, J. Polym. Sci. B Polym. Phys. 43, 871 (2005).