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# fix drude command

## Syntax

    fix ID group-ID drude flag1 flag2 ... flagN

- ID, group-ID are documented in fix command

- drude = style name of this fix command

- flag1 flag2 … flagN = Drude flag for each atom type (1 to N) in the system

## Examples

    fix 1 all drude 1 1 0 1 0 2 2 2
    fix 1 all drude C C N C N D D D

Example input scripts available: examples/PACKAGES/drude

## Description

Assign each atom type in the system to be one of 3 kinds of atoms within the Drude polarization model. This fix is designed to be used with the thermalized Drude oscillator model. Polarizable models in LAMMPS are described on the Howto polarizable doc page.

The three possible types can be designated with an integer (0,1,2) or capital letter (N,C,D):

- 0 or N = non-polarizable atom (not part of Drude model)

- 1 or C = Drude core

- 2 or D = Drude electron

## Restrictions

This fix should be invoked before any other commands that implement the Drude oscillator model, such as fix langevin/drude, fix tgnvt/drude, fix drude/transform, compute temp/drude, pair_style thole.

## Related commands

fix langevin/drude, fix tgnvt/drude, fix drude/transform, compute temp/drude, pair_style thole

## Default

none