# fix_modify AtC extrinsic electron_integration command

## Syntax

    fix_modify <AtC fixID> extrinsic electron_integration <integration_type> [<num_subcycle_steps>]

-   AtC fixID = ID of [fix atc](fix_atc) instance
-   extrinsic electron_integration = name of the AtC sub-command
-   integration_type = *explicit* or *implicit* or *steady*
-   num_subcycle_steps = number of subcycle steps for the electron time
    integration (optional)

## Examples

``` LAMMPS
fix_modify AtC extrinsic electron_integration implicit
fix_modify AtC extrinsic electron_integration explicit 100
```

## Description

Switches between integration schemes for the electron temperature. The
number of subcycling steps used to integrate the electron temperature
for one LAMMPS timestep can be manually adjusted to capture fast
electron dynamics.

## Restrictions

For use only with the two_temperature type of the AtC fix (see [fix
atc](fix_atc) command)

## Related AtC commands

-   [fix_modify AtC command overview](atc_fix_modify)

## Default

*implicit* and *subcycle_steps* = 1