fix_modify AtC time_integration <descriptor> 
various time integration methods for the finite elements
 
verlet - atomic velocity update with 2nd order Verlet, nodal temperature update with 2nd order Verlet, kinetostats based on controlling force 
 fractional_step - atomic velocity update with 2nd order Verlet, mixed nodal momentum update, 2nd order Verlet for continuum and exact 2nd order Verlet for atomic contributions, kinetostats based on controlling discrete momentum changes
 gear - atomic velocity update with 2nd order Verlet, nodal temperature update with 3rd or 4th order Gear, kinetostats based on controlling power 
 
 fix_modify atc time_integration verlet  
  fix_modify atc time_integration fractional_step  
 
see fix atc command
none
 1.6.1
 1.6.1