it call l-bfgs-b routine till: - the convergence criteria defined in cg.optional are reached (f(i,j)<fmax for all i,j) - the algorithm is not able to find the smaller energy in spite of f>fmax - the maximum number of steps exceeds

 iquench = -5
 dt = 0.5 !/only in case last parameter >0/

This routine uses the same input file as Conjiged Gradients (iquench = -4). It does not use all parameters, but they must be there.

 0.1                  ! max displacement - NOT USED in BFGS
 0.1                  ! dummy argument - NOT USED in BFGS
 0.00000001           ! total energy tolerance  - NOT USED in BFGS
 0.001                 ! fmax - force tolerance - end of minimization if fij<fmax
 10000                 ! Max number of opt steps
 0                     !number of restarts in case ftot>fmax (it seems it nave no effect)
 0                    !if >0 then dt must be defined in fireball.in. Number of FIRE downhill steps after BFGS minimization "fails"

 iquench = -6
 dt = 0.5 !timestep in MD

This routine uses the same input file as Conjiged Gradients (iquench = -4). It does not use all parameters, but they must be there.

 0.1                  ! max displacement 
 0.5                  ! NOT USED in FIRE
 0.0              ! total energy tolerance  - the walker can make step uphill if Enew-Emin<Etol, Etol=0 => only downhill steps allowed
 0.001                 ! fmax - force tolerance - end of minimization if fij<fmax
 10000                 ! Max number of opt steps
 0                    ! NOT USED in FIRE minimization