Element = Lattice = Model = Element: C
Lattice: hcp
Model: Tersoff_LAMMPS_Tersoff_1988_C__MO_579868029681_002
Computed model cutoff of 2.09999999832366 Angstroms
Computed isolated atomic energy of 0.0 eV for species C

==============================================================================
==============================================================================
 Starting optimization to find optimum lattice constant 'a' with c/a fixed to
 sqrt(8/3)
==============================================================================
==============================================================================


Attempting to perform relaxation using initial lattice constant guess of a = 1.0 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 36
         Function evaluations: 74
Results for this minimization:
  a = 1.928696263022723, total energy = -11.937177559613884

Attempting to perform relaxation using initial lattice constant guess of a = 1.125 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 37
         Function evaluations: 75
Results for this minimization:
  a = 1.9286962643789596, total energy = -11.93717755961389

Attempting to perform relaxation using initial lattice constant guess of a = 1.25 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 36
         Function evaluations: 73
Results for this minimization:
  a = 1.9286962656769902, total energy = -11.937177559613886

Attempting to perform relaxation using initial lattice constant guess of a = 1.375 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 35
         Function evaluations: 73
Results for this minimization:
  a = 1.9286962658166904, total energy = -11.937177559613888

Attempting to perform relaxation using initial lattice constant guess of a = 1.5 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 34
         Function evaluations: 70
Results for this minimization:
  a = 1.9286962651647641, total energy = -11.93717755961389

Attempting to perform relaxation using initial lattice constant guess of a = 1.625 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 1.9286962634883826, total energy = -11.937177559613882

Attempting to perform relaxation using initial lattice constant guess of a = 1.75 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 1.9286962665850294, total energy = -11.937177559613891

Attempting to perform relaxation using initial lattice constant guess of a = 1.875 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 32
         Function evaluations: 66
Results for this minimization:
  a = 1.9286962666665204, total energy = -11.93717755961389

Attempting to perform relaxation using initial lattice constant guess of a = 2.0 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 33
         Function evaluations: 70
Results for this minimization:
  a = 1.9286962665617464, total energy = -11.937177559613884

Attempting to perform relaxation using initial lattice constant guess of a = 2.125 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -11.937178
         Iterations: 34
         Function evaluations: 71
Results for this minimization:
  a = 1.9286962651647621, total energy = -11.937177559613884

Attempting to perform relaxation using initial lattice constant guess of a = 2.25 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.25, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 2.375 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.375, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 2.5 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.5, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 2.625 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.625, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 2.75 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.75, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 2.875 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.875, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 3.0 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.0, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 3.125 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.125, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 3.25 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.25, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 3.375 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.375, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 3.5 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.5, total energy = 0.0

==============================================================================
==============================================================================
 Starting optimization with both a and c/a relaxed
==============================================================================
==============================================================================


Attempting to perform relaxation using initial lattice constant guess of a = [1.92869627] Angstroms and c = 2.5196382517035945 = ([1.30639453] * a) Angstroms

Optimization terminated successfully.
         Current function value: -17.846241
         Iterations: 76
         Function evaluations: 157
Results for this minimization:
  a = 2.5395535760348906, c = 2.0983098092948187, total energy = -17.846241336992506

Attempting to perform relaxation using initial lattice constant guess of a = [1.92869627] Angstroms and c = 2.6771156424350693 = ([1.38804419] * a) Angstroms

Optimization terminated successfully.
         Current function value: -17.846241
         Iterations: 79
         Function evaluations: 168
Results for this minimization:
  a = 2.5395535928975788, c = 2.0983098090093955, total energy = -17.84624133699252

Attempting to perform relaxation using initial lattice constant guess of a = [1.92869627] Angstroms and c = 2.834593033166544 = ([1.46969385] * a) Angstroms

Optimization terminated successfully.
         Current function value: -17.846241
         Iterations: 72
         Function evaluations: 150
Results for this minimization:
  a = 2.5395535772189834, c = 2.0983098176223587, total energy = -17.846241336992534

Attempting to perform relaxation using initial lattice constant guess of a = [1.92869627] Angstroms and c = 2.992070423898019 = ([1.5513435] * a) Angstroms

Optimization terminated successfully.
         Current function value: -17.846241
         Iterations: 72
         Function evaluations: 154
Results for this minimization:
  a = 2.5395535853970106, c = 2.098309812000022, total energy = -17.84624133699252

Attempting to perform relaxation using initial lattice constant guess of a = [1.92869627] Angstroms and c = 3.1495478146294937 = ([1.63299316] * a) Angstroms

Optimization terminated successfully.
         Current function value: -12.254208
         Iterations: 89
         Function evaluations: 199
Results for this minimization:
  a = 1.8475090448335063, c = 3.6368690940135613, total energy = -12.254208418787334

Attempting to perform relaxation using initial lattice constant guess of a = [1.92869627] Angstroms and c = 3.3070252053609686 = ([1.71464282] * a) Angstroms

Optimization terminated successfully.
         Current function value: -12.254208
         Iterations: 88
         Function evaluations: 194
Results for this minimization:
  a = 1.8475090478199863, c = 3.6919696156875363, total energy = -12.25420841878733

Attempting to perform relaxation using initial lattice constant guess of a = [1.92869627] Angstroms and c = 3.4645025960924434 = ([1.79629248] * a) Angstroms

Optimization terminated successfully.
         Current function value: -12.254208
         Iterations: 87
         Function evaluations: 199
Results for this minimization:
  a = 1.8475090448330722, c = 3.647536421472951, total energy = -12.254208418787334

Attempting to perform relaxation using initial lattice constant guess of a = [1.92869627] Angstroms and c = 3.621979986823918 = ([1.87794214] * a) Angstroms

Optimization terminated successfully.
         Current function value: -12.254208
         Iterations: 85
         Function evaluations: 190
Results for this minimization:
  a = 1.8475090466522643, c = 3.7978756622102785, total energy = -12.254208418787337

Attempting to perform relaxation using initial lattice constant guess of a = [1.92869627] Angstroms and c = 3.779457377555393 = ([1.95959179] * a) Angstroms

Optimization terminated successfully.
         Current function value: -12.254208
         Iterations: 80
         Function evaluations: 200
Results for this minimization:
  a = 1.8475090495467619, c = 3.9018189071227405, total energy = -12.254208418787337