Element = Lattice = Model = Element: Si
Lattice: hcp
Model: Tersoff_LAMMPS_Tersoff_1988T3_Si__MO_186459956893_004
Computed model cutoff of 3.000000004544875 Angstroms
Computed isolated atomic energy of 0.0 eV for species Si

==============================================================================
==============================================================================
 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: -15.475145
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 2.755891721323136, total energy = -15.47514537655059

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: -15.475145
         Iterations: 39
         Function evaluations: 80
Results for this minimization:
  a = 2.7558917277026924, total energy = -15.475145376550607

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: -15.475145
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 2.755891725420952, total energy = -15.475145376550593

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: -15.475145
         Iterations: 37
         Function evaluations: 77
Results for this minimization:
  a = 2.755891723872633, total energy = -15.47514537655059

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: -15.475145
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 2.755891723511744, total energy = -15.4751453765506

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: -15.475145
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 2.7558917218819285, total energy = -15.475145376550573

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: -15.475145
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 2.7558917289599787, total energy = -15.475145376550582

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: -15.475145
         Iterations: 35
         Function evaluations: 73
Results for this minimization:
  a = 2.7558917273709085, total energy = -15.475145376550566

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: -15.475145
         Iterations: 36
         Function evaluations: 77
Results for this minimization:
  a = 2.755891729146244, total energy = -15.47514537655057

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: -15.475145
         Iterations: 35
         Function evaluations: 74
Results for this minimization:
  a = 2.75589173026383, total energy = -15.475145376550575

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: -15.475145
         Iterations: 36
         Function evaluations: 77
Results for this minimization:
  a = 2.7558917272835983, total energy = -15.47514537655057

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: -15.475145
         Iterations: 35
         Function evaluations: 73
Results for this minimization:
  a = 2.755891724920365, total energy = -15.475145376550584

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: -15.475145
         Iterations: 34
         Function evaluations: 71
Results for this minimization:
  a = 2.7558917253045365, total energy = -15.475145376550573

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: -15.475145
         Iterations: 33
         Function evaluations: 72
Results for this minimization:
  a = 2.75589172358159, total energy = -15.475145376550564

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: -15.475145
         Iterations: 33
         Function evaluations: 68
Results for this minimization:
  a = 2.75589172297623, total energy = -15.475145376550568

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: -15.475145
         Iterations: 33
         Function evaluations: 70
Results for this minimization:
  a = 2.7558917236048726, total energy = -15.475145376550568

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: -15.475145
         Iterations: 34
         Function evaluations: 71
Results for this minimization:
  a = 2.755891726724803, total energy = -15.475145376550572

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: -15.475145
         Iterations: 34
         Function evaluations: 70
Results for this minimization:
  a = 2.7558917237911373, total energy = -15.475145376550568

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 = [2.75589173] Angstroms and c = 3.6002818769220037 = ([1.30639453] * a) Angstroms

Optimization terminated successfully.
         Current function value: -17.246345
         Iterations: 76
         Function evaluations: 161
Results for this minimization:
  a = 3.5697962670573293, c = 2.9973064958685316, total energy = -17.24634521796734

Attempting to perform relaxation using initial lattice constant guess of a = [2.75589173] Angstroms and c = 3.825299494229629 = ([1.38804419] * a) Angstroms

Optimization terminated successfully.
         Current function value: -17.246345
         Iterations: 80
         Function evaluations: 166
Results for this minimization:
  a = 3.5697962046684077, c = 2.9973065767572686, total energy = -17.24634521796742

Attempting to perform relaxation using initial lattice constant guess of a = [2.75589173] Angstroms and c = 4.050317111537254 = ([1.46969385] * a) Angstroms

Optimization terminated successfully.
         Current function value: -17.246345
         Iterations: 83
         Function evaluations: 174
Results for this minimization:
  a = 3.5697961896259267, c = 2.997306618372557, total energy = -17.246345217967416

Attempting to perform relaxation using initial lattice constant guess of a = [2.75589173] Angstroms and c = 4.2753347288448795 = ([1.5513435] * a) Angstroms

Optimization terminated successfully.
         Current function value: -15.475145
         Iterations: 67
         Function evaluations: 141
Results for this minimization:
  a = 2.75588836060445, c = 4.500363320408639, total energy = -15.475145377219587

Attempting to perform relaxation using initial lattice constant guess of a = [2.75589173] Angstroms and c = 4.500352346152505 = ([1.63299316] * a) Angstroms

Optimization terminated successfully.
         Current function value: -15.475145
         Iterations: 64
         Function evaluations: 142
Results for this minimization:
  a = 2.755888400952208, c = 4.500363273231026, total energy = -15.47514537721965

Attempting to perform relaxation using initial lattice constant guess of a = [2.75589173] Angstroms and c = 4.72536996346013 = ([1.71464282] * a) Angstroms

Optimization terminated successfully.
         Current function value: -15.475145
         Iterations: 66
         Function evaluations: 146
Results for this minimization:
  a = 2.755888372915977, c = 4.500363299474972, total energy = -15.47514537721967

Attempting to perform relaxation using initial lattice constant guess of a = [2.75589173] Angstroms and c = 4.950387580767755 = ([1.79629248] * a) Angstroms

Optimization terminated successfully.
         Current function value: -15.475145
         Iterations: 71
         Function evaluations: 158
Results for this minimization:
  a = 2.755888340489067, c = 4.500363384712909, total energy = -15.47514537721954

Attempting to perform relaxation using initial lattice constant guess of a = [2.75589173] Angstroms and c = 5.175405198075381 = ([1.87794214] * a) Angstroms

Optimization terminated successfully.
         Current function value: -15.475145
         Iterations: 75
         Function evaluations: 166
Results for this minimization:
  a = 2.7558883862726917, c = 4.500363235405126, total energy = -15.475145377219707

Attempting to perform relaxation using initial lattice constant guess of a = [2.75589173] Angstroms and c = 5.400422815383006 = ([1.95959179] * a) Angstroms

Optimization terminated successfully.
         Current function value: -15.475145
         Iterations: 95
         Function evaluations: 202
Results for this minimization:
  a = 2.7558883937789407, c = 4.500363221002249, total energy = -15.475145377219642