PotentialCalculation.jl

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A Julia package to calculate potential energy between two molecules.

Fitting of potential energy is done by separate package.

Currently supported backendes are ORCA
and Psi4.

Installation

Hit “]” to enter “pkg>”

pkg> registry add https://github.com/MatrixLabTools/PackageRegistry
pkg> add PotentialCalculation

Basic usage

Load package

using PotentialCalculation

or if using parallelization (recommended).

using Distributed
@everywhere using PotentialCalculation

Creating inputs and doing basic calculation, where two molecules are calculated
with various distances and orientations from each other.

# Creating calculation method
mp2 = Calculator(
        "RI-MP2 RIJK TIGHTSCF",
        "aug-cc-pVTZ aug-cc-pVTZ/C def2/JK",
         Orca()
      )
# Creating argon atom
Ar = Cluster(zeros(3), AtomOnlySymbol("Ar"))
# File where other molecule is taken
trajfile="Some trajectory.xyz"
# Create input for calculations
inputs = create_inputs(
            trajfile,    # First molecule will be picked from here
            Ar,          # Second molecule will be picked from here
            mp2;         # Calculator to do electronic structure calculations
            nsaples=32,  # How many lines are calculated
            max_e=10000, # Maximum energy in cm⁻¹ -
                         #   limit to areas where energy is less than this
            npoints=50   # Number of points per line
        )  
# Do calculation
data = calculate_potential(inputs, save_file="save file")

New calculations with different method can be done on previous points.

#New method
ccf12 = Calculator(
           "CCSD(T)-F12/RI TIGHTSCF",
           "cc-pVDZ-F12 cc-pVDZ-F12-CABS cc-pVTZ/C",
           Orca(maxmem=4000)
        )
data2 = calculate_potential(
          "previous results file",
          ccf12,  # Calculate with this method now
          save_file="new save file",
          restart_file="restart file"
       )

To restart calculations from restart file.

data3 = continue_calculation(
          "restart file",
          Orca(maxmem=4000),
          save_file="final save file",
          restart_file="new restart file"
        )