# arkane.ess.TeraChemLog¶

class arkane.ess.TeraChemLog(path, check_for_errors=True)

Represent a log file from TeraChem. The attribute path refers to the location on disk of the TeraChem log file of interest. Methods are provided to extract a variety of information into Arkane classes and/or NumPy arrays. TeraChemLog is an adapter for the abstract class ESSAdapter.

check_for_errors()

Checks for common errors in a TeraChem log file. If any are found, this method will raise an error and crash.

get_D1_diagnostic()

Returns the D1 diagnostic from output log. If multiple occurrences exist, returns the last occurrence. Should be implemented by the relevant subclass.

get_T1_diagnostic()

Returns the T1 diagnostic from output log. If multiple occurrences exist, returns the last occurrence. Should be implemented by the relevant subclass.

get_number_of_atoms()

Return the number of atoms in the molecular configuration used in the TeraChem output file. Accepted output files: TeraChem’s log file, xyz format file, TeraChem’s output.geometry file.

get_software()

Return the name of the software. Should correspond to the class name without ‘Log’.

get_symmetry_properties()

This method uses the symmetry package from RMG’s QM module and returns a tuple where the first element is the number of optical isomers, the second element is the symmetry number, and the third element is the point group identified.

Load the molecular degree of freedom data from an output file created as the result of a TeraChem “Freq” calculation. As TeraChem’s guess of the external symmetry number might not always correct, you can use the symmetry parameter to substitute your own value; if not provided, the value in the TeraChem output file will be adopted.

Load the energy in J/mol from a TeraChem log file. Only the last energy in the file is returned, unless the log file represents a frequencies calculation, in which case the first energy is returned. The zero-point energy is not included in the returned value.

Return the force constant matrix (in Cartesian coordinates) from the TeraChem log file. If multiple such matrices are identified, only the last is returned. The units of the returned force constants are J/m^2. If no force constant matrix can be found in the log file, None is returned.

Return the optimum geometry of the molecular configuration from the TeraChem log file. If multiple such geometries are identified, only the last is returned.

Return the imaginary frequency from a transition state frequency calculation in cm^-1.

Extract the optimized energies in J/mol from a TeraChem torsional scan log file.