Tip

All input files can be downloaded: Files.

thermo

This keyword defines the parameters for thermodynamic analysis based on frequency calculation results.

Options

temp

Value

A real number

Default

298.15

The temperature (in Kelvin) for thermodynamic analysis. The default value is 298.15 K.

pressure

Value

A real number

Default

1.

The pressure (in atm) for thermodynamic analysis. The default value is 1.0 atm.

point_group_delta

Value

A real number

Default

0.01

A threshold to determine the point group of the molecule. The default value is 0.01. The smaller point_group_delta, the more accurate the symmetry point group will be determined. However, a very small value may lead to failure in point group determination. If you encounter such problem, please increase this value gradually (e.g., to 0.1).

Theoretical Background

Input Examples

Example: XXXXXXX