# dft_keywords

This module contains the main keywords related to a DFT calculation or RS-DFT calculation, such as:

- `dft_keywords exchange_functional`
- `dft_keywords correlation_functional`
- `dft_keywords HF_exchange` : only relevent for the `rs_ks_scf()` program

The keyword for the range separation parameter \(\mu\) is the `ao_two_e_erf_ints mu_erf` keyword.

The keyword for the type of density used in RS-DFT calculation with a multi-configurational wave function is the `density_for_dft density_for_dft` keyword.

## EZFIO parameters

`exchange_functional```

  name of the exchange functional

  Default: short_range_LDA

`correlation_functional```

  name of the correlation functional

  Default: short_range_LDA

`HF_exchange```

  Percentage of HF exchange in the DFT model

  Default: 0.

## Providers

`dft_type`

  File : `dft_keywords/keywords.irp.f`

      character*(32)  :: dft_type

  defines the type of DFT applied: LDA, GGA etc …

  Needs:

  `correlation_functional` | `exchange_functional` |