# DFEP2

Performs density-fitted EP2 computations for RHF reference wavefunctions.

## General

### DF_BASIS_EP2

> Auxiliary basis set for EP2 density fitting computations. Defaults to a RI basis.

> - Type: string
> - Possible Values: basis string
> - Default: No Default

### EP2_CONVERGENCE

> What is the maximum number of iterations?

> - Type: conv double
> - Default: 5.e-5

### EP2_MAXITER

> What is the maximum number of iterations?

> - Type: integer
> - Default: 20

### EP2_NUM_EA

> Number of Electron Affinities to compute, starting with the LUMO.

> - Type: integer
> - Default: 0

### EP2_NUM_IP

> Number of Ionization Potentials to compute, starting with the HOMO.

> - Type: integer
> - Default: 3

### EP2_ORBITALS

> Explicitly pick orbitals to use in the EP2 method, overrides EP2_NUM_IP and EP2_NUM_EA options. Input array should be [[orb1, orb2], [], …] for each irrep.

> - Type: array
> - Default: No Default