# EXCITED_STATES

Sets the various options for Excited State Potential Energy Calculations [Edit on GitHub]

## Keywords

- SECTION_PARAMETERS

- DEBUG_FORCES

- DIFF_ORDER

- EPS_DELTA_RHO

- OVERLAP_DELTAT

- STATE

- XC_KERNEL_METHOD

## Keyword descriptions

SECTION_PARAMETERS: logical = F

  Lone keyword: `T`

  Usage: &EXCITED_STATES T

  Controls the activation of the excited states [Edit on GitHub]

DEBUG_FORCES: logical = F

  Lone keyword: `T`

  Usage: DEBUG_FORCES T

  Activate printing of intermediate forces in excited state force calculations. [Edit on GitHub]

DIFF_ORDER: integer = 6

  Usage: DIFF_ORDER 4

  Order of finite differentiation formula used for functional derivatives. [Edit on GitHub]

EPS_DELTA_RHO: real = 1.00000000E-003

  Usage: EPS_DELTA_RHO 1.E-02

  Step size for finite difference calculation of functional derivatives. [Edit on GitHub]

OVERLAP_DELTAT: logical = F

  Lone keyword: `T`

  Usage: OVERLAP_DELTAT

  Keyword for the computation of the overlap matrix between two consecutive time steps. [Edit on GitHub]

STATE: integer = 1

  Usage: STATE 2

  Excited state to be used in calculation. Negative values indicate state following. [Edit on GitHub]

XC_KERNEL_METHOD: enum = BEST_AVAILABLE

  Usage: XC_KERNEL_METHOD (BEST_AVAILABLE|ANALYTIC|NUMERIC)

  Valid values:

  - `BEST_AVAILABLE`

  - `ANALYTIC`

  - `NUMERIC`

  Method to evaluate XC Kernel contributions to forces [Edit on GitHub]