# OT_SOLVER

Specifications for the iterative OT solver. Note: only available within the Tamm-Dancoff approximation. Recommanded if excitations from multiple donor states take place. [Edit on GitHub]

## Keywords

- SECTION_PARAMETERS

- EPS_ITER

- MAX_ITER

- MINIMIZER

## Keyword descriptions

SECTION_PARAMETERS: logical = F

  Lone keyword: `T`

  Usage: &OT_SOLVER {logical}

  Enables the usage of the OT iterator solver [Edit on GitHub]

EPS_ITER: real = 1.00000000E-004

  Usage: EPS_ITER {double}

  Convergence threshold for the OT solver [Edit on GitHub]

MAX_ITER: integer = 50

  Usage: MAX_ITER {integer}

  Maximum number of iterations allowed for the OT solver [Edit on GitHub]

MINIMIZER: enum = DIIS

  Usage: MINIMIZER DIIS

  Valid values:

  - `CG` Conjugated gradient: safer

  - `DIIS` Direct inversion of the iterative subspace: faster

  Minimizer to be used with the OT solver [Edit on GitHub]