# Input File Description ## Program: turbo_eels.x / turboEELS / Quantum Espresso (version: 6.4)
> > ### TABLE OF CONTENTS INTRODUCTION &lr_input prefix | outdir | restart | restart_step | lr_verbosity | disk_io &lr_control itermax | pseudo_hermitian | approximation | qi ### INTRODUCTION
> >         Input data format: { } = optional, [ ] = it depends.

> >     All quantities whose dimensions are not explicitly specified are in
> >     RYDBERG ATOMIC UNITS

> >     BEWARE: TABS, DOS <CR><LF> CHARACTERS ARE POTENTIAL SOURCES OF TROUBLE

> >     Comment lines in namelists can be introduced by a "!", exactly as in
> >     fortran code. Comments lines in ``cards'' can be introduced by
> >     either a "!" or a "#" character in the first position of a line.

> >     Structure of the input data:
> >     ===============================================================================

> >     &lr_input
> >       ...
> >     /

> >     &lr_control
> >       ...
> >     /
## Namelist: &lr_input
This namelist is always needed !
prefix | CHARACTER
Default: | 'pwscf'
>     Sets the prefix for generated and read files. The files
>     generated by the ground state pw.x run must have this
>     same prefix.
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outdir | CHARACTER
Default: | './'
>     The directory that contains the run critical files, which
>     include the files generated by ground state pw.x run.
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restart | LOGICAL
Default: | .false.
>     When set to .true., turbo_eels.x will attempt to restart
>     from a previous interrupted calculation. (see restart_step
>     variable).
>     Beware, if set to .false. turbo_eels.x will OVERWRITE any
>     previous runs.
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restart_step | INTEGER
Default: | itermax
>     The code writes restart files every restart_step iterations.
>     Restart files are automatically written at the end of
>     itermax Lanczos steps.
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lr_verbosity | INTEGER
Default: | 1
>     This integer variable controls the amount of information
>     written to standard output.
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disk_io | CHARACTER
Default: | 'default'
>         Fine control of disk usage. Currently only 'reduced' is
>     supported where no restart files are written, apart from
>     the 'default' mode.
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## Namelist: &lr_control
itermax | INTEGER
Default: | 500
>     Number of Lanczos iterations to be performed.
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pseudo_hermitian | LOGICAL
Default: | .true.
>     When set to .true. the pseudo-Hermitian Lanczos
>     algorithm is used. When set to .false. the
>     non-Hermitian Lanczos biorthogonalization algorithm
>     is used (which is two times slower).
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approximation | CHARACTER
Default: | 'TDDFT'
>     A string describing a level of theory:
>     'TDDFT'            - Time-Dependent Local Density Approximation or
>                          Time-Dependent Generalized Gradient Approximation
>                          (depending on the XC functional),
>     'IPA'              - Independent Particle Approximation,
>     'RPA_with_CLFE'    - Random Phase Approximation with
>                          Crystal Local Field Effects.
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qi | INTEGER
Default: | 1.0
>     The values of the transferred momentum
>     in Cartesian coordinates (i=1,2,3)
>     in units of 2pi/a0 (a0 = lattice parameter).
>     It must be specified as q1, q2, q3.
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This file has been created by helpdoc utility on Fri Mar 01 17:57:32 CET 2019.