Man page - gmx-scattering(1)

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Manual

GMX-SCATTERING

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
COPYRIGHT

NAME

gmx-scattering - Calculate small angle scattering profiles for SANS or SAXS

SYNOPSIS

gmx scattering [ -f [<.xtc/.trr/...>] ] [ -s [<.tpr/.gro/...>] ]
[ -n [<.ndx>] ] [ -o [<.xvg>] ] [ -b <time> ] [ -e <time> ]
[ -dt <time> ] [ -tu <enum> ] [ -fgroup <selection> ]
[ -xvg <enum> ] [ -[no]rmpbc ] [ -[no]pbc ] [ -sf <file> ]
[ -selrpos <enum> ] [ -seltype <enum> ] [ -sel <selection> ]
[ -startq <real> ] [ -endq <real> ] [ -qspacing <real> ]
[ -binwidth <real> ] [ -mc-coverage <real> ] [ -seed <int> ]
[ -[no]norm ] [ -[no]mc ] [ -scattering-type <enum> ]

DESCRIPTION

gmx scattering calculates SANS and SAXS scattering curves using Debye method.

The scattering intensity, I(q), as a function of scattering angle q with averaging over frames.

Note that this is a new implementation of the SANS/SAXS utilities added in GROMACS 2024. If you need the old ones, use gmx sans-legacy or gmx saxs-legacy .

OPTIONS

Options to specify input files:
-f [<.xtc/.trr/...>] (traj.xtc) (Optional)

Input trajectory or single configuration: xtc trr cpt gro g96 pdb tng

-s [<.tpr/.gro/...>] (topol.tpr) (Optional)

Input structure: tpr gro g96 pdb brk ent

-n [<.ndx>] (index.ndx) (Optional)

Extra index groups

Options to specify output files:
-o [<.xvg>] (scattering.xvg) (Optional)

scattering intensity as a function of q

Other options:
-b <time> (0)

First frame (ps) to read from trajectory

-e <time> (0)

Last frame (ps) to read from trajectory

-dt <time> (0)

Only use frame if t MOD dt == first time (ps)

-tu <enum> (ps)

Unit for time values: fs, ps, ns, us, ms, s

-fgroup <selection>

Atoms stored in the trajectory file (if not set, assume first N atoms)

-xvg <enum> (xmgrace)

Plot formatting: xmgrace, xmgr, none

-[no]rmpbc (yes)

Make molecules whole for each frame

-[no]pbc (yes)

Use periodic boundary conditions for distance calculation

-sf <file>

Provide selections from files

-selrpos <enum> (atom)

Selection reference positions: atom, res_com, res_cog, mol_com, mol_cog, whole_res_com, whole_res_cog, whole_mol_com, whole_mol_cog, part_res_com, part_res_cog, part_mol_com, part_mol_cog, dyn_res_com, dyn_res_cog, dyn_mol_com, dyn_mol_cog

-seltype <enum> (atom)

Default selection output positions: atom, res_com, res_cog, mol_com, mol_cog, whole_res_com, whole_res_cog, whole_mol_com, whole_mol_cog, part_res_com, part_res_cog, part_mol_com, part_mol_cog, dyn_res_com, dyn_res_cog, dyn_mol_com, dyn_mol_cog

-sel <selection>

Selection for Scattering calculation

-startq <real> (0)

smallest q value (1/nm)

-endq <real> (2)

largest q value (1/nm)

-qspacing <real> (0.01)

spacing of q values (1/nm)

-binwidth <real> (0.1)

Bin width (nm) for P(r)

-mc-coverage <real> (0.2)

coverage of Monte Carlo (%)

-seed <int> (2023)

random seed for Monte Carlo

-[no]norm (no)

normalize scattering intensities

-[no]mc (yes)

use Monte Carlo to scattering intensities

-scattering-type <enum> (sans)

Scattering type: saxs, sans

SEE ALSO

gmx(1)

More information about GROMACS is available at <- http://www.gromacs.org/ >.

COPYRIGHT

2025, GROMACS development team