# Collision frequency for Langevin thermostat

**URL:** <https://gromacs.bioexcel.eu/t/collision-frequency-for-langevin-thermostat/688>\
**Category:** User discussions\
**Created:** [August 20, 2020, 3:56am UTC](https://gromacs.bioexcel.eu/t/collision-frequency-for-langevin-thermostat/688 "2020-08-20T03:56:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Neena](https://avatars.discourse-cdn.com/v4/letter/n/bc79bd/32.png) [@Neena](https://gromacs.bioexcel.eu/u/Neena)\
**Post date:** [August 20, 2020, 3:56am UTC](https://gromacs.bioexcel.eu/t/collision-frequency-for-langevin-thermostat/688/1 "2020-08-20T03:56:51Z")

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GROMACS version: 2019.1  
GROMACS modification: No  
Here post your question

Where to set the collision frequency for a Langevin thermostat in mdp files? Is it the same as nsttcouple?

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**Author:** ![jalemkul](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/jalemkul/32/18_2.png) [@jalemkul](https://gromacs.bioexcel.eu/u/jalemkul)\
**Post date:** [August 20, 2020, 12:33pm UTC](https://gromacs.bioexcel.eu/t/collision-frequency-for-langevin-thermostat/688/2 "2020-08-20T12:33:52Z")

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No, it is `tau-t`: [http://manual.gromacs.org/current/user-guide/mdp-options.html#run-control](http://manual.gromacs.org/current/user-guide/mdp-options.html#run-control)