# Ion Parameters in Amber99bsc1 Force Field

**URL:** <https://gromacs.bioexcel.eu/t/ion-parameters-in-amber99bsc1-force-field/11004>\
**Category:** User discussions\
**Tags:** forcefield\
**Created:** [January 10, 2025, 8:07pm UTC](https://gromacs.bioexcel.eu/t/ion-parameters-in-amber99bsc1-force-field/11004 "2025-01-10T20:07:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![fatemeh](https://avatars.discourse-cdn.com/v4/letter/f/9de053/32.png) [@fatemeh](https://gromacs.bioexcel.eu/u/fatemeh)\
**Post date:** [January 10, 2025, 8:07pm UTC](https://gromacs.bioexcel.eu/t/ion-parameters-in-amber99bsc1-force-field/11004/1 "2025-01-10T20:07:41Z")

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Hello,  
It is unclear to me which set of ion parameters is used in the BSC1 force field. I want to use the Smith-Dang ion parameters (Smith, D. E. & Dang, L. X. J. Chem. Phys. 100, 3757–3766 (1994).  
) in GROMACS? Any help is highly appreciated.  
Thank you in advance for your assistance!

Best regards,  
Fatemeh