AMBER Archive (2008)

Subject: RE: AMBER: Regarding ff03 forcefield

From: Ross Walker (
Date: Fri Jul 25 2008 - 03:16:57 CDT

Hi Reena,


It is all atom - that is all H's are explicitly included.


In Amber 9 and 10 there are two versions, ff03 and ff03ua. The ua stands for
united atom. This was not present in AMBER 8 if I recall.


In leap you use leaprc.ff03 for the all atom version and leaprc.ff03ua for
the united atom version.


Good luck,



From: [] On Behalf Of
Reena .....
Sent: Friday, July 25, 2008 12:25 AM
Subject: AMBER: Regarding ff03 forcefield


Hi Users,

I wanted to clarifiy as to whether the ff03 forcefield with Amber 8 version
is an all atom or united atom FF. I was checking the amber 9 manual and got
confused so just wanted to confirm.


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