On Wed, Apr 09, 2008, Hu, Shaowen (JSC-SK)[USRA] wrote:
>
> I have another question. Is there a simple relation between saltcon in
> AMBER and kappa in NAB?
>
You can Google to find lots of derivations of Debye-Huckel theory, or look in
standard textbooks. In brief:
kappa**2 = (8 pi beta I)/epsilon, where I is the ionic strength, which is
the same as concentration for a 1-1 salt. Taking T=298.15 and epsilon=78.5,
gives:
kappa = sqrt( 0.10806d0 * saltcon )
where kappa is in Ang**-1 and saltcon is in mol/l. Hence, for a 1-1 saltcon
of 0.1 M, kappa is about 0.10395.
...dac
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Received on Fri Apr 18 2008 - 21:18:11 PDT
