Dear Siesta users,

                                I have a problem on how it is defined the 
chemical potential of nitrogen if I use NH3. It is correct to estimate it in 
this way:

Energy(NH3) = u(N) + 3u(H) 

-Energy(NH3) is the total energy of NH3

-u(H) is the chemcial potential of H, for which I have used H2 to calculate it  
u(H) = E(H2)/2

-u(N) is the chemical potential of nitrogen.

It is expected that if I increase the size of the molecule, the u(N) will be 
larger?  For example if I use pyridinde, the u(N) will be larger than that in 
NH3?

Thanks in advance.

Have a nice weekend.

Best regards,

                             pablo

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