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Changing Isotopic Mass with DMol3


I've been changing atomic masses using the Element Properties dialog. However, when I run a DMol3 calculation, the .outmol file shows the mass of the element as unchanged. This method worked fine for CASTEP, but I cannot figure out how to apply this change for DMol3.

Any help would be greatly appreciated.

Thank you.
CarstenCarsten (Accelrys) 
In a DMol3 run isotopes are not taken into account for thermodynamics properties.

The different masses are taken into account for the frequencies when Tools->Vibrational_Analysis->Calculate is used to calculate the frequencies.