### frozen core approx. with soppa

Posted:

**09 Jun 2019, 13:56**Dear Dalton Community,

I'm calculating the dispersion coefficients using SOPPA(CCSD) and I want to use the frozen core approx. which is not the default one in Dalton.

Here is the example for Ne. It looks like Dalton does not recognize the command

.FREEZE

1 0

like e.g. for regular CCSD calculations.

The inputs and the output are attached. What is the best way to define the FC for such calculations?

I'm calculating the dispersion coefficients using SOPPA(CCSD) and I want to use the frozen core approx. which is not the default one in Dalton.

Here is the example for Ne. It looks like Dalton does not recognize the command

.FREEZE

1 0

like e.g. for regular CCSD calculations.

The inputs and the output are attached. What is the best way to define the FC for such calculations?