Two conponent ricc2 calculation

[tayed]

Hi everybody,

I'm trying two do two do two component ricc2, the job is ended normally, but i have a questiion
in the output ricc2.out i have this information:
Energy of reference wave function is     0.0000000000000 I can't unterstand why?

Normally this value must be equal to the wave function fund on ridft calculation?

Any explication

Thanks in advance

[antti_karttunen]

Hi,

Isn't the two-component formalism implemented only for HF and DFT calculations(at least according to manual)?

Best wishes,
Antti

[uwe]

Hello,

you are both right: ricc2 is able to do two-component MP2 energy calculations, but this is not printed in the documentation (unfortunately).

Tayed: The energy of the Hartree-Fock step in ricc2 is simply read from the $energy keyword and is not re-computed from the orbitals. So ricc2 itself only computes the correlation energy. If the HF energy is zero, then you did start ricc2 from a job which did not contain an entry in the $energy section. In most cases $energy is written to an own file called energy - I guess you did copy the input files without energy and started ricc2 in the new directory ?

Regards,

Uwe