CCSD(2) keyword
Gets Around
12:31:36 PM PST - Mon, Nov 10th 2014
Hi,

What task runs by CCSD(2) keyword?

Forum Vet
4:53:02 PM PST - Mon, Nov 10th 2014
Here is the reference

A second-order perturbative correction to the coupled-cluster singles and doubles method: CCSD(2)
Gwaltney, Steven R. and Head-Gordon, Martin, The Journal of Chemical Physics, 115, 2014-2021 (2001),
DOI:http://dx.doi.org/10.1063/1.1383589

Gets Around
11:35:30 PM PST - Mon, Nov 10th 2014
Thank you.

In the documentation there are some inconsistencies (http://nwchemgit.github.io/index.php/Release65:TCE):
CCSD(2)_T: CCSD and perturbative CCSD(T)T correction,
CCSD(2)_TQ: CCSD and perturbative CCSD(2) correction,
CCSDT(2)_Q: CCSDT and perturbative CCSDT(2)$_Q$ correction.

CCSD(2)_TQ keyword is not running.


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