I am interested in using the CVS option in CI calculations to get core-excited states. I tried to use the MRCC program which possesses this option according to the manual (cvs=...). I performed some test calculations using MRCC with and without the CVS option and got the same results, in particular, the number of configurations was the same with and without that option. I wonder if someone has used this option in MRCC and could share their input. Here is my post about this issue at the MRCC forum:
https://www.mrcc.hu/index.php/forum/running-mrcc/324-cvs-option-doesn-t-seem-to-work
Kind regards, Evgeniy
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