I would like to get some information regarding how to perform a ΔUKS calculation with the FX175-ωPBE. I have checked the orca manual but I am bit confused with these functional as its not available in default. Could anyone help me with the input file format. I read that we have to provide the different amounts of Fock exchange (FX) and range-separation parameters. If someone one could shine some information regarding this it would be really helpful. I am trying to use this in Orca 6.1.1.

FYI: I am new to these type of tuning the functions.

Best regards
Sid