ghost states in ricc2

[jbaltrus]

Christof,

would ricc2 method help to avoid of (loosely defined) excited "ghost" states so prone in TDDFT? Incidentally, how would I determine if an excited state transition is due to the "ghost" state or if it's valid?

thanks

Kpmas

[christof.haettig]

Would you call 'ghost states'  are higher excited states with extreme red shifts due to the issues of TDDFT with charge transfer states, which is artifact of the popular semi-local DFT functionals.

Such problems are not present in wavefunction based methods as e.g. CC2.

Best wishes,
Christof