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The projection-based quantum embedding method is applied to electronicallyexcited states of valence, Rydberg, and charge-transfer character, valence- andcore-ionized states, as well as bound and temporary radical anions. We embeddifferent variants of equation-of-motion coupled-cluster singles and doubles(EOM-CCSD) theory in density functional theory and investigate the performanceof the resulting methods using small organic molecules microsolvated by avarying number of water molecules as test cases. States that are unstabletowards electron loss are treated by means of a complex-absorbing potential.Besides transition energies, we also present Dyson orbitals and naturaltransition orbitals for embedded EOM-CCSD. Our results illustrate that embeddedEOM-CCSD describes ionization and valence excitation very well and that thesetransitions are quite insensitive towards technical details of the embeddingprocedure. On the contrary, more care is required when dealing with Rydbergexcitations or electron attachment. For the latter type of transition inparticular, the use of long-range corrected density functionals is mandatoryand truncation of the virtual orbital space -- which is indispensable for theapplication of projection-based embedding to large systems -- proves to bedifficult.

Embedded equation-of-motion coupled-cluster theory for electronic excitation, ionization, electron attachment, and electronic resonances