In contrast to the simplicity of a spin adapted closed-shell coupled cluster theory, the formulation of a coupled cluster theory for open-shell systems is more complex.<br/>We present a spin adapted theory for doublet systems that uses the framework of a closed-shell coupled cluster implementation.<br/>From a fictitious closed-shell system a projection operator is used to obtain both the ground and excited states of the open-shell system.<br/>The approach scales as its closed-shell counterpart, with an O(N^4) scaling for CCS, and an O(N^6) scaling for CCSD.

Open-shell spin adapted coupled cluster theory using a closed-shell coupled cluster framework

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