Pushing the Limits of EOM-CCSD with Projector-Based Embedding for Excitation Energies

Simon J. Bennie*, Basile F.E. Curchod, Frederick R. Manby, David R. Glowacki

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

21 Citations (Scopus)
232 Downloads (Pure)


The calculation of accurate excitation energies using ab initio electronic structure methods such as standard equation of motion coupled cluster singles and doubles (EOM-CCSD) has been cost prohibitive for large systems. In this work, we use a simple projector-based embedding scheme to calculate the EOM-CCSD excitation energies of acrolein solvated in water molecules modeled using density functional theory (DFT). We demonstrate the accuracy of this approach gives excitation energies within 0.01 eV of full EOM-CCSD, but with significantly reduced computational cost. This approach is also shown to be relatively invariant to the choice of functional used in the environment and allows for the description of systems with large numbers of basis functions (>1000) to be treated using state-of-the-art wave function methods. The flexibility of embedding to select orbitals to add to the excited-state method provides insights into the origins of the excitations and can reduce artifacts that could arise in traditional linear response time-dependent DFT (LR-TDDFT).

Original languageEnglish
Pages (from-to)5559-5565
Number of pages7
JournalJournal of Physical Chemistry Letters
Issue number22
Publication statusPublished - 16 Nov 2017


Dive into the research topics of 'Pushing the Limits of EOM-CCSD with Projector-Based Embedding for Excitation Energies'. Together they form a unique fingerprint.

Cite this