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

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

Abstract

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).

Citation

Bennie, S. J., Curchod, B. F., Manby, F. R., & Glowacki, D. R. (2017). Pushing the Limits of EOM-CCSD with Projector-Based Embedding for Excitation Energies. Journal of Physical Chemistry Letters, 8(22), 5559-5565. https://doi.org/10.1021/acs.jpclett.7b02500

• Journal Article Type: Article
• Acceptance Date: Oct 27, 2017
• Online Publication Date: Oct 27, 2017
• Publication Date: Nov 16, 2017
• Deposit Date: Nov 6, 2017
• Publicly Available Date: Dec 1, 2017
• Journal: Journal of Physical Chemistry Letters
• Electronic ISSN: 1948-7185
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 22
• Pages: 5559-5565
• DOI: https://doi.org/10.1021/acs.jpclett.7b02500
• Public URL: https://durham-repository.worktribe.com/output/1340995