Performance of Automatic Active Space Selection for Electronic Excitation Energies
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866918208007569408 |
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| author | Shirazi, Reza G. Zech, Alexander Pinski, Peter Rybkin, Vladimir V. |
| author_facet | Shirazi, Reza G. Zech, Alexander Pinski, Peter Rybkin, Vladimir V. |
| contents | Computation of electronic spectra is one of the most important applications of methods capturing static electron correlation, including complete-active-space self-consistent field (CASSCF) and post-CASSCF theories. Performance of these techniques critically depends on the active space construction, both in terms of accuracy and computational effort. In this work we benchmark the performance of automatic active space construction, as implemented in the Active Space Finder software, for the computation of electronic excitation energies. The multi-step procedure constructs meaningful molecular orbitals and selects the most suitable active space based on information from more approximate correlated calculations. It aims to tackle a key difficulty in computing excitation energies with CASSCF: choosing active spaces that are balanced for several electronic states. The Active Space Finder is tested with several established data sets of small and medium-sized molecules and shows encouraging results. We evaluate multiple setting configurations and provide practical recommendations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_05732 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Performance of Automatic Active Space Selection for Electronic Excitation Energies Shirazi, Reza G. Zech, Alexander Pinski, Peter Rybkin, Vladimir V. Chemical Physics Computation of electronic spectra is one of the most important applications of methods capturing static electron correlation, including complete-active-space self-consistent field (CASSCF) and post-CASSCF theories. Performance of these techniques critically depends on the active space construction, both in terms of accuracy and computational effort. In this work we benchmark the performance of automatic active space construction, as implemented in the Active Space Finder software, for the computation of electronic excitation energies. The multi-step procedure constructs meaningful molecular orbitals and selects the most suitable active space based on information from more approximate correlated calculations. It aims to tackle a key difficulty in computing excitation energies with CASSCF: choosing active spaces that are balanced for several electronic states. The Active Space Finder is tested with several established data sets of small and medium-sized molecules and shows encouraging results. We evaluate multiple setting configurations and provide practical recommendations. |
| title | Performance of Automatic Active Space Selection for Electronic Excitation Energies |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2511.05732 |