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We introduce a simple exciton model to arbitrary open-shell singlet excited (OSE) states by incorporating nonlocal singlet correlation energy, derived from the corresponding triplet excited state, thereby bypassing the direct optimization of singlet states and approximate spin-projection schemes. This model achieves near-quantitative accuracy for low-lying valence and Rydberg excitations and successfully reproduces the absorption spectrum of Chlorophyll a and zinc phthalocyanine. For core excitations, we found an excellent agreement across K and L-edge excitations of first and second group elements and also successfully capture the distinct experimental X-ray absorption fingerprints of imidazole-imidazolium system in water without any empirical shifting. More importantly, this model also captures near-degeneracy behavior in the vicinity of the CI for photoisomerization of cis\u2013trans azobenzene, where standard TDDFT fails. These findings, collectively, position this simple model as a reliable and alternative \u0394SCF-like approach for modeling nontrivial excited-state phenomena.<\/jats:p>","DOI":"10.1021\/acs.jctc.6c00850","type":"journal-article","created":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T22:01:29Z","timestamp":1786053689000},"page":"8453-8465","source":"Crossref","is-referenced-by-count":0,"title":["Simple Model for\nChallenging Excited States: Low-Lying,\nCore-Level and Conical-Intersection Regimes"],"prefix":"10.1021","volume":"22","author":[{"given":"Raj","family":"Roy","sequence":"first","affiliation":[{"name":"NYU Shanghai , 567 West Yangsi Road , ,","place":["Shanghai, China, 200126"]},{"name":"NYU-ECNU Center for Computational Chemistry at NYU Shanghai , 3663 Zhongshang Road North , ,","place":["Shanghai, China, 200062"]},{"name":"New York University , , , ,","place":["New York, New York, United States, 10003"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7342-1453","authenticated-orcid":true,"given":"Abhisek","family":"Ghosal","sequence":"additional","affiliation":[{"name":"Northwestern University , , , ,","place":["Evanston, Illinois, United States, 60208"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,8,6]]},"reference":[{"key":"2026083118581028100_cit1","volume-title":"Principles of Molecular\nPhotochemistry: An Introduction","author":"Turro","year":"2009"},{"key":"2026083118581028100_cit2","doi-asserted-by":"publisher","first-page":"663","DOI":"10.1021\/jz201629p","article-title":"Manipulation\nof Charge Transfer Across Semiconductor Interface. 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