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OQS-PCM(\u03c9) captures the delayed coupling between solute and solvent electronic dynamics, naturally accounting for polarization, dispersion, and energy dissipation\u2500while bridging the different solvation regimes arising from the distinct solute\u2013solvent electronic time scales. This framework provides a transparent, physically grounded description of van der Waals interactions of a molecule with its environment, as well as the effect of fluctuations on electronic excitations. Simulation of absorption spectra in water and benzene provides insight into the role of environmental time scales in solvatochromism and energy redistribution. These results demonstrate the potential of OQS-PCM(\u03c9) for predictive modeling of optoelectronic properties, photophysics, and the design of molecular systems strongly influenced by environmental electronic dynamics.<\/jats:p>","DOI":"10.1021\/acs.jctc.6c00904","type":"journal-article","created":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T16:04:25Z","timestamp":1786550665000},"page":"8466-8480","source":"Crossref","is-referenced-by-count":0,"title":["A Fully Frequency-Dependent\nFormulation of the Open\nQuantum System Polarizable Continuum Model"],"prefix":"10.1021","volume":"22","author":[{"given":"Gabriel","family":"Gil","sequence":"first","affiliation":[{"name":"Universita\u0300 del Piemonte Orientale , , Viale T. Michel 11 , ,","place":["Alessandria, Italy, 15121"]},{"name":"Instituto de Ciberne\u0301tica, Matema\u0301tica y Fi\u0301sica (ICIMAF) , Calle E esquina 15, No. 309 , ,","place":["La Habana, Cuba, 10400"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6707-108X","authenticated-orcid":true,"given":"Stefano","family":"Corni","sequence":"additional","affiliation":[{"name":"University of Padova , , via Marzolo 1 , ,","place":["Padova, Italy, 35100"]},{"name":"CNR Institute of Nanoscience , via Campi 213\/A , ,","place":["Modena, Italy, 41100"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1924-2862","authenticated-orcid":true,"given":"Ciro A.","family":"Guido","sequence":"additional","affiliation":[{"name":"Universita\u0300 del Piemonte Orientale , , Viale T. 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