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We combine machine-learning molecular dynamics with a deep Wannier model to compute concentration-dependent IR spectra of aqueous NaCl with strongly constrained and appropriately normed (SCAN)-level accuracy. The spectra semiquantitatively reproduce the experimental blue shift, intensity enhancement, band narrowing, and isosbestic point of the O\u2013H stretching band. Dipole-current decomposition reveals two ionic effects. First, ions reshape the water IR response: by disrupting the hydrogen-bond network of first-shell water, they blue-shift the stretching band and suppress its intensity, with Na+ more disruptive than Cl\u2013. Second, ions themselves carry an IR response: the electronic polarization of Cl\u2013, driven by O\u2013H stretching of its hydrogen-bonded waters, adds high-frequency intensity essential for the isosbestic point. Because both effects are local and additive, spectra at any concentration can be reconstructed from hydration-shell and ionic contributions, a transferable framework for electrolyte IR spectra.<\/jats:p>","DOI":"10.1021\/acs.jpclett.6c02161","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T14:02:25Z","timestamp":1790690545000},"page":"11364-11373","source":"Crossref","is-referenced-by-count":0,"title":["How Ions Reshape\nthe Infrared Spectra of Aqueous NaCl"],"prefix":"10.1021","volume":"17","author":[{"given":"Chenxi","family":"Nie","sequence":"first","affiliation":[{"name":"Eastern Institute of Technology , , ,","place":["Ningbo, Zhejiang, China, 315200"]},{"name":"The Hong Kong Polytechnic University , , , ,","place":["Kowloon, Hong Kong SAR, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0876-1221","authenticated-orcid":true,"given":"Ming","family":"Yang","sequence":"additional","affiliation":[{"name":"The Hong Kong Polytechnic University , , , ,","place":["Kowloon, Hong Kong SAR, China, 999077"]},{"name":"The Hong Kong Polytechnic University , , , ,","place":["Kowloon, Hong Kong SAR, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4884-5523","authenticated-orcid":true,"given":"Zheng","family":"Yu","sequence":"additional","affiliation":[{"name":"Princeton University , , , ,","place":["Princeton, New Jersey, United States, 08544"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4146-703X","authenticated-orcid":true,"given":"Chunyi","family":"Zhang","sequence":"additional","affiliation":[{"name":"Eastern Institute of Technology , , ,","place":["Ningbo, Zhejiang, China, 315200"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,29]]},"reference":[{"key":"2026100811163922800_cit1","doi-asserted-by":"publisher","first-page":"2418700","DOI":"10.1002\/adma.202418700","article-title":"Aqueous Electrolytes:\nFrom Salt in Water to Water in Salt and Beyond","volume":"37","author":"Dong","year":"2025","journal-title":"Adv. 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