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While the thermodynamics associated with this putative LLCP has been well characterized through numerical simulations, the dynamical properties of these two phases close to the critical point remain much less understood. In this work, we investigate their dynamical and spectroscopic features using machine-learning interatomic potentials. Dynamical analyses using the van Hove correlation function reveal that LDL exhibits very sluggish and heterogeneous molecular mobility, in contrast to the faster and more homogeneous dynamics of HDL. Infrared absorption (IR) spectra further show clear vibrational distinctions between LDL and HDL, in particular in the far IR region between 400 and 1000\u00a0cm\u22121. Together, these findings provide new dynamical fingerprints that clarify the microscopic behavior of supercooled water and offer valuable guidance for experimental efforts aimed at detecting the long-sought liquid\u2013liquid transition.<\/jats:p>","DOI":"10.1063\/5.0288343","type":"journal-article","created":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T10:40:42Z","timestamp":1760092842000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Dynamical heterogeneity in supercooled water and its spectroscopic fingerprints"],"prefix":"10.1063","volume":"163","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2760-3632","authenticated-orcid":false,"given":"Cesare","family":"Malosso","sequence":"first","affiliation":[{"name":"Laboratory of Computational Science and Modeling, IMX, \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne 1 , 1015 Lausanne,","place":["Switzerland"]},{"name":"SISSA \u2013 Scuola Internazionale Superiore di Studi Avanzati 2 , Trieste 34136,","place":["Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7565-7603","authenticated-orcid":false,"given":"Edward Danquah","family":"Donkor","sequence":"additional","affiliation":[{"name":"Department of Applied Science and Technology, Politecnico di Torino 3 , Torino 10129,","place":["Italy"]},{"name":"Condensed Matter and Statistical Physics (CMSP), The Abdus Salam Centre for Theoretical Physics 4 , Trieste 34151,","place":["Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3508-6663","authenticated-orcid":false,"given":"Stefano","family":"Baroni","sequence":"additional","affiliation":[{"name":"SISSA \u2013 Scuola Internazionale Superiore di Studi Avanzati 2 , Trieste 34136,","place":["Italy"]},{"name":"Consiglio Nazionale delle Ricerche \u2013 Istituto Officina dei Materiali, SISSA Unit 5 , Trieste 34136,","place":["Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3208-1488","authenticated-orcid":false,"given":"Ali","family":"Hassanali","sequence":"additional","affiliation":[{"name":"Condensed Matter and Statistical Physics (CMSP), The Abdus Salam Centre for Theoretical Physics 4 , Trieste 34151,","place":["Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2025,10,10]]},"reference":[{"key":"2025101006403679200_c1","doi-asserted-by":"publisher","first-page":"74","DOI":"10.1021\/cr068037a","article-title":"Water as an active constituent in cell biology","volume":"108","year":"2007","journal-title":"Chem. 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