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Knowledge of the charge distribution on the molecular sites in these materials is key to understanding the origin of different ground states. We survey and discuss the C=C stretching modes in BEDT-TTF based molecular conductors, which are extremely crucial in the characterization of charge-ordered insulators and are recently linked to superconductivity in some compounds. Focusing on the known examples of BEDT-TTF+0.5 salts, we analyze the reliability of the C=C stretching modes for the determination of charge ordering and absolute site charge. Considering the charge-ordered states, a prominent shift in frequency of 141 cm\u22121 per elementary charge e for \u03bd27(b1u) and 98 cm\u22121\/e for \u03bd2(ag) can be clearly observed; however, the distribution resulting from different compounds spans over 20 cm\u22121. For nominal BEDT-TTF+0.5 compounds, the distribution of the resonance also extends around 20 cm\u22121, yielding an unexpectedly large uncertainty of \u0394\u03c1 \u2248 (\u00b10.04)e, which is presumably due to the influence of small differences in the structure. This highlights the limitations of charge\u2013frequency relations to detect small deviations in absolute charge values on molecular lattice sites and emphasizes the use of the relations to estimate charge-ordering, rather than absolute site charge.<\/jats:p>","DOI":"10.1063\/5.0343156","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T10:46:13Z","timestamp":1791542773000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Charge-sensitive vibrational modes in BEDT-TTF salts: Signatures of charge ordering and site charge"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-1647-9005","authenticated-orcid":false,"given":"Savita","family":"Priya","sequence":"first","affiliation":[{"name":"1. Physikalisches Institut, Universit\u00e4t Stuttgart 1 , Pfaffenwaldring 57, 70569 Stuttgart,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1907-052X","authenticated-orcid":false,"given":"Martin","family":"Dressel","sequence":"additional","affiliation":[{"name":"1. Physikalisches Institut, Universit\u00e4t Stuttgart 1 , Pfaffenwaldring 57, 70569 Stuttgart,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5070-0775","authenticated-orcid":false,"given":"Jesse","family":"Liebman","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy, Johns Hopkins University 2 , Baltimore, Maryland 21218,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6538-1292","authenticated-orcid":false,"given":"Natalia","family":"Drichko","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy, Johns Hopkins University 2 , Baltimore, Maryland 21218,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,10,9]]},"reference":[{"key":"2026100906460632500_c1","doi-asserted-by":"publisher","first-page":"471","DOI":"10.1103\/revmodphys.83.471","article-title":"Electrodynamics of correlated electron materials","volume":"83","year":"2011","journal-title":"Rev. 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