{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T22:43:54Z","timestamp":1790808234236,"version":"4.1.0"},"reference-count":42,"publisher":"AIP Publishing","issue":"23","funder":[{"name":"NSF Graduate Research Fellowship Program"},{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["CHE-0722330"],"award-info":[{"award-number":["CHE-0722330"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["CHE-1214123"],"award-info":[{"award-number":["CHE-1214123"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100007234","name":"University of Chicago","doi-asserted-by":"publisher","award":["Yen Postdoctoral Fellowship"],"award-info":[{"award-number":["Yen Postdoctoral Fellowship"]}],"id":[{"id":"10.13039\/100007234","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2015,12,21]]},"abstract":"<jats:p>We report the first coherent excitation of intramolecular vibrational modes via the nonlinear interaction of a TeraHertz (THz) light field with molecular liquids. A terahertz-terahertz-Raman pulse sequence prepares the coherences with a broadband, high-energy, (sub)picosecond terahertz pulse, that are then measured in a terahertz Kerr effect spectrometer via phase-sensitive, heterodyne detection with an optical pulse. The spectrometer reported here has broader terahertz frequency coverage, and an increased sensitivity relative to previously reported terahertz Kerr effect experiments. Vibrational coherences are observed in liquid diiodomethane at 3.66 THz (122 cm\u22121), and in carbon tetrachloride at 6.50 THz (217 cm\u22121), in exact agreement with literature values of those intramolecular modes. This work opens the door to 2D spectroscopies, nonlinear in terahertz field, that can study the dynamics of condensed-phase molecular systems, as well as coherent control at terahertz frequencies.<\/jats:p>","DOI":"10.1063\/1.4938165","type":"journal-article","created":{"date-parts":[[2015,12,22]],"date-time":"2015-12-22T00:59:18Z","timestamp":1450745958000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":31,"title":["Nonlinear terahertz coherent excitation of vibrational modes of liquids"],"prefix":"10.1063","volume":"143","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3289-1659","authenticated-orcid":false,"given":"Marco A.","family":"Allodi","sequence":"first","affiliation":[{"name":"California Institute of Technology 1 Division of Chemistry and Chemical Engineering, , Pasadena, California 91125, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ian A.","family":"Finneran","sequence":"additional","affiliation":[{"name":"California Institute of Technology 1 Division of Chemistry and Chemical Engineering, , Pasadena, California 91125, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Geoffrey A.","family":"Blake","sequence":"additional","affiliation":[{"name":"California Institute of Technology 1 Division of Chemistry and Chemical Engineering, , Pasadena, California 91125, USA"},{"name":"California Institute of Technology 2 Division of Geological and Planetary Sciences, , Pasadena, California 91125, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2015,12,21]]},"reference":[{"key":"2023062609441160400_c1","doi-asserted-by":"publisher","first-page":"137404","DOI":"10.1103\/PhysRevLett.110.137404","article-title":"Observation of forbidden exciton transitions mediated by coulomb interactions in photoexcited semiconductor quantum wells","volume":"110","year":"2013","journal-title":"Phys. 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