{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T23:19:50Z","timestamp":1784848790860,"version":"3.55.0"},"reference-count":40,"publisher":"AIP Publishing","issue":"6","funder":[{"DOI":"10.13039\/501100010446","name":"Institute for Basic Science","doi-asserted-by":"publisher","award":["IBS-R023-D1"],"award-info":[{"award-number":["IBS-R023-D1"]}],"id":[{"id":"10.13039\/501100010446","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2022,2,14]]},"abstract":"<jats:p>We carried out transient absorption spectroscopy of thioflavin T (ThT) molecules in various solvents employing an asynchronous optical sampling (ASOPS) scheme with dual synchronized and frequency up-converted mode-lock lasers in the near UV (NUV) spectral region. We developed a pair of synchronized femtosecond lasers with tunable center wavelengths ranging from 380 to 430\u00a0nm and spectral bandwidths of 30\u00a0nm. As a proof-of-principle experiment, we measured interferometrically detected time and frequency-resolved pump\u2013probe signals of ThT in various solvents to study the twisted intramolecular charge transfer process of photo-excited ThT molecules. Both single-color NUV-NUV and two-color NUV-near IR (NIR) pump\u2013probe measurements reveal that the vibronic coupling strengths of two vibrational modes with frequencies of 214 and 526\u00a0cm\u22121 in the excited state of ThT are reduced when ThT is dissolved in a chlorine-containing solvent, e.g., chloroform. We confirm theoretically that these vibrational modes have relatively high electric dipole moments in the excited state. As a result, the intramolecular charge transfer process of ThT in chloroform, which is driven by the solvation process of surrounding polar solvent molecules, could occur less efficiently, which results in an increase in the fluorescence quantum yield. Here, we demonstrate that the NUV-NUV and NUV-NIR ASOPS-transient absorption could be useful techniques for studying ultrafast photochemical reactions in condensed phases.<\/jats:p>","DOI":"10.1063\/5.0077756","type":"journal-article","created":{"date-parts":[[2022,1,28]],"date-time":"2022-01-28T19:03:16Z","timestamp":1643396596000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":8,"title":["Time-resolved spectroscopy of thioflavin T solutions: Asynchronous optical sampling method with two frequency-upconverted mode-locked lasers"],"prefix":"10.1063","volume":"156","author":[{"given":"Noh Soo","family":"Han","sequence":"first","affiliation":[{"name":"Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS) 1 , Seoul 02841, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"JunWoo","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Princeton University 2 , Princeton, New Jersey 08544, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2408-9295","authenticated-orcid":false,"given":"Tai Hyun","family":"Yoon","sequence":"additional","affiliation":[{"name":"Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS) 1 , Seoul 02841, Republic of Korea"},{"name":"Department of Physics, Korea University 3 , Seoul 02841, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1618-1056","authenticated-orcid":false,"given":"Minhaeng","family":"Cho","sequence":"additional","affiliation":[{"name":"Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS) 1 , Seoul 02841, Republic of Korea"},{"name":"Department of Chemistry, Korea University 4 , Seoul 02841, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2022,2,11]]},"reference":[{"key":"2023081000323648100_c1","doi-asserted-by":"publisher","first-page":"54","DOI":"10.1126\/science.275.5296.54","volume":"275","year":"1997","journal-title":"Science"},{"key":"2023081000323648100_c2","doi-asserted-by":"publisher","first-page":"801","DOI":"10.1021\/ar500358q","volume":"48","year":"2015","journal-title":"Acc. 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