【學(xué)術(shù)報(bào)告】Vibronic?Couplings?in?Solar?Energy?Conversion?and?Environmental?Issues
日期：2024-05-24
閱讀：1458
主題：Vibronic?Couplings?in?Solar?Energy?Conversion?and?Environmental?Issues
報(bào)告人：饒毅，副教授，猶他州立大學(xué)化學(xué)與生物化學(xué)系
時(shí)間：2024年5月24日（周五）14:00
地點(diǎn)：徐名材報(bào)告廳（霞光樓200）
邀請(qǐng)人：嚴(yán)暢 副教授
個(gè)人簡(jiǎn)介
饒毅，副教授，終身職位，猶他州立大學(xué)化學(xué)與生物化學(xué)系。2003年博士畢業(yè)于中國(guó)科學(xué)院化學(xué)研究所。?2004年加入哥倫比亞大學(xué)化學(xué)系Eisenthal研究組進(jìn)行三年博士后研究工作。隨后以副研究員?(Associate?Research?Scientist)的身份與Nicholas?J.?Turro教授和Kenneth?B.?Eisenthal教授一起合作。2014年加入天普大學(xué)化學(xué)系以研究副教授?(Research?Associate?Professor)?的身份開(kāi)始獨(dú)立的研究工作。2017年在猶他州立大學(xué)化學(xué)與生物化學(xué)系以助理教授身份建立獨(dú)立的研究小組。2023年晉升為副教授并授予終身職位。研究興趣涉及超快光譜，表面科學(xué)，光化學(xué),?能源轉(zhuǎn)換，催化以及環(huán)境科學(xué)等諸多領(lǐng)域。以通訊聯(lián)系人在Nature?chemistry，?PNAS，?Communication?Chemistry,?ACS?Energy?Letter,?J.?Phys.?Chem.?Lett.,?J.?Phys.?Chem，?and?J.?Chem.?Phys.?等著名期刊上發(fā)表論文60余篇,?擁有美國(guó)專(zhuān)利5項(xiàng)。獲得美國(guó)自然科學(xué)基金早期職業(yè)獎(jiǎng)，美國(guó)化學(xué)會(huì)猶他分會(huì)杰出教育獎(jiǎng)，本田汽車(chē)材料研究所優(yōu)秀合作獎(jiǎng)，猶他州立大學(xué)科學(xué)學(xué)院年度研究獎(jiǎng)。
報(bào)告摘要
Interactions?of?electronic?and?vibrational?degrees?of?freedom,?namely?vibronic?couplings,?are?essential?for?understanding?excited?states?relaxation?pathways?of?molecular?systems?in?bulk?and?at?interfaces?and?surfaces.?In?this?talk,?I?will?give?two?examples?of?vibronic?couplings?applied?to?singlet?fission?and?interfacial?charge?transfer.?Part?I:?We?examined?the?role?of?vibronic?coupling?in?singlet?fission?using?polarized?transient?absorption?microscopy?for?solar?energy?conversion.?It?was?found?that?singlet?fission?in?pentacene?is?greatly?facilitated?by?the?vibrational?coherence?of?a?low?frequency?phonon,?which?anisotropic?coherence?persists?extensively?for?a?few?picoseconds.?This?coherence-preserving?phonon?that?drives?the?anisotropic?singlet-fission?is?made?possible?by?a?unique?cross-axial?charge?transfer?intermediate?state.?In?the?same?fashion,?this?phonon?was?also?found?to?predominantly?drive?the?quantum?decoherence?of?a?correlated?triplet?pair?to?form?a?decoupled?triplet?dimer.?Part?II:?I?will?present?the?development?of?interface-specific?two-dimensional?electronic-vibrational?sum?frequency?spectroscopy?(2D-EVSFG)?for?electronic-vibrational?couplings?for?excited?states?at?interfaces?and?surfaces?for?environmental?issues.?We?demonstrate?this?2D-EVSFG?technique?by?investigating?photoexcited?interface-active?molecules?at?the?air/water?interface?as?an?example.?Our?2D-EVSFG?experiments?show?strong?vibronic?couplings?of?interfacial?molecules?upon?photoexcitation?and?subsequent?relaxation?of?a?locally?excited?(LE)?state.?We?believe?that?this?development?of?2D-EVSFG?opens?up?a?new?avenue?of?understanding?excited?state?dynamics?related?to?interfaces?and?surfaces.
