1
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Lee C, Seo K, Kim M, Joo T. Coherent internal conversion from high lying electronic states to S 1 in boron-dipyrromethene derivatives. Phys Chem Chem Phys 2021; 23:25200-25209. [PMID: 34730576 DOI: 10.1039/d1cp03513d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Internal conversion is the first step after photoexcitation to high lying electronic states, and plays a central role in many photoinduced processes. In this report, we demonstrate a truly ultrafast internal conversion (IC) in large molecules by time-resolved fluorescence (TF). Following photoexcitation to the Sn (n ≥ 2) state, TF of the S1 state was recorded for two boron-dipyrromethene (BODIPY) derivatives in solution. IC to S1 takes place nearly instantaneously within 20 fs for both molecules. Abundant nuclear wave packet motions in the S1 state are manifest in the TF signals, which demonstrates that the IC in these BODIPY molecules is coherent with respect to most of the vibrational modes. Theoretical calculations assuming impulsive IC to S1 account for the wave packet dynamics accurately.
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Affiliation(s)
- Changmin Lee
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.
| | - Kiho Seo
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.
| | - Munnyon Kim
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.
| | - Taiha Joo
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.
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2
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Fiedor L, Dudkowiak A, Pilch M. The origin of the dark S 1 state in carotenoids: a comprehensive model. J R Soc Interface 2019; 16:20190191. [PMID: 31480924 DOI: 10.1098/rsif.2019.0191] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
In carotenoids, by analogy to polyenes, the symmetry of the π-electron system is often invoked to explain their peculiar electronic features, in particular the inactivity of the S0 → S1 transition in one-photon excitation. In this review, we verify whether the molecular symmetry of carotenoids and symmetry of their π-electron system are supported in experimental and computational studies. We focus on spectroscopic techniques which are sensitive to the electron density distribution, including the X-ray crystallography, electronic absorption, two-photon techniques, circular dichroism, nuclear magnetic resonance, Stark and vibrational spectroscopies, and on this basis we seek for the origin of inactivity of the S1 state. We come across no experimental and computational evidence for the symmetry effects and the existence of symmetry restrictions on the electronic states of carotenoids. They do not possess an inversion centre and the C2h symmetry approximation of carotenoid structure is by no means justified. In effect, the application of symmetry rules (and notification) to the electronic states of carotenoids in this symmetry group may lead to a wrong interpretation of experimental data. This conclusion together with the results summarized in the review allows us to advance a consistent model that explains the inactivity of the S0 → S1 transition. Within this model, S1 is never accessible from S0 due to the negative synergy of (i) the contributions of double excitations of very low probability, which elevate S1 energy, and (ii) a non-verticality of the S0 → S1 transition, due to the breaking of Born-Oppenheimer approximation. Certainly, our simple model requires a further experimental and theoretical verification.
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Affiliation(s)
- Leszek Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30387 Kraków, Poland
| | - Alina Dudkowiak
- Faculty of Technical Physics, Poznan University of Technology, Piotrowo 3, 60965 Poznan, Poland
| | - Mariusz Pilch
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30387 Kraków, Poland.,Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30387 Kraków, Poland
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3
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Musser AJ, Al-Hashimi M, Heeney M, Clark J. Heavy-atom effects on intramolecular singlet fission in a conjugated polymer. J Chem Phys 2019; 151:044902. [DOI: 10.1063/1.5110269] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
- Andrew J. Musser
- Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA
| | - Mohammed Al-Hashimi
- Department of Chemistry, Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar
| | - Martin Heeney
- Department of Chemistry and Centre for Plastic Electronics, Imperial College London, Exhibition Rd., London SW7 2AZ, United Kingdom
| | - Jenny Clark
- Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom
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4
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Demchenko AP, Tomin VI, Chou PT. Breaking the Kasha Rule for More Efficient Photochemistry. Chem Rev 2017; 117:13353-13381. [DOI: 10.1021/acs.chemrev.7b00110] [Citation(s) in RCA: 210] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Alexander P. Demchenko
- Palladin
Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovicha Street, Kyiv 01030, Ukraine
| | - Vladimir I. Tomin
- Institute
of Physics, Pomeranian University in Słupsk, ul. Arciszewskiego, 22b, Słupsk 76-200, Poland
| | - Pi-Tai Chou
- Department
of Chemistry, National Taiwan University, 1 Roosevelt Road Section 4, Taipei 106, Taiwan
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5
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Agarwal R, Chauvet AAP. Ultrafast dynamics of the photo-excited hemes b and c n in the cytochrome b 6f complex. Phys Chem Chem Phys 2017; 19:3287-3296. [PMID: 28085168 DOI: 10.1039/c6cp08077d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dynamics of hemes b and cn within the cytochrome b6f complex are investigated by means of ultrafast broad-band transient absorption spectroscopy. On the one hand, the data reveal that, subsequent to visible light excitation, part of the b hemes undergoes pulse-limited photo-oxidation, with the liberated electron supposedly being transferred to one of the adjacent aromatic amino acids. Photo-oxidation is followed by charge recombination in about 8.2 ps. Subsequent to charge recombination, heme b is promoted to a vibrationally excited ground state that relaxes in about 4.6 ps. On the other hand, heme cn undergoes ultrafast ground state recovery in about 140 fs. Interestingly, the data also show that, in contrast to previous beliefs, Chl a is involved in the photochemistry of hemes. Indeed, subsequent to heme excitation, Chl a bleaches and recovers to its ground state in 90 fs and 650 fs, respectively. Chl a bleaching allegedly corresponds to the formation of a short lived Chl a anion. Beyond the previously suggested structural role, this study provides unique evidence that Chl a is directly involved in the photochemistry of the hemes.
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Affiliation(s)
- Rachna Agarwal
- Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA and Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Adrien A P Chauvet
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide (LSU), ISIC, Faculté des Sciences de Base and Lausanne Centre for Ultrafast Science (LACUS), Station 6, 1015 Lausanne, Switzerland. and The University of Sheffield, Department of Chemistry, Dainton Building, Brook Hill, Sheffield S3 7HF, UK
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6
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Fiedor L, Fiedor J, Pilch M. Effects of Molecular Symmetry on the Electronic Transitions in Carotenoids. J Phys Chem Lett 2016; 7:1821-9. [PMID: 27138647 DOI: 10.1021/acs.jpclett.6b00637] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The aim of this work is the verification of symmetry effects on the electronic absorption spectra of carotenoids. The symmetry breaking in cis-β-carotenes and in carotenoids with nonlinear π-electron system is of virtually no effect on the dark transitions in these pigments, in spite of the loss of the inversion center and evident changes in their electronic structure. In the cis isomers, the S2 state couples with the higher excited states and the extent of this coupling depends on the position of the cis bend. A confrontation of symmetry properties of carotenoids with their electronic absorption and IR and Raman spectra shows that they belong to the C1 or C2 but not the C2h symmetry group, as commonly assumed. In these realistic symmetries all the electronic transitions are symmetry-allowed and the absence of some transitions, such as the dark S0 → S1 transition, must have another physical origin. Most likely it is a severe deformation of the carotenoid molecule in the S1 state, unachievable directly from the ground state, which means that the Franck-Condon factors for a vertical S0 → S1 transition are negligible because the final state is massively displaced along the vibrational coordinates. The implications of our findings have an impact on the understanding of the photophysics and functioning of carotenoids.
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Affiliation(s)
- Leszek Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University , Gronostajowa 7, 30-387 Kraków, Poland
| | - Joanna Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University , Gronostajowa 7, 30-387 Kraków, Poland
- Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology , Mickiewicza 30, 30-059 Kraków, Poland
| | - Mariusz Pilch
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University , Gronostajowa 7, 30-387 Kraków, Poland
- Faculty of Chemistry, Jagiellonian University , Ingardena 3, 30-060 Kraków, Poland
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7
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Shenai PM, Fernandez-Alberti S, Bricker WP, Tretiak S, Zhao Y. Internal Conversion and Vibrational Energy Redistribution in Chlorophyll A. J Phys Chem B 2015; 120:49-58. [DOI: 10.1021/acs.jpcb.5b09548] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Prathamesh M. Shenai
- Division
of Materials Science, Nanyang Technological University, Singapore, Singapore 639798
| | | | - William P. Bricker
- Department
of Energy, Environmental and Chemical Engineering, Washington University, Saint Louis, Missouri 63130, United States
| | - Sergei Tretiak
- Theoretical
Division, Center for Nonlinear Studies (CNLS), and Center for Integrated
Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Yang Zhao
- Division
of Materials Science, Nanyang Technological University, Singapore, Singapore 639798
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8
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Intramolecular Mechanisms for the Occurrence of Fluorescence from Upper Excited States of Aromatic Molecules and Linear Polyenes. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/978-3-319-24609-3_9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2023]
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9
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Ghosh S, Bishop MM, Roscioli JD, Mueller JJ, Shepherd NC, LaFountain AM, Frank HA, Beck WF. Femtosecond Heterodyne Transient-Grating Studies of Nonradiative Decay of the S2 (11Bu+) State of β-Carotene: Contributions from Dark Intermediates and Double-Quantum Coherences. J Phys Chem B 2015; 119:14905-24. [DOI: 10.1021/acs.jpcb.5b09405] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Soumen Ghosh
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
| | - Michael M. Bishop
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
| | - Jerome D. Roscioli
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
| | - Jenny Jo Mueller
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
| | - Nolan C. Shepherd
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
| | - Amy M. LaFountain
- Department
of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Harry A. Frank
- Department
of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Warren F. Beck
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824-1322, United States
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10
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Quick M, Kasper MA, Richter C, Mahrwald R, Dobryakov AL, Kovalenko SA, Ernsting NP. β-Carotene Revisited by Transient Absorption and Stimulated Raman Spectroscopy. Chemphyschem 2015; 16:3824-35. [DOI: 10.1002/cphc.201500586] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Indexed: 12/21/2022]
Affiliation(s)
- Martin Quick
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Marc-André Kasper
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Celin Richter
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Rainer Mahrwald
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Alexander L. Dobryakov
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Sergey A. Kovalenko
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Nikolaus P. Ernsting
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
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11
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Bricker WP, Shenai PM, Ghosh A, Liu Z, Enriquez MGM, Lambrev PH, Tan HS, Lo CS, Tretiak S, Fernandez-Alberti S, Zhao Y. Non-radiative relaxation of photoexcited chlorophylls: theoretical and experimental study. Sci Rep 2015; 5:13625. [PMID: 26346438 PMCID: PMC4561917 DOI: 10.1038/srep13625] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 07/31/2015] [Indexed: 11/10/2022] Open
Abstract
Nonradiative relaxation of high-energy excited states to the lowest excited state in chlorophylls marks the first step in the process of photosynthesis. We perform ultrafast transient absorption spectroscopy measurements, that reveal this internal conversion dynamics to be slightly slower in chlorophyll B than in chlorophyll A. Modeling this process with non-adiabatic excited state molecular dynamics simulations uncovers a critical role played by the different side groups in the two molecules in governing the intramolecular redistribution of excited state wavefunction, leading, in turn, to different time-scales. Even given smaller electron-vibrational couplings compared to common organic conjugated chromophores, these molecules are able to efficiently dissipate about 1 eV of electronic energy into heat on the timescale of around 200 fs. This is achieved via selective participation of specific atomic groups and complex global migration of the wavefunction from the outer to inner ring, which may have important implications for biological light-harvesting function.
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Affiliation(s)
- William P Bricker
- Department of Energy, Environmental and Chemical Engineering, Washington University, Saint Louis, Missouri 63130, USA
| | - Prathamesh M Shenai
- Division of Materials Science, Nanyang Technological University, Singapore 639798
| | - Avishek Ghosh
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Zhengtang Liu
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Miriam Grace M Enriquez
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Petar H Lambrev
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.,Biological Research Center, Hungarian Academy of Sciences, 6726 Szeged, Temesvari krt. 62, Hungary
| | - Howe-Siang Tan
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Cynthia S Lo
- Department of Energy, Environmental and Chemical Engineering, Washington University, Saint Louis, Missouri 63130, USA
| | - Sergei Tretiak
- Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | | | - Yang Zhao
- Division of Materials Science, Nanyang Technological University, Singapore 639798
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12
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Liebel M, Schnedermann C, Wende T, Kukura P. Principles and Applications of Broadband Impulsive Vibrational Spectroscopy. J Phys Chem A 2015; 119:9506-17. [DOI: 10.1021/acs.jpca.5b05948] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Liebel
- Physical and Theoretical
Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QZ Oxford, U.K
| | - C. Schnedermann
- Physical and Theoretical
Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QZ Oxford, U.K
| | - T. Wende
- Physical and Theoretical
Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QZ Oxford, U.K
| | - P. Kukura
- Physical and Theoretical
Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QZ Oxford, U.K
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13
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Kim SY, Joo T. Coherent Nuclear Wave Packets in Q States by Ultrafast Internal Conversions in Free Base Tetraphenylporphyrin. J Phys Chem Lett 2015; 6:2993-2998. [PMID: 26267193 DOI: 10.1021/acs.jpclett.5b01188] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Persistence of vibrational coherence in electronic transition has been noted especially in biochemical systems. Here, we report the dynamics between electronic excited states in free base tetraphenylporphyrin (H2TPP) by time-resolved fluorescence with high time resolution. Following the photoexcitation of the B state, ultrafast internal conversion occurs to the Qx state directly as well as via the Qy state. Unique and distinct coherent nuclear wave packet motions in the Qx and Qy states are observed through the modulation of the fluorescence intensity in time. The instant, serial internal conversions from the B to the Qy and Qx states generate the coherent wave packets. Theory and experiment show that the observed vibrational modes involve the out-of-plane vibrations of the porphyrin ring that are strongly coupled to the internal conversion of H2TPP.
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Affiliation(s)
- So Young Kim
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Taiha Joo
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
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14
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Takaya T, Iwata K. Relaxation mechanism of β-carotene from S2 (1Bu(+)) state to S1 (2Ag(-)) state: femtosecond time-resolved near-IR absorption and stimulated resonance Raman studies in 900-1550 nm region. J Phys Chem A 2014; 118:4071-8. [PMID: 24844607 DOI: 10.1021/jp504272h] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Carotenoids have two major low-lying excited states, the second lowest (S2 (1Bu(+))) and the lowest (S1 (2Ag(-))) excited singlet states, both of which are suggested to be involved in the energy transfer processes in light-harvesting complexes. Studying vibrational dynamics of S2 carotenoids requires ultrafast time-resolved near-IR Raman spectroscopy, although it has much less sensitivity than visible Raman spectroscopy. In this study, the relaxation mechanism of β-carotene from the S2 state to the S1 state is investigated by femtosecond time-resolved multiplex near-IR absorption and stimulated Raman spectroscopy. The energy gap between the S2 and S1 states is estimated to be 6780 cm(-1) from near-IR transient absorption spectra. The near-IR stimulated Raman spectrum of S2 β-carotene show three bands at 1580, 1240, and 1050 cm(-1). When excess energy of 4000 cm(-1) is added, the S1 C═C stretch band shows a large upshift with a time constant of 0.2 ps. The fast upshift is explained by a model that excess energy generated by internal conversion from the S2 state to the S1 state is selectively accepted by one of the vibronic levels of the S1 state and is redistributed among all the vibrational modes.
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Affiliation(s)
- Tomohisa Takaya
- Department of Chemistry, Faculty of Science, Gakushuin University , 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
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15
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Álvarez R, Vaz B, Gronemeyer H, de Lera ÁR. Functions, therapeutic applications, and synthesis of retinoids and carotenoids. Chem Rev 2013; 114:1-125. [PMID: 24266866 DOI: 10.1021/cr400126u] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Rosana Álvarez
- Departamento de Química Orgánica, Centro de Investigación Biomédica (CINBIO), and Instituto de Investigación Biomédica de Vigo (IBIV), Universidade de Vigo , 36310 Vigo, Spain
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16
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Marek MS, Buckup T, Southall J, Cogdell RJ, Motzkus M. Highlighting short-lived excited electronic states with pump-degenerate-four-wave-mixing. J Chem Phys 2013; 139:074202. [PMID: 23968082 DOI: 10.1063/1.4818164] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Marie S Marek
- Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany
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17
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Liebel M, Kukura P. Broad-Band Impulsive Vibrational Spectroscopy of Excited Electronic States in the Time Domain. J Phys Chem Lett 2013; 4:1358-64. [PMID: 26282153 DOI: 10.1021/jz4004203] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We demonstrate that transient absorption spectroscopy performed with an ultrashort pump pulse and a chirped, broad-band probe pulse is capable of recording full vibrational spectra of excited electronic states in the time domain. The resulting spectra do not suffer from the nontrivial baselines and line shapes often encountered in frequency domain techniques and enable optimal and automated subtraction of background signatures. Probing the molecular dynamics continuously over a broad energy bandwidth makes it possible to confidently assign the vibrational coherences to specific electronic states and suggests the existence of mode-specific absorption spectra reminiscent of resonance Raman intensity analysis. The first observation of the nominally forbidden one-photon ground to first excited electronic state transition in β-carotene demonstrates the high sensitivity of our approach. Our results provide a first glimpse of the immense potential of broad-band impulsive vibrational spectroscopy (BB-IVS) to study ultrafast chemical reaction dynamics.
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Affiliation(s)
- Matz Liebel
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Philipp Kukura
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
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18
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Krawczyk S, Luchowski R. Vibronic structure and coupling of higher excited electronic states in carotenoids. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.02.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Vdović S, Wang Y, Li B, Qiu M, Wang X, Guo Q, Xia A. Excited state dynamics of β-carotene studied by means of transient absorption spectroscopy and multivariate curve resolution alternating least-squares analysis. Phys Chem Chem Phys 2013; 15:20026-36. [DOI: 10.1039/c3cp53323a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Itoh T. Fluorescence and phosphorescence from higher excited states of organic molecules. Chem Rev 2012; 112:4541-68. [PMID: 22591067 DOI: 10.1021/cr200166m] [Citation(s) in RCA: 226] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takao Itoh
- Graduate School of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima City, 739-8521 Japan.
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21
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Photoisomerization around a Fulvene Double Bond: Coherent Population Transfer to the Electronic Ground State? Chemphyschem 2011; 12:1860-71. [DOI: 10.1002/cphc.201001082] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Revised: 04/20/2011] [Indexed: 11/07/2022]
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22
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Golibrzuch K, Ehlers F, Scholz M, Oswald R, Lenzer T, Oum K, Kim H, Koo S. Ultrafast excited state dynamics and spectroscopy of 13,13'-diphenyl-β-carotene. Phys Chem Chem Phys 2011; 13:6340-51. [PMID: 21365078 DOI: 10.1039/c0cp02525a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ultrafast transient broadband absorption spectroscopy based on the Pump-Supercontinuum Probe (PSCP) technique has been applied to characterize the excited state dynamics of the newly-synthesized artificial β-carotene derivative 13,13'-diphenyl-β-carotene in the wavelength range 340-770 nm with ca. 60 fs cross-correlation time after excitation to the S(2) state. The influence of phenyl substitution at the polyene backbone has been investigated in different solvents by comparing the dynamics of the internal conversion (IC) processes S(2)→ S(1) and S(1)→ S(0)* with results for β-carotene. Global analysis provides IC time constants and also time-dependent S(1) spectra demonstrating vibrational relaxation processes. Intramolecular vibrational redistribution processes are accelerated by phenyl substitution and are also solvent-dependent. DFT and TDDFT-TDA calculations suggest that both phenyl rings prefer an orientation where their ring planes are almost perpendicular to the plane of the carotene backbone, largely decoupling them electronically from the polyene system. This is consistent with several experimental observations: the up-field chemical shift of adjacent hydrogen atoms by a ring-current effect of the phenyl groups in the (1)H NMR spectrum, a small red-shift of the S(0)→ S(2)(0-0) transition energy in the steady-state absorption spectrum relative to β-carotene, and almost the same S(1)→ S(0)* IC time constant as in β-carotene, suggesting a similar S(1)-S(0) energy gap. The oscillator strength of the S(0)→ S(2) transition of the diphenyl derivative is reduced by ca. 20%. In addition, we observe a highly structured ground state bleach combined with excited state absorption at longer wavelengths, which is typical for an "S* state". Both features can be clearly assigned to absorption of vibrationally hot molecules in the ground electronic state S(0)* superimposed on the bleach of room temperature molecules S(0). The S(0)* population is formed by IC from S(1). These findings are discussed in detail with respect to alternative interpretations previously reported in the literature. Understanding the dynamics of this type of artificial phenyl-substituted carotene systems appears useful regarding their future structural optimization with respect to enhanced thermal stability while keeping the desired photophysical properties.
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Affiliation(s)
- Kai Golibrzuch
- Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Göttingen, Germany
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Christensson N, Milota F, Nemeth A, Pugliesi I, Riedle E, Sperling J, Pullerits T, Kauffmann HF, Hauer J. Electronic Double-Quantum Coherences and Their Impact on Ultrafast Spectroscopy: The Example of β-Carotene. J Phys Chem Lett 2010; 1:3366-3370. [PMID: 23828724 PMCID: PMC3698132 DOI: 10.1021/jz101409r] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Accepted: 11/09/2010] [Indexed: 05/06/2023]
Abstract
The energy level structure and dynamics of biomolecules are important for understanding their photoinduced function. In particular, the role of carotenoids in light-harvesting is heavily studied, yet not fully understood. The conventional approach to investigate these processes involves analysis of the third-order optical polarization in one spectral dimension. Here, we record two-dimensional correlation spectra for different time-orderings to characterize all components of the transient molecular polarization and the optical signal. Single- and double-quantum two-dimensional experiments provide insight into the energy level structure as well as the ultrafast dynamics of solvated β-carotene. By analysis of the lineshapes, we obtain the transition energy and characterize the potential energy surfaces of the involved states. We obtain direct experimental proof for an excited state absorption transition in the visible (S2→Sn2). The signatures of this transition in pump-probe transients are shown to lead to strongly damped oscillations with characteristic pump and probe frequency dependence.
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Affiliation(s)
- Niklas Christensson
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria
| | - Franz Milota
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria
- Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-University, Oettingenstrasse 67, 80538 Munich, Germany
| | - Alexandra Nemeth
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria
| | - Igor Pugliesi
- Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-University, Oettingenstrasse 67, 80538 Munich, Germany
| | - Eberhard Riedle
- Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-University, Oettingenstrasse 67, 80538 Munich, Germany
| | - Jaroslaw Sperling
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria
| | - Tõnu Pullerits
- Department of Chemical Physics, Lund University, Box 124, 21000, Lund, Sweden
| | - Harald F. Kauffmann
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria
- Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8 - 10, 1040 Vienna, Austria
| | - Jürgen Hauer
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria
- To whom correspondence should be addressed. E-mail:
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Dobryakov AL, Kovalenko SA, Weigel A, Pérez-Lustres JL, Lange J, Müller A, Ernsting NP. Femtosecond pump/supercontinuum-probe spectroscopy: optimized setup and signal analysis for single-shot spectral referencing. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:113106. [PMID: 21133460 DOI: 10.1063/1.3492897] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A setup for pump/supercontinuum-probe spectroscopy is described which (i) is optimized to cancel fluctuations of the probe light by single-shot referencing, and (ii) extends the probe range into the near-uv (1000-270 nm). Reflective optics allow 50 μm spot size in the sample and upon entry into two separate spectrographs. The correlation γ(same) between sample and reference readings of probe light level at every pixel exceeds 0.99, compared to γ(consec)<0.92 reported for consecutive referencing. Statistical analysis provides the confidence interval of the induced optical density, ΔOD. For demonstration we first examine a dye (Hoechst 33258) bound in the minor groove of double-stranded DNA. A weak 1.1 ps spectral oscillation in the fluorescence region, assigned to DNA breathing, is shown to be significant. A second example concerns the weak vibrational structure around t=0 which reflects stimulated Raman processes. With 1% fluctuations of probe power, baseline noise for a transient absorption spectrum becomes 25 μOD rms in 1 s at 1 kHz, allowing to record resonance Raman spectra of flavine adenine dinucleotide in the S(0) and S(1) state.
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Affiliation(s)
- A L Dobryakov
- Department of Chemistry, Humboldt University, Brook-Taylor-Str. 2, D-12489 Berlin, Germany
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Montero R, Conde ÁP, Longarte A, Castaño F. Coherent Excitation and Relaxation of the Coupled S1/S2 Electronic States of Naphthalene. Chemphyschem 2010; 11:3420-3. [DOI: 10.1002/cphc.201000718] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Namboodiri V, Namboodiri M, Flachenecker G, Materny A. Two-photon resonances in femtosecond time-resolved four-wave mixing spectroscopy: β-carotene. J Chem Phys 2010; 133:054503. [DOI: 10.1063/1.3466750] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kosumi D, Abe K, Karasawa H, Fujiwara M, Cogdell RJ, Hashimoto H, Yoshizawa M. Ultrafast relaxation kinetics of the dark S1 state in all-trans-β-carotene explored by one- and two-photon pump–probe spectroscopy. Chem Phys 2010. [DOI: 10.1016/j.chemphys.2009.12.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Excited-state dynamics of overlapped optically-allowed 1B(u) and optically-forbidden 1B(u) or 3A(g) vibronic levels of carotenoids: possible roles in the light-harvesting function. Int J Mol Sci 2010; 11:1888-929. [PMID: 20480049 PMCID: PMC2871145 DOI: 10.3390/ijms11041888] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2010] [Revised: 03/16/2010] [Accepted: 03/21/2010] [Indexed: 11/16/2022] Open
Abstract
The unique excited-state properties of the overlapped (diabatic) optically-allowed 1B(u) (+) and the optically-forbidden 1B(u) (-) or 3A(g) (-) vibronic levels close to conical intersection ('the diabatic pair') are summarized: Pump-probe spectroscopy after selective excitation with approximately 100 fs pulses of all-trans carotenoids (Cars) in nonpolar solvent identified a symmetry selection rule in the diabatic electronic mixing and diabatic internal conversion, i.e., '1B(u) (+)-to-1B(u) (-) is allowed but 1B(u) (+)-to-3A(g) (-) is forbidden'. On the other hand, pump-probe spectroscopy after coherent excitation with approximately 30 fs of all-trans Cars in THF generated stimulated emission with quantum beat, consisting of the long-lived coherent diabatic cross term and a pair of short-lived incoherent terms.
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Peralta Conde A, Montero R, Longarte A, Castaño F. Coherent excitation phenomena in time-resolved experiments. Phys Chem Chem Phys 2010; 12:15501-4. [DOI: 10.1039/c0cp00805b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lenzer T, Ehlers F, Scholz M, Oswald R, Oum K. Assignment of carotene S* state features to the vibrationally hot ground electronic state. Phys Chem Chem Phys 2010; 12:8832-9. [DOI: 10.1039/b925071a] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Christensson N, Milota F, Nemeth A, Sperling J, Kauffmann HF, Pullerits T, Hauer J. Two-Dimensional Electronic Spectroscopy of β-Carotene. J Phys Chem B 2009; 113:16409-19. [DOI: 10.1021/jp906604j] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Niklas Christensson
- Department of Chemical Physics, Lund University, Box 124, SE-21000, Lund, Sweden, Department of Physical Chemistry, University of Vienna, Währingerstr. 42, A-1090 Vienna, Austria, and Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
| | - Franz Milota
- Department of Chemical Physics, Lund University, Box 124, SE-21000, Lund, Sweden, Department of Physical Chemistry, University of Vienna, Währingerstr. 42, A-1090 Vienna, Austria, and Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
| | - Alexandra Nemeth
- Department of Chemical Physics, Lund University, Box 124, SE-21000, Lund, Sweden, Department of Physical Chemistry, University of Vienna, Währingerstr. 42, A-1090 Vienna, Austria, and Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
| | - Jaroslaw Sperling
- Department of Chemical Physics, Lund University, Box 124, SE-21000, Lund, Sweden, Department of Physical Chemistry, University of Vienna, Währingerstr. 42, A-1090 Vienna, Austria, and Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
| | - Harald F. Kauffmann
- Department of Chemical Physics, Lund University, Box 124, SE-21000, Lund, Sweden, Department of Physical Chemistry, University of Vienna, Währingerstr. 42, A-1090 Vienna, Austria, and Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
| | - Tönu Pullerits
- Department of Chemical Physics, Lund University, Box 124, SE-21000, Lund, Sweden, Department of Physical Chemistry, University of Vienna, Währingerstr. 42, A-1090 Vienna, Austria, and Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
| | - Jürgen Hauer
- Department of Chemical Physics, Lund University, Box 124, SE-21000, Lund, Sweden, Department of Physical Chemistry, University of Vienna, Währingerstr. 42, A-1090 Vienna, Austria, and Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
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Ostroumov E, Müller MG, Marian CM, Kleinschmidt M, Holzwarth AR. Electronic coherence provides a direct proof for energy-level crossing in photoexcited lutein and beta-carotene. PHYSICAL REVIEW LETTERS 2009; 103:108302. [PMID: 19792347 DOI: 10.1103/physrevlett.103.108302] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2009] [Indexed: 05/28/2023]
Abstract
We investigate femtosecond transient absorption dynamics of lutein and beta-carotene. Strong oscillations up to about 400 fs are observed, depending on excitation or detection wavelength and solvent. We propose electronic quantum beats as the origin of these oscillations. They provide direct proof for strong coupling of the 1B(u)(+) with another electronic "dark" state predicted by quantum chemical calculations to be the 1B(u)(-) state resulting in a crossing within a dynamic relaxation model. The overall dynamics can be described well by an optical Bloch equation approach.
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Affiliation(s)
- Evgeny Ostroumov
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
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Kosumi D, Fujiwara M, Fujii R, Cogdell RJ, Hashimoto H, Yoshizawa M. The dependence of the ultrafast relaxation kinetics of the S2 and S1 states in β-carotene homologs and lycopene on conjugation length studied by femtosecond time-resolved absorption and Kerr-gate fluorescence spectroscopies. J Chem Phys 2009; 130:214506. [DOI: 10.1063/1.3147008] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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36
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Femtosecond pump-supercontinuum probe and transient lens spectroscopy of adonixanthin. Arch Biochem Biophys 2009; 483:213-8. [DOI: 10.1016/j.abb.2008.11.026] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2008] [Revised: 11/21/2008] [Accepted: 11/27/2008] [Indexed: 11/20/2022]
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37
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Dobryakov AL, Ernsting NP. Lineshapes for resonant impulsive stimulated Raman scattering with chirped pump and supercontinuum probe pulses. J Chem Phys 2009; 129:184504. [PMID: 19045411 DOI: 10.1063/1.3009221] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Molecular vibrational coherence from impulsive stimulated Raman (SR) scattering, as observed by broadband transient absorption spectroscopy, is treated within the well-known third-order perturbation formalism. Shaped femtosecond optical pulses are used for the pump and supercontinuum probe fields. Dephasing is assumed to be homogeneous in the Bloch approximation. A key step requires threefold time integration over response functions and electric fields. For well-separated pulses the triple integral can be solved analytically, resulting in lineshape functions. These allow to describe the SR signal through absorption/emission/dispersion profiles which are associated with the inherent contributions. A clear physical interpretation of the amplitude and phase of the oscillatory signal is thereby obtained, and a direct connection with the vibronic structure of the molecular system is provided. Calculations for model molecular systems illustrate the spectral dependence of the vibrational coherence seen, for example, with perylene in cyclohexane. The nonoscillatory and oscillatory parts of the transient absorption spectra are compared to each other. Observed mode beatings are explained.
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Affiliation(s)
- A L Dobryakov
- Department of Chemistry, Humboldt University, D-12489 Berlin, Germany.
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38
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Carotenoid deactivation in an artificial light-harvesting complex via a vibrationally hot ground state. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2009.01.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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39
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Ehlers F, Lenzer T, Oum K. Excited-State Dynamics of 12′-Apo-β-caroten-12′-al and 8′-Apo-β-caroten-8′-al in Supercritical CO2, N2O, and CF3H. J Phys Chem B 2008; 112:16690-700. [DOI: 10.1021/jp807086n] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Florian Ehlers
- Max-Planck-Institut für biophysikalische Chemie, Abt. Spektroskopie und Photochemische Kinetik (10100), Am Fassberg 11, 37077 Göttingen, Germany, and Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany
| | - Thomas Lenzer
- Max-Planck-Institut für biophysikalische Chemie, Abt. Spektroskopie und Photochemische Kinetik (10100), Am Fassberg 11, 37077 Göttingen, Germany, and Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany
| | - Kawon Oum
- Max-Planck-Institut für biophysikalische Chemie, Abt. Spektroskopie und Photochemische Kinetik (10100), Am Fassberg 11, 37077 Göttingen, Germany, and Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany
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Farrow DA, Smith ER, Qian W, Jonas DM. The polarization anisotropy of vibrational quantum beats in resonant pump-probe experiments: Diagrammatic calculations for square symmetric molecules. J Chem Phys 2008; 129:174509. [DOI: 10.1063/1.2982160] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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41
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Weigel A, Dobryakov AL, Veiga M, Pérez Lustres JL. Photoinduced Processes in Riboflavin: Superposition of ππ*−nπ* States by Vibronic Coupling, Transfer of Vibrational Coherence, and Population Dynamics under Solvent Control. J Phys Chem A 2008; 112:12054-65. [DOI: 10.1021/jp805962u] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexander Weigel
- Institut für Chemie, Humboldt Universität zu Berlin, Brook Taylor Str. 2, 12489 Berlin, Germany
| | - Alexander L. Dobryakov
- Institut für Chemie, Humboldt Universität zu Berlin, Brook Taylor Str. 2, 12489 Berlin, Germany
| | - Manoel Veiga
- Institut für Chemie, Humboldt Universität zu Berlin, Brook Taylor Str. 2, 12489 Berlin, Germany
| | - J. Luis Pérez Lustres
- Institut für Chemie, Humboldt Universität zu Berlin, Brook Taylor Str. 2, 12489 Berlin, Germany
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42
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Polli D, Antognazza M, Brida D, Lanzani G, Cerullo G, De Silvestri S. Broadband pump-probe spectroscopy with sub-10-fs resolution for probing ultrafast internal conversion and coherent phonons in carotenoids. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2007.12.021] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Controlling the efficiency of an artificial light-harvesting complex. Proc Natl Acad Sci U S A 2008; 105:7641-6. [PMID: 18509052 DOI: 10.1073/pnas.0711927105] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Adaptive femtosecond pulse shaping in an evolutionary learning loop is applied to a bioinspired dyad molecule that closely mimics the early-time photophysics of the light-harvesting complex 2 (LH2) photosynthetic antenna complex. Control over the branching ratio between the two competing pathways for energy flow, internal conversion (IC) and energy transfer (ET), is realized. We show that by pulse shaping it is possible to increase independently the relative yield of both channels, ET and IC. The optimization results are analyzed by using Fourier analysis, which gives direct insight to the mechanism featuring quantum interference of a low-frequency mode. The results from the closed-loop experiments are repeatable and robust and demonstrate the power of coherent control experiments as a spectroscopic tool (i.e., quantum-control spectroscopy) capable of revealing functionally relevant molecular properties that are hidden from conventional techniques.
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Brüggemann B, Persson P, Meyer HD, May V. Frequency dispersed transient absorption spectra of dissolved perylene: A case study using the density matrix version of the MCTDH method. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2007.11.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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45
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Dobryakov A, Pérez Lustres J, Kovalenko S, Ernsting N. Femtosecond transient absorption with chirped pump and supercontinuum probe: Perturbative calculation of transient spectra with general lineshape functions, and simplifications. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2007.11.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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46
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Stalke S, Wild DA, Lenzer T, Kopczynski M, Lohse PW, Oum K. Solvent-dependent ultrafast internal conversion dynamics of n′-apo-β-carotenoic-n′-acids (n = 8, 10, 12). Phys Chem Chem Phys 2008; 10:2180-8. [DOI: 10.1039/b720037d] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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