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Bondarenko AS, Jansen TLC, Knoester J. Exciton localization in tubular molecular aggregates: Size effects and optical response. J Chem Phys 2020; 152:194302. [PMID: 33687267 DOI: 10.1063/5.0008688] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
We study the exciton localization and resulting optical response for disordered tubular aggregates of optically active molecules. It has previously been shown that such tubular structures allow for excitons delocalized over more than a thousand molecules, owing to the combined effects of long-range dipole-dipole interactions and the higher-dimensional (not truly one-dimensional) nature of the aggregate. Such large delocalization sizes prompt the question to what extent in experimental systems the delocalization may still be determined by the aggregate size (diameter and length) and how this affects the aggregate's optical response and dynamics. We perform a systematic study of the size effects on the localization properties using numerical simulations of the exciton states in a cylindrical model structure inspired by the previously derived geometry of a cylindrical aggregate of cyanine dye molecules (C8S3). To characterize the exciton localization, we calculate the participation ratio and the autocorrelation function of the exciton wave function. We also calculate the density of states and absorption spectrum. We find strong effects of the tube's radius on the localization and optical properties in the range of parameters relevant to the experiment. In addition, surprisingly, we find that even for tubes as long as 750 nm, the localization size is limited by the tube's length for disorder values that are relevant to experimental circumstances, while observable effects of the tube's length in the absorption spectrum still occur for tube lengths up to about 150 nm. The latter may explain the changes in the optical spectra observed during the aging process of bromine-substituted C8S3 aggregates. For weak disorder, the exciton wave functions exhibit a scattered, fractal-like nature, similar to the quasi-particles in two-dimensional disordered systems.
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Affiliation(s)
- Anna S Bondarenko
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Thomas L C Jansen
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Jasper Knoester
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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2
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Molesky BP, Guo Z, Moran AM. Femtosecond stimulated Raman spectroscopy by six-wave mixing. J Chem Phys 2015; 142:212405. [DOI: 10.1063/1.4914095] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Affiliation(s)
- Brian P. Molesky
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - Zhenkun Guo
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - Andrew M. Moran
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
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3
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Sun KW, Gelin MF, Chernyak VY, Zhao Y. Davydov Ansatz as an efficient tool for the simulation of nonlinear optical response of molecular aggregates. J Chem Phys 2015; 142:212448. [DOI: 10.1063/1.4921575] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Ke-Wei Sun
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, China
- Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Maxim F. Gelin
- Department of Chemistry, Technische Universität München, Garching D-85747, Germany
| | - Vladimir Y. Chernyak
- Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
| | - Yang Zhao
- Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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4
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Bloemsma EA, Vlaming SM, Malyshev VA, Knoester J. Signature of anomalous exciton localization in the optical response of self-assembled organic nanotubes. PHYSICAL REVIEW LETTERS 2015; 114:156804. [PMID: 25933330 DOI: 10.1103/physrevlett.114.156804] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Indexed: 05/03/2023]
Abstract
We show that the disorder scaling of the low-temperature optical absorption linewidth of tubular molecular assemblies sharply contrasts with that known for one-dimensional aggregates. The difference can be explained by an anomalous localization of excitons, which arises from the combination of long-range intermolecular interactions and the tube's higher-dimensional geometry. As a result, the exciton density of states near the band bottom drops to zero, leading to a strong suppression of exciton localization. Our results explain the strong linear dichroism and weak exciton-exciton scattering in tubular J aggregates observed in experiments and suggest that for nanoscale wirelike applications a tubular shape is to be preferred over a truly one-dimensional chain.
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Affiliation(s)
- E A Bloemsma
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - S M Vlaming
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - V A Malyshev
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - J Knoester
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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5
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Yuen-Zhou J, Arias DH, Eisele DM, Steiner CP, Krich JJ, Bawendi MG, Nelson KA, Aspuru-Guzik A. Coherent exciton dynamics in supramolecular light-harvesting nanotubes revealed by ultrafast quantum process tomography. ACS NANO 2014; 8:5527-34. [PMID: 24724614 DOI: 10.1021/nn406107q] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Long-lived exciton coherences have been recently observed in photosynthetic complexes via ultrafast spectroscopy, opening exciting possibilities for the study and design of coherent exciton transport. Yet, ambiguity in the spectroscopic signals has led to arguments against interpreting them in terms of exciton dynamics, demanding more stringent tests. We propose a novel strategy, quantum process tomography (QPT), for ultrafast spectroscopy and apply it to reconstruct the evolving quantum state of excitons in double-walled supramolecular light-harvesting nanotubes at room temperature from eight narrowband transient grating experiments. Our analysis reveals the absence of nonsecular processes, unidirectional energy transfer from the outer to the inner wall exciton states, and coherence between those states lasting about 150 fs, indicating weak electronic coupling between the walls. Our work constitutes the first experimental QPT in a "warm" and complex system and provides an elegant scheme to maximize information from ultrafast spectroscopy experiments.
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Affiliation(s)
- Joel Yuen-Zhou
- Center for Excitonics, Research Laboratory of Electronics, Massachusetts Institute of Technology , Cambridge, Massachusetts, United States
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6
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Huynh TD, Sun KW, Gelin M, Zhao Y. Polaron dynamics in two-dimensional photon-echo spectroscopy of molecular rings. J Chem Phys 2014; 139:104103. [PMID: 24050324 DOI: 10.1063/1.4820135] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have developed a new approach to the computation of third-order spectroscopic signals of molecular rings, by incorporating the Davydov soliton theory into the nonlinear response function formalism. The Davydov D1 and D Ansätze have been employed to treat the interactions between the excitons and the primary phonons, allowing for a full description of arbitrary exciton-phonon coupling strengths. As an illustration, we have simulated a series of optical 2D spectra for two models of molecular rings.
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Affiliation(s)
- Thanh Duc Huynh
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
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7
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Collini E, Bolzonello L, Zerbetto M, Ferrante C, Manfredi N, Abbotto A. Lifetime shortening and fast energy-tansfer processes upon dimerization of a A-π-D-π-A molecule. Chemphyschem 2014; 15:310-9. [PMID: 24265124 DOI: 10.1002/cphc.201300694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 10/21/2013] [Indexed: 11/10/2022]
Abstract
Time-resolved fluorescence and transient absorption experiments uncover a distinct change in the relaxation dynamics of the homo-dimer formed by two 2,5-bis[1-(4-N-methylpyridinium)ethen-2-yl)]-N-methylpyrrole ditriflate (M) units linked by a short alkyl chain when compared to that of the monomer M. Fluorescence decay traces reveal characteristic decay times of 1.1 ns and 210 ps for M and the dimer, respectively. Transient absorption spectra in the spectral range of 425-1050 nm display similar spectral features for both systems, but strongly differ in the characteristic relaxation times gathered from a global fit of the experimental data. To rationalize the data we propose that after excitation of the dimer the energy localizes on one M branch and then decays to a dark state, peculiar only of the dimer. This dark state relaxes to the ground state within 210 ps through non-radiative relaxation. The nature of the dark state is discussed in relation to different possible photophysical processes such as excimer formation and charge transfer between the two M units. Anisotropy decay traces of the probe-beam differential transmittance of M and the dimer fall on complete different time scales as well. The anisotropy decay for M is satisfactorily ascribed to rotational diffusion in DMSO, whereas for the dimer it occurs on a faster time scale and is likely caused by energy-transfer processes between the two monomer M units.
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Affiliation(s)
- Elisabetta Collini
- Dipartimento di Scienze Chimiche and UdR INSTM, Università di Padova, Via Marzolo 1, 35131 Padova (Italy)
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8
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Milota F, Prokhorenko VI, Mancal T, von Berlepsch H, Bixner O, Kauffmann HF, Hauer J. Vibronic and vibrational coherences in two-dimensional electronic spectra of supramolecular J-aggregates. J Phys Chem A 2013; 117:6007-14. [PMID: 23461650 PMCID: PMC3725611 DOI: 10.1021/jp3119605] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In J-aggregates of cyanine dyes, closely packed molecules form mesoscopic tubes with nanometer-diameter and micrometer-length. Their efficient energy transfer pathways make them suitable candidates for artificial light harvesting systems. This great potential calls for an in-depth spectroscopic analysis of the underlying energy deactivation network and coherence dynamics. We use two-dimensional electronic spectroscopy with sub-10 fs laser pulses in combination with two-dimensional decay-associated spectra analysis to describe the population flow within the aggregate. Based on the analysis of Fourier-transform amplitude maps, we distinguish between vibrational or vibronic coherence dynamics as the origin of pronounced oscillations in our two-dimensional electronic spectra.
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Affiliation(s)
- Franz Milota
- Photonics Institute, Vienna University of Technology, Gusshausstrasse 27, 1040 Vienna, Austria
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9
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Arias DH, Stone KW, Vlaming SM, Walker BJ, Bawendi MG, Silbey RJ, Bulović V, Nelson KA. Thermally-Limited Exciton Delocalization in Superradiant Molecular Aggregates. J Phys Chem B 2012. [DOI: 10.1021/jp3086717] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Dylan H. Arias
- Department
of Chemistry and Center for Excitonics and ‡Research Laboratory of Electronics
and Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,
United States
| | - Katherine W. Stone
- Department
of Chemistry and Center for Excitonics and ‡Research Laboratory of Electronics
and Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,
United States
| | - Sebastiaan M. Vlaming
- Department
of Chemistry and Center for Excitonics and ‡Research Laboratory of Electronics
and Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,
United States
| | - Brian J. Walker
- Department
of Chemistry and Center for Excitonics and ‡Research Laboratory of Electronics
and Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,
United States
| | - Moungi G. Bawendi
- Department
of Chemistry and Center for Excitonics and ‡Research Laboratory of Electronics
and Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,
United States
| | - Robert J. Silbey
- Department
of Chemistry and Center for Excitonics and ‡Research Laboratory of Electronics
and Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,
United States
| | - Vladimir Bulović
- Department
of Chemistry and Center for Excitonics and ‡Research Laboratory of Electronics
and Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,
United States
| | - Keith A. Nelson
- Department
of Chemistry and Center for Excitonics and ‡Research Laboratory of Electronics
and Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,
United States
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10
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11
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Utilizing redox-chemistry to elucidate the nature of exciton transitions in supramolecular dye nanotubes. Nat Chem 2012; 4:655-62. [PMID: 22824898 DOI: 10.1038/nchem.1380] [Citation(s) in RCA: 133] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Accepted: 05/08/2012] [Indexed: 01/18/2023]
Abstract
Supramolecular assemblies that interact with light have recently garnered much interest as well-defined nanoscale materials for electronic excitation energy collection and transport. However, to control such complex systems it is essential to understand how their various parts interact and whether these interactions result in coherently shared excited states (excitons) or in diffusive energy transport between them. Here, we address this by studying a model system consisting of two concentric cylindrical dye aggregates in a light-harvesting nanotube. Through selective chemistry we are able to unambiguously determine the supramolecular origin of the observed excitonic transitions. These results required the development of a new theoretical model of the supramolecular structure of the assembly. Our results demonstrate that the two cylinders of the nanotube have distinct spectral responses and are best described as two separate, weakly coupled excitonic systems. Understanding such interactions is critical to the control of energy transfer on a molecular scale, a goal in various applications ranging from artificial photosynthesis to molecular electronics.
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12
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Abramavicius D, Nemeth A, Milota F, Sperling J, Mukamel S, Kauffmann HF. Weak exciton scattering in molecular nanotubes revealed by double-quantum two-dimensional electronic spectroscopy. PHYSICAL REVIEW LETTERS 2012; 108:067401. [PMID: 22401120 PMCID: PMC3721760 DOI: 10.1103/physrevlett.108.067401] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Indexed: 05/03/2023]
Abstract
The two-exciton manifold of a double-wall cylindrical molecular aggregate is studied using a coherent third order optical technique. Experiments reveal the anharmonic character of the exciton bands. Atomistic simulations of the exciton-exciton scattering show that the excitons can be treated as weakly coupled hard-core bosons. The weak coupling stems from the extended exciton delocalization made possible by the nanotube geometry.
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Affiliation(s)
- Darius Abramavicius
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China
- Department of Theoretical Physics, Vilnius University, Saulėtekio al. 9-III, LT-10222 Vilnius, Lithuania
| | | | - Franz Milota
- Faculty of Physics, University of Vienna, 1090 Vienna, Austria
| | | | - Shaul Mukamel
- Department of Chemistry, University of California, Irvine, California 92697-2025, USA
| | - Harald F. Kauffmann
- Faculty of Physics, University of Vienna, 1090 Vienna, Austria
- Faculty of Physics, Vienna University of Technology, 1040 Vienna, Austria
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13
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Miller SA, West BA, Curtis AC, Papanikolas JM, Moran AM. Communication: Uncovering molecule-TiO2 interactions with nonlinear spectroscopy. J Chem Phys 2011; 135:081101. [DOI: 10.1063/1.3631339] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Affiliation(s)
- Stephen A. Miller
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - Brantley A. West
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - Anna C. Curtis
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - John M. Papanikolas
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - Andrew M. Moran
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
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14
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Yuen-Zhou J, Aspuru-Guzik A. Quantum process tomography of excitonic dimers from two-dimensional electronic spectroscopy. I. General theory and application to homodimers. J Chem Phys 2011; 134:134505. [PMID: 21476762 DOI: 10.1063/1.3569694] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Is it possible to infer the time evolving quantum state of a multichromophoric system from a sequence of two-dimensional electronic spectra (2D-ES) as a function of waiting time? Here we provide a positive answer for a tractable model system: a coupled dimer. After exhaustively enumerating the Liouville pathways associated to each peak in the 2D-ES, we argue that by judiciously combining the information from a series of experiments varying the polarization and frequency components of the pulses, detailed information at the amplitude level about the input and output quantum states at the waiting time can be obtained. This possibility yields a quantum process tomography (QPT) of the single-exciton manifold, which completely characterizes the open quantum system dynamics through the reconstruction of the process matrix. In this manuscript, we present the general theory as well as specific and numerical results for a homodimer, for which we prove that signals stemming from coherence to population transfer and vice versa vanish upon isotropic averaging, therefore, only allowing for a partial QPT in such case. However, this fact simplifies the spectra, and it follows that only two polarization controlled experiments (and no pulse-shaping requirements) suffice to yield the elements of the process matrix, which survive under isotropic averaging. Redundancies in the 2D-ES amplitudes allow for the angle between the two site transition dipole moments to be self-consistently obtained, hence simultaneously yielding structural and dynamical information of the dimer. Model calculations are presented, as well as an error analysis in terms of the angle between the dipoles and peak amplitude extraction. In the second article accompanying this study, we numerically exemplify the theory for heterodimers and carry out a detailed error analysis for such case. This investigation reveals an exciting quantum information processing (QIP) approach to spectroscopic experiments of excitonic systems, and hence, bridges an important gap between theoretical studies on excitation energy transfer from the QIP standpoint and experimental methods to study such systems in the chemical physics community.
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Affiliation(s)
- Joel Yuen-Zhou
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
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15
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Butkus V, Gelzinis A, Valkunas L. Quantum Coherence and Disorder-Specific Effects in Simulations of 2D Optical Spectra of One-Dimensional J-aggregates. J Phys Chem A 2011; 115:3876-85. [DOI: 10.1021/jp108291r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. Butkus
- Department of Theoretical Physics, Faculty of Physics of Vilnius University, Sauletekio Avenue 9, build. 3, LT-10222 Vilnius, Lithuania
| | - A. Gelzinis
- Department of Theoretical Physics, Faculty of Physics of Vilnius University, Sauletekio Avenue 9, build. 3, LT-10222 Vilnius, Lithuania
| | - L. Valkunas
- Department of Theoretical Physics, Faculty of Physics of Vilnius University, Sauletekio Avenue 9, build. 3, LT-10222 Vilnius, Lithuania
- Center for Physical Sciences and Technology, Savanoriu Avenue 231, LT-02300 Vilnius, Lithuania
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16
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King JT, Baiz CR, Kubarych KJ. Solvent-dependent spectral diffusion in a hydrogen bonded "vibrational aggregate". J Phys Chem A 2011; 114:10590-604. [PMID: 20831231 DOI: 10.1021/jp106142u] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Two-dimensional infrared spectroscopy (2DIR) is used to measure the viscosity-dependent spectral diffusion of a model vibrational probe, Mn(2)(CO)(10) (dimanganese decacarbonyl, DMDC), in a series of alcohols with time scales ranging from 2.67 ps in methanol to 5.33 ps in 1-hexanol. Alcohol-alkane solvent mixtures were found to produce indistinguishable linear IR spectra, while still demonstrating viscosity-dependent spectral diffusion. Using a vibrational exciton model to characterize the inhomogeneous energy landscape, several analogies emerge with multichromophoric electronic systems, such as J-aggregates and light-harvesting protein complexes. An excitonic, local vibrational mode Hamiltonian parametrized to reproduce the vibrational structure of DMDC serves as a starting point from which site energies (i.e., local carbonyl frequencies) are given Gaussian distributed disorder. The model gives excellent agreement with both the linear IR spectrum and the inhomogeneous widths extracted from 2DIR, indicating the system can be considered to be a "vibrational aggregate." This model naturally leads to exchange narrowing due to disorder-induced exciton localization, producing line widths consistent with our 1D and 2D measurements. Further, the diagonal disorder alone effectively reduces the molecular symmetry, leading to the appearance of Raman bands in the IR spectrum in accord with the measurements. Here, we show that the static inhomogeneity of the excitonic model with disorder successfully captures the essential details of the 1D spectrum while predicting the degree of IR activity of forbidden modes as well as the inhomogeneous widths and relative magnitudes of the transition moments.
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Affiliation(s)
- John T King
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, USA
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17
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Dynamics of quantum wave packets in complex molecules traced by 2D coherent electronic correlation spectroscopy. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.proche.2011.08.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Olaya-Castro A, Scholes GD. Energy transfer from Förster–Dexter theory to quantum coherent light-harvesting. INT REV PHYS CHEM 2011. [DOI: 10.1080/0144235x.2010.537060] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Womick JM, Miller SA, Moran AM. Toward the origin of exciton electronic structure in phycobiliproteins. J Chem Phys 2010; 133:024507. [PMID: 20632763 DOI: 10.1063/1.3457378] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Femtosecond laser spectroscopies are used to examine the electronic structures of two proteins found in the phycobilisome antenna of cyanobacteria, allophycocyanin (APC) and C-phycocyanin (CPC). The wave function composition involving the pairs of phycocyanobilin pigments (i.e., dimers) found in both proteins is the primary focus of this investigation. Despite their similar geometries, earlier experimental studies conducted in our laboratory and elsewhere observe clear signatures of exciton electronic structure in APC but not CPC. This issue is further investigated here using new experiments. Transient grating (TG) experiments employing broadband quasicontinuum probe pulses find a redshift in the signal spectrum of APC, which is almost twice that of CPC. Dynamics in the TG signal spectra suggest that the sub-100 fs dynamics in APC and CPC are respectively dominated by internal conversion and nuclear relaxation. A specialized technique, intraband electronic coherence spectroscopy (IECS), photoexcites electronic and nuclear coherences with nearly full suppression of signals corresponding to electronic populations. The main conclusion drawn by IECS is that dephasing of intraband electronic coherences in APC occurs in less than 25 fs. This result rules out correlated pigment fluctuations as the mechanism enabling exciton formation in APC and leads us to propose that the large Franck-Condon factors of APC promote wave function delocalization in the vibronic basis. For illustration, we compute the Hamiltonian matrix elements involving the electronic origin of the alpha84 pigment and the first excited vibronic level of the beta84 pigment associated with a hydrogen out-of-plane wagging mode at 800 cm(-1). For this pair of vibronic states, the -51 cm(-1) coupling is larger than the 40 cm(-1) energy gap, thereby making wave function delocalization a feasible prospect. By contrast, CPC possesses no pair of vibronic levels for which the intermolecular coupling is larger than the energy gap between vibronic states. This study of APC and CPC may be important for understanding the photophysics of other phycobiliproteins, which generally possess large vibronic couplings.
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Affiliation(s)
- Jordan M Womick
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
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20
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West BA, Womick JM, McNeil LE, Tan KJ, Moran AM. Influence of Vibronic Coupling on Band Structure and Exciton Self-Trapping in α-Perylene. J Phys Chem B 2010; 115:5157-67. [DOI: 10.1021/jp105115n] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
| | | | | | - Ke Jie Tan
- School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798
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21
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Sperling J, Nemeth A, Hauer J, Abramavicius D, Mukamel S, Kauffmann HF, Milota F. Excitons and Disorder in Molecular Nanotubes: A 2D Electronic Spectroscopy Study and First Comparison to a Microscopic Model. J Phys Chem A 2010; 114:8179-89. [DOI: 10.1021/jp102173n] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Jaroslaw Sperling
- Newport Spectra-Physics, Guerickeweg 7, 64291 Darmstadt, Germany, Electronic Properties of Materials, Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria, Department of Chemistry, 1102 Natural Sciences, University of California, Irvine, California 92697-2025, Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8 - 10, 1040 Vienna, Austria, and Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität, Oettingenstraβe 67,
| | - Alexandra Nemeth
- Newport Spectra-Physics, Guerickeweg 7, 64291 Darmstadt, Germany, Electronic Properties of Materials, Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria, Department of Chemistry, 1102 Natural Sciences, University of California, Irvine, California 92697-2025, Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8 - 10, 1040 Vienna, Austria, and Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität, Oettingenstraβe 67,
| | - Jürgen Hauer
- Newport Spectra-Physics, Guerickeweg 7, 64291 Darmstadt, Germany, Electronic Properties of Materials, Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria, Department of Chemistry, 1102 Natural Sciences, University of California, Irvine, California 92697-2025, Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8 - 10, 1040 Vienna, Austria, and Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität, Oettingenstraβe 67,
| | - Darius Abramavicius
- Newport Spectra-Physics, Guerickeweg 7, 64291 Darmstadt, Germany, Electronic Properties of Materials, Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria, Department of Chemistry, 1102 Natural Sciences, University of California, Irvine, California 92697-2025, Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8 - 10, 1040 Vienna, Austria, and Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität, Oettingenstraβe 67,
| | - Shaul Mukamel
- Newport Spectra-Physics, Guerickeweg 7, 64291 Darmstadt, Germany, Electronic Properties of Materials, Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria, Department of Chemistry, 1102 Natural Sciences, University of California, Irvine, California 92697-2025, Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8 - 10, 1040 Vienna, Austria, and Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität, Oettingenstraβe 67,
| | - Harald F. Kauffmann
- Newport Spectra-Physics, Guerickeweg 7, 64291 Darmstadt, Germany, Electronic Properties of Materials, Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria, Department of Chemistry, 1102 Natural Sciences, University of California, Irvine, California 92697-2025, Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8 - 10, 1040 Vienna, Austria, and Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität, Oettingenstraβe 67,
| | - Franz Milota
- Newport Spectra-Physics, Guerickeweg 7, 64291 Darmstadt, Germany, Electronic Properties of Materials, Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria, Department of Chemistry, 1102 Natural Sciences, University of California, Irvine, California 92697-2025, Ultrafast Dynamics Group, Faculty of Physics, Vienna University of Technology, Wiedner Hauptstrasse 8 - 10, 1040 Vienna, Austria, and Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität, Oettingenstraβe 67,
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Abramavicius D, Butkus V, Bujokas J, Valkunas L. Manipulation of two-dimensional spectra of excitonically coupled molecules by narrow-bandwidth laser pulses. Chem Phys 2010. [DOI: 10.1016/j.chemphys.2010.04.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Miller SA, Moran AM. Nonlinear Optical Detection of Electron Transfer Adiabaticity in Metal Polypyridyl Complexes. J Phys Chem A 2010; 114:2117-26. [DOI: 10.1021/jp9092145] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stephen A. Miller
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Andrew M. Moran
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
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Womick JM, Moran AM. Nature of Excited States and Relaxation Mechanisms in C-Phycocyanin. J Phys Chem B 2009; 113:15771-82. [DOI: 10.1021/jp908093x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Jordan M. Womick
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Andrew M. Moran
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
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25
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Womick JM, Moran AM. Exciton Coherence and Energy Transport in the Light-Harvesting Dimers of Allophycocyanin. J Phys Chem B 2009; 113:15747-59. [DOI: 10.1021/jp907644h] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jordan M. Womick
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Andrew M. Moran
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
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