The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform
Nancy Makri - One of the best experts on this subject based on the ideXlab platform.
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exciton Vibration Dynamics in j aggregates of a perylene bisimide from real time path integral calculations
Journal of Physical Chemistry C, 2021Co-Authors: Sohang Kundu, Nancy MakriAbstract:We use the modular path integral (MPI) and the small matrix path integral (SMatPI) methods to obtain numerically exact, fully quantum mechanical results for the excitation energy-transfer (EET) dyn...
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real time path integral simulation of exciton Vibration Dynamics in light harvesting bacteriochlorophyll aggregates
Journal of Physical Chemistry Letters, 2020Co-Authors: Sohang Kundu, Nancy MakriAbstract:The mechanism of excitation energy transfer in photoexcited bacteriochlorophyll (BChl) aggregates poses intriguing questions, which have important implications for the observed efficiency of photosynthesis. We investigate this process through fully quantum mechanical calculations of exciton-Vibration Dynamics in chains and rings of BChl a molecules, with parameters characterizing the B850 ring of the LH2 complex of photosynthetic bacteria. The calculations are performed using the modular path integral methodology, which allows the exact treatment of 50 intramolecular Vibrations on each pigment using parameters obtained from spectroscopic Huang-Rhys factors with computational effort that scales linearly with aggregate length. Our results indicate that the interplay between electronic and Vibrational time scales leads to the rapid suppression but not the overdamping of electronic coherence, which facilitates the spreading of excitation energy throughout the aggregate.
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All-Mode Quantum-Classical Path Integral Simulation of Bacteriochlorophyll Dimer Exciton-Vibration Dynamics
The journal of physical chemistry. B, 2020Co-Authors: Amartya Bose, Nancy MakriAbstract:We use the quantum–classical path integral (QCPI) methodology to report numerically exact, fully quantum mechanical results for the exciton-Vibration Dynamics in the bacteriochlorophyll dimer, incl...
Sohang Kundu - One of the best experts on this subject based on the ideXlab platform.
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exciton Vibration Dynamics in j aggregates of a perylene bisimide from real time path integral calculations
Journal of Physical Chemistry C, 2021Co-Authors: Sohang Kundu, Nancy MakriAbstract:We use the modular path integral (MPI) and the small matrix path integral (SMatPI) methods to obtain numerically exact, fully quantum mechanical results for the excitation energy-transfer (EET) dyn...
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real time path integral simulation of exciton Vibration Dynamics in light harvesting bacteriochlorophyll aggregates
Journal of Physical Chemistry Letters, 2020Co-Authors: Sohang Kundu, Nancy MakriAbstract:The mechanism of excitation energy transfer in photoexcited bacteriochlorophyll (BChl) aggregates poses intriguing questions, which have important implications for the observed efficiency of photosynthesis. We investigate this process through fully quantum mechanical calculations of exciton-Vibration Dynamics in chains and rings of BChl a molecules, with parameters characterizing the B850 ring of the LH2 complex of photosynthetic bacteria. The calculations are performed using the modular path integral methodology, which allows the exact treatment of 50 intramolecular Vibrations on each pigment using parameters obtained from spectroscopic Huang-Rhys factors with computational effort that scales linearly with aggregate length. Our results indicate that the interplay between electronic and Vibrational time scales leads to the rapid suppression but not the overdamping of electronic coherence, which facilitates the spreading of excitation energy throughout the aggregate.
Julia W. P. Hsu - One of the best experts on this subject based on the ideXlab platform.
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Vibration Dynamics of tapered optical fiber probes
Journal of Applied Physics, 1997Co-Authors: Ya-tang Yang, D. Heh, Pei-kuen Wei, Wunshain Fann, Matthew H. Gray, Julia W. P. HsuAbstract:[[abstract]]The motion of tapered fiber probes was studied both theoretically and experimentally. A continuum-mechanical model, including both the intrinsic and the external loss, is proposed to account for the Vibration Dynamics of the probe. The intrinsic loss was found to be the dominant damping factor experimentally. Analytical solutions based on a realistic probe geometry were obtained for the model in the presence of intrinsic loss. The results are compared with the measured overall motions of the tapered probe. The calculations agree well with the experimental results.[[fileno]]2030166010009[[department]]電機工程學
Monika Schonhoff - One of the best experts on this subject based on the ideXlab platform.
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the influence of a viscous fluid on the Vibration Dynamics of scanning near field optical microscopy fiber probes and atomic force microscopy cantilevers
Journal of Applied Physics, 1998Co-Authors: Stefan Kirstein, Michael Mertesdorf, Monika SchonhoffAbstract:The influence of a viscous fluid on the dynamic behavior of a vibrating scanning near-field optical microscopy fiber tip is investigated both theoretically and experimentally. A continuum mechanical description of a cylindric cantilever is used to calculate the resonance frequencies and the widths of the resonance bands. The linearized Naviers–Stokes equations are analytically solved and describe the interaction of the beam with the viscous fluid. The contribution of the liquid to the shift and the broadening of the resonance lines is summarized by two constants that can be derived from a master function and the kinetic Reynolds number. The theoretical values are compared with experimental data collected from an optical fiber which is used as a probe in a scanning near-field microscope. Agreement, with a relative error of less than 1%, is achieved. The theory is further developed for the application to atomic force microscopy cantilevers with a rectangular cross section. Experimental data taken from literature are in good agreement with the theory.
Ya-tang Yang - One of the best experts on this subject based on the ideXlab platform.
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Vibration Dynamics of tapered optical fiber probes
Journal of Applied Physics, 1997Co-Authors: Ya-tang Yang, D. Heh, Pei-kuen Wei, Wunshain Fann, Matthew H. Gray, Julia W. P. HsuAbstract:[[abstract]]The motion of tapered fiber probes was studied both theoretically and experimentally. A continuum-mechanical model, including both the intrinsic and the external loss, is proposed to account for the Vibration Dynamics of the probe. The intrinsic loss was found to be the dominant damping factor experimentally. Analytical solutions based on a realistic probe geometry were obtained for the model in the presence of intrinsic loss. The results are compared with the measured overall motions of the tapered probe. The calculations agree well with the experimental results.[[fileno]]2030166010009[[department]]電機工程學
