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Journal articles on the topic 'Exciton diffusion coefficient'

Author: Grafiati

Published: 2 November 2024

Last updated: 31 July 2025

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1

Sotome, Hikaru. "(Invited) Comprehensive Analysis of Exciton Diffusion with Time-Resolved Fluorescence Spectroscopy, Anisotropy and Imaging." ECS Meeting Abstracts MA2024-01, no. 13 (2024): 1065. http://dx.doi.org/10.1149/ma2024-01131065mtgabs.

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Excitons produced in materials play a crucial role in photo-energy conversion such as photovoltaics and electroluminescence devices. The temporal and spatial diffusion of excitons is a key factor for dominating the fundamental performance of optoelectronic materials. In this context, analysis of the exciton diffusion dynamics is an important issue for obtaining the rational design of the materials. Excitons diffusing in materials can be characterized by several parameters such as the energy level, orientation of the transition dipole moment and spatial distribution, and the detection of these

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2

Glazov, M. M., Z. A. Iakovlev, and S. Refaely-Abramson. "Phonon-induced exciton weak localization in two-dimensional semiconductors." Applied Physics Letters 121, no. 19 (2022): 192106. http://dx.doi.org/10.1063/5.0122633.

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We theoretically study the contribution of quantum effects to the exciton diffusion coefficient in atomically thin crystals. It is related to the weak localization caused by the interference of excitonic wavefunctions on the trajectories with closed loops. Due to the weak inelasticity of the exciton–phonon interaction, the effect is present even if the excitons are scattered by long-wavelength acoustic phonons. We consider exciton interaction with longitudinal acoustic phonons with linear dispersion and flexural phonons with quadratic dispersion. We identify the regimes where the weak localiza

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3

Ortiz, Angy L., Graham S. Collier, Dawn M. Marin, et al. "The effects of heavy atoms on the exciton diffusion properties in photoactive thin films of tetrakis(4-carbomethoxyphenyl)porphyrins." Journal of Materials Chemistry C 3, no. 6 (2015): 1243–49. http://dx.doi.org/10.1039/c4tc02232g.

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The exciton diffusion coefficient (D) and exciton diffusion length (L<sub>D</sub>) for three tetrakis(4-carbomethoxyphenyl)porphyrins were obtained by fitting the quenching efficiency and PL lifetime to a 3D exciton Monte Carlo ediffusion model.

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Shibu, Abhishek, Camilla Middleton, Carly O. Kwiatkowski, Meesha Kaushal, Jonathan H. Gillen, and Michael G. Walter. "Self-Assembly-Directed Exciton Diffusion in Solution-Processable Metalloporphyrin Thin Films." Molecules 27, no. 1 (2021): 35. http://dx.doi.org/10.3390/molecules27010035.

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The study of excited-state energy diffusion has had an important impact in the development and optimization of organic electronics. For instance, optimizing excited-state energy migration in the photoactive layer in an organic solar cell device has been shown to yield efficient solar energy conversion. Despite the crucial role that energy migration plays in molecular electronic device physics, there is still a great deal to be explored to establish how molecular orientation impacts energy diffusion mechanisms. In this work, we have synthesized a new library of solution-processable, Zn (alkoxyc

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5

Fugol’, I. Ya, A. G. Belov, E. M. Yurtaeva, and V. N. Svishchev. "Exciton-stimulated diffusion of xenon impurity in krypton cryocrystals." Soviet Journal of Low Temperature Physics 13, no. 3 (1987): 163–67. https://doi.org/10.1063/10.0031668.

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The intensity distribution of intrinsic and extrinsic luminescence as a function of the duration of irradiation by low-energy electrons was studied in xenon-krypton solid solutions. Low-temperature accelerated diffusion of xenon impurity atoms was observed at low concentrations. It is shown that this diffusion is stimulated by free excitons of the matrix, and a possible mechanism for this process is proposed. The restructuring of the structure of the solution is described qualitatively based on a model of the transport of excitations in the matrix. The coefficient of exciton-stimulated diffusi

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Fugol’, I. Ya, A. G. Belov, E. M. Yurtaeva, and V. N. Svishchev. "Exciton kinetics in xenon–krypton cryocrystals." Soviet Journal of Low Temperature Physics 12, no. 1 (1986): 39–43. https://doi.org/10.1063/10.0031423.

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On the basis of experimental studies of the luminescence of Xe–Kr solid solutions under electronic excitation as well as on the basis of an analysis of the results within the framework of the model of diffusion motion in Xe–Kr solid solutions, we examine the mechanisms of the migration and relaxation of electronic excitations of the matrix and also study the processes of energy transfer to the impurity states of K and Xe2. It is shown that in pure Kr crystals and low-concentration solutions (c &lt; 0.1 mole % Xe) the migration of excitations is due mainly to the diffusion of free excitons.

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7

Achtstein, Alexander W., Sabrine Ayari, Sophia Helmrich, et al. "Tuning exciton diffusion, mobility and emission line width in CdSe nanoplatelets via lateral size." Nanoscale 12, no. 46 (2020): 23521–31. http://dx.doi.org/10.1039/d0nr04745g.

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8

MORI, K., M. YOKOYA, H. NISHIMURA, M. NAKAYAMA, and H. ISHIBASHI. "SCINTILLATION MECHANISM OF Ce3+ DOPED Gd2SiO5." International Journal of Modern Physics B 15, no. 28n30 (2001): 3877–80. http://dx.doi.org/10.1142/s0217979201008895.

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Measuring the spectra of absorption, luminescence and excitation, and the decay times of the luminescence, at various temperatures, we investigate the scintillation mechanism of Ce 3+ doped Gd 2 SiO 5 (GSO:Ce). We conclude that the excitation energy created by gamma-ray irradiation relaxes to the core exciton states formed by the 4f-4f transitions of Gd 3+, and the core exciton migrates to collide with Ce 3+, and transfers the energy to Ce 3+ to emit the luminescence. We also conclude that the decay time of the Ce 3+ luminescence in GSO:Ce (70 ns for the case of 0.5 mol% of Ce concentration) i

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9

Donatini, Fabrice, and Julien Pernot. "Exciton diffusion coefficient measurement in ZnO nanowires under electron beam irradiation." Nanotechnology 29, no. 10 (2018): 105703. http://dx.doi.org/10.1088/1361-6528/aaa638.

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10

Londi, Giacomo, Rishat Dilmurat, Gabriele D’Avino, Vincent Lemaur, Yoann Olivier, and David Beljonne. "Comprehensive modelling study of singlet exciton diffusion in donor–acceptor dyads: when small changes in chemical structure matter." Physical Chemistry Chemical Physics 21, no. 45 (2019): 25023–34. http://dx.doi.org/10.1039/c9cp05201a.

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We compare two small π-conjugated donor–bridge–acceptor organic molecules with the aim of rationalizing the origin for the enhancement in singlet exciton diffusion coefficient and length in 1 with respect to 2.

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11

Navozenko, O. M., V. M. Yashchuk, Yu P. Piryatinski, D. Gudeiko, A. P. Naumenko, and Yu L. Slominskii. "The Peculiarities of Singlet Electronic Excitation Energy Transfer Processes in Alq3 Films." Ukrainian Journal of Physics 65, no. 3 (2020): 196. http://dx.doi.org/10.15407/ujpe65.3.196.

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The absorption and luminescence of new boron-containing dyes in two-component films of Alq3 (matrix)-dye(impurity) (obtained by the method of thermal vacuum deposition) are studied. The comparison of the spectra of absorption, fluorescence, and fluorescence excitation of a dyes in one-component solutions and double-component films shows the existence of the effective electronic excitation energy transfer (EEET) from the matrix to dye molecules. Time-resolved spectra of two-component films also manifest strong EEET in these systems. For the estimation of the average exciton spreading length in

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12

Ščajev, Patrik. "Excitation and temperature dependent exciton-carrier transport in CVD diamond: Diffusion coefficient, recombination lifetime and diffusion length." Physica B: Condensed Matter 510 (April 2017): 92–98. http://dx.doi.org/10.1016/j.physb.2017.01.021.

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13

Yeboah, Douglas, and Jai Singh. "Dependence of Exciton Diffusion Length and Diffusion Coefficient on Photophysical Parameters in Bulk Heterojunction Organic Solar Cells." Journal of Electronic Materials 46, no. 11 (2017): 6451–60. http://dx.doi.org/10.1007/s11664-017-5679-2.

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14

Michaelis de Vasconcellos, Steffen, Robert Schmidt, Roberto Rosati, et al. "(Invited) Exciton Transport in Strained 2D Semiconductors." ECS Meeting Abstracts MA2023-02, no. 34 (2023): 1626. http://dx.doi.org/10.1149/ma2023-02341626mtgabs.

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Being atomically thin, flexible, and exhibiting considerable light emission and ultrafast non-equilibrium dynamics, semiconducting transition metal dichalcogenides (TMDs) have been considered as promising candidates for next-generation optoelectronic devices. The optical and electronic properties of TMDs are governed by a rich landscape of tightly bound excitons, including regular bright excitons, as well as optically inaccessible dark exciton states. Recently, strain engineering of monolayer TMDs has been introduced to tune their optical properties, such as the exciton transition energy, exci

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15

Montilla, Francisco, Andrés F. Quintero-Jaime, Francisco Huerta, and César Quijada. "Determination of exciton diffusion coefficient in conjugated polymer films: Novel method based on spectroelectrochemical techniques." Electrochimica Acta 387 (August 2021): 138419. http://dx.doi.org/10.1016/j.electacta.2021.138419.

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16

Ligthart, Arnout, Xander de Vries, Peter A. Bobbert, and Reinder Coehoorn. "Single-layer method for quantifying the triplet exciton diffusion coefficient in disordered organic semiconductor materials." Organic Electronics 77 (February 2020): 105510. http://dx.doi.org/10.1016/j.orgel.2019.105510.

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17

Yao, Wendian, Dong Yang, and Dehui Li. "(Poster Award - 2nd Place) Layer-Number Engineered Momentum-Indirect Interlayer Excitons with Large Spectral Tunability." ECS Meeting Abstracts MA2023-02, no. 34 (2023): 1642. http://dx.doi.org/10.1149/ma2023-02341642mtgabs.

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The diversity of two-dimensional (2D) materials provides van der Waals heterostructures with abundant degrees of freedom and makes the family a promising candidate to realize novel optoelectronic devices and an attractive platform for exploring physical phenomena. Interlayer excitons in type-II van der Waals heterostructures are equipped with an oriented permanent dipole moment and long lifetime and thus would allow promising applications in excitonic and optoelectronic devices. However, in the widely studied van der Waals heterostructures constructed by transition metal dichalcogenides, the f

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18

Paulson, Bjorn, Yeonhee Shin, Akimitsu Okamoto, Yeon-Mok Oh, Jun Ki Kim, and Chan-Gi Pack. "Poly(A)+ Sensing of Hybridization-Sensitive Fluorescent Oligonucleotide Probe Characterized by Fluorescence Correlation Methods." International Journal of Molecular Sciences 22, no. 12 (2021): 6433. http://dx.doi.org/10.3390/ijms22126433.

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Ribonucleic acid (RNA) plays an important role in many cellular processes. Thus, visualizing and quantifying the molecular dynamics of RNA directly in living cells is essential to uncovering their role in RNA metabolism. Among the wide variety of fluorescent probes available for RNA visualization, exciton-controlled hybridization-sensitive fluorescent oligonucleotide (ECHO) probes are useful because of their low fluorescence background. In this study, we apply fluorescence correlation methods to ECHO probes targeting the poly(A) tail of mRNA. In this way, we demonstrate not only the visualizat

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19

Ikyo, B. A., A. F. Ochai, and A. Itodo. "Determination of Efficiency Parameters in tin Halide Perovskite Solar Cells." NIGERIAN ANNALS OF PURE AND APPLIED SCIENCES 1 (March 8, 2019): 294–300. http://dx.doi.org/10.46912/napas.52.

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Perovskite solar cells have gained significant attention in photovoltaic research. Just within a few years, the efficiencies of perovskite-based solar cells have been improved significantly to over 20% which makes them comparably efficient to silicon-based solar cells. The reason for such high recorded efficiencies are due to perovskites ease of processing, a high carrier diffusion length, low exciton binding energy and high absorption coefficient. Theoretical calculations were carried out based on the detailed balanced model on some Tin Halide Perovskite absorbers. For CH3 NH3 SnI3 , results

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20

Zelenin, Yu A., and T. A. Bilyi. "New hyperbolic statistics for the equilibrium distribution function of interacting electrons." Geofizicheskiy Zhurnal 44, no. 6 (2023): 112–19. http://dx.doi.org/10.24028/gj.v44i6.273643.

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New statistics of a low-parameter distribution of the sech (ε, µ) type are presented, which reproduce the results of plasma simulation by the method of dynamics of many particles (DMP) with high accuracy. The distribution is based on a conceptual model of a two-component plasma — virtual quasiparticles of negative energy (exciton phase ε<0); the scattering region of positive energy (gas phase ε>0). Optimization and elementary estimates of the applicability of the sech (ε, µ) distribution statistics were made after the results of DMP experiments. The sech (ε,µ) distribution reduces the nu

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21

Sneyd, Alexander J., Tomoya Fukui, David Paleček, et al. "Efficient energy transport in an organic semiconductor mediated by transient exciton delocalization." Science Advances 7, no. 32 (2021): eabh4232. http://dx.doi.org/10.1126/sciadv.abh4232.

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Efficient energy transport is desirable in organic semiconductor (OSC) devices. However, photogenerated excitons in OSC films mostly occupy highly localized states, limiting exciton diffusion coefficients to below ~10−2 cm2/s and diffusion lengths below ~50 nm. We use ultrafast optical microscopy and nonadiabatic molecular dynamics simulations to study well-ordered poly(3-hexylthiophene) nanofiber films prepared using living crystallization-driven self-assembly, and reveal a highly efficient energy transport regime: transient exciton delocalization, where energy exchange with vibrational modes

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22

Wang, Kaijie, Ye Tian, Heng Jiang, Meng Chen, and Shuangyan Xu. "Surface Treatment on Nickel Oxide to Enhance the Efficiency of Inverted Perovskite Solar Cells." International Journal of Photoenergy 2019 (November 4, 2019): 1–7. http://dx.doi.org/10.1155/2019/4360816.

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The organic-inorganic hybrid perovskites such as CH3NH3PbI3 have been considered as one of the most promising candidates for the next-generation photovoltaic materials due to its high absorption coefficient, low exciton binding energy, and long diffusion length. Herein, we have chosen NiOx as the hole transport material because metal oxides exhibit robust properties in air. We synthesized the NiOx film by a common sol-gel method. It is found that high-temperature annealing (500°C) is required to ensure the perovskite solar cell (PSC) with an efficiency over 15%. Low-temperature annealing (100°

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23

Yun, Kwang-Ro, and Tae-Yeon Seong. "Manufacturing [001]-Oriented FAPbI₃ Photodetectors Exhibiting Outstanding Air Stability through Eco-Friendly Anti-Solvent Additive Engineering." ECS Meeting Abstracts MA2024-02, no. 19 (2024): 1728. https://doi.org/10.1149/ma2024-02191728mtgabs.

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Organic-inorganic halide perovskite (OIHP) have gained widespread attention for various optoelectronic applications, including photovoltaics, thin-film transistors, and light-emitting diodes. Among them, OIHPs stand out as promising materials for photodetector applications due to their exceptional optoelectronic properties such as long exciton diffusion length, low exciton binding energy, high absorption coefficient, and tunable bandgap. Anti-solvent engineering is crucial method for enhancing performance of OIHP films by facilitating nucleation and crystal growth. However, traditional anti-so

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24

Sabelfeld, Karl, and Ivan Aksyuk. "Stochastic simulation of exciton transport in semiconductor heterostructures." Russian Journal of Numerical Analysis and Mathematical Modelling 39, no. 3 (2024): 143–56. http://dx.doi.org/10.1515/rnam-2024-0014.

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Abstract Stochastic simulation algorithm for solving exciton transport in a 3D layered semiconductor heterostructure is developed. The problem is governed by a transient drift-diffusion-recombination equation with Dirichlet and Neumann mixed boundary conditions. The semiconductor is represented as an infinite multilayer of finite thickness along the transverse coordinate z. The multilayer is composed by a set of sublayers of different materials so that the excitons have different diffusion and recombination coefficients in each layer. Continuity of solutions and fluxes at the plane interfaces

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25

Moorthy, Vijai Meyyappan, and Viranjay M. Srivastava. "Device Modelling and Optimization of Nanomaterial-Based Planar Heterojunction Solar Cell (by Varying the Device Dimensions and Material Parameters)." Nanomaterials 12, no. 17 (2022): 3031. http://dx.doi.org/10.3390/nano12173031.

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The objective of this work is to model a multi-disciplinary (multi-physics) organic photovoltaic (OPV) using mathematical modeling and analyzing the behavior of a standard planar heterojunction (PHJ) or bi-layer thin-film photovoltaic device, supporting the optimization of an efficient device for future production and assisting in evaluating and choosing the materials required for the efficient device. In order to increase photodiode performance, the device structure and geometrical properties have also been optimized and evaluated. In this work, the effects of varying the device size and tran

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Mangrulkar, Mayuribala, and Keith J. Stevenson. "The Progress of Additive Engineering for CH3NH3PbI3 Photo-Active Layer in the Context of Perovskite Solar Cells." Crystals 11, no. 7 (2021): 814. http://dx.doi.org/10.3390/cryst11070814.

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Methylammonium lead triiodide (CH3NH3PbI3/MAPbI3) is the most intensively explored perovskite light-absorbing material for hybrid organic–inorganic perovskite photovoltaics due to its unique optoelectronic properties and advantages. This includes tunable bandgap, a higher absorption coefficient than conventional materials used in photovoltaics, ease of manufacturing due to solution processability, and low fabrication costs. In addition, the MAPbI3 absorber layer provides one of the highest open-circuit voltages (Voc), low Voc loss/deficit, and low exciton binding energy, resulting in better ch

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Shukla, Naman, K. Anil Kumar, Madhu Allalla, and Sanjay Tiwari. "Analysis of High Efficient Perovskite Solar Cells Using Machine Learning." Journal of Ravishankar University (PART-B) 35, no. 1 (2022): 09–15. http://dx.doi.org/10.52228/jrub.2022-35-1-2.

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Affordable manufacturing along with high efficiency perovskite solar cell in photovoltaic technology has everyone's attention. Perovskite, which is in the lead role in solar cells, is full of characteristics such as high absorption coefficient, low exciton binding energy, charge carrier capable of having better mobility as well as more diffusion length and availability in suitable energy band. The application of machine learning technology is proving to be a boon to ensure optimum implementation with different properties in photovoltaic device, design, simple construction process and low-cost

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28

Sharipov, Alexander, Boris Loukhovitski, and Alexey Pelevkin. "Diffusion Coefficients of Electronically Excited Molecules." Physical-Chemical Kinetics in Gas Dynamics 22, no. 1 (2021): 1–12. http://dx.doi.org/10.33257/phchgd.22.1.913.

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29

Sharipov, A. S., B. I. Loukhovitski, and A. V. Pelevkin. "Diffusion Coefficients of Electronically Excited Molecules." Fluid Dynamics 58, no. 4 (2023): 787–95. http://dx.doi.org/10.1134/s0015462823600943.

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30

Chandrabose, Sreelakshmi, Kai Chen, Alex J. Barker, et al. "High Exciton Diffusion Coefficients in Fused Ring Electron Acceptor Films." Journal of the American Chemical Society 141, no. 17 (2019): 6922–29. http://dx.doi.org/10.1021/jacs.8b12982.

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31

Lian, Tianquan. "(Keynote) Rational Design of Quantum Dot/Mediator Interfaces for Triplet Energy Transfer and Photon Upconversion." ECS Meeting Abstracts MA2022-02, no. 20 (2022): 911. http://dx.doi.org/10.1149/ma2022-0220911mtgabs.

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Photon upconversion, where two or more low energy photons are converted into one high energy photon, shows great potential in bioimaging, catalysis and solar energy conversion. Photon upconversion has traditionally been realized with lanthanide-doped nanoparticles, or organic dye sensitized triplet-triplet annihilation (TTA) based upconversion platforms. In recent years, QD sensitized triplet-triplet annihilation based upconversion systems have achieved impressive upconversion quantum efficiency and demonstrated many unique advantages, including high photostability, large extinction coefficien

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32

Lian, Tianquan. "(Invited) Rational Design of Quantum Dot/Mediator Interfaces for Triplet Energy Transfer and Photon Upconversion." ECS Meeting Abstracts MA2023-01, no. 14 (2023): 1362. http://dx.doi.org/10.1149/ma2023-01141362mtgabs.

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Photon upconversion, where two or more low energy photons are converted into one high energy photon, shows great potential in bioimaging, catalysis and solar energy conversion. Photon upconversion has traditionally been realized with lanthanide-doped nanoparticles, or organic dye sensitized triplet-triplet annihilation (TTA) based upconversion platforms. In recent years, QD sensitized triplet-triplet annihilation based upconversion systems have achieved impressive upconversion quantum efficiency and demonstrated many unique advantages, including high photostability, large extinction coefficien

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33

Nagaya Wong, Narumi, Seung Kyun Ha, Kristopher Williams, Wenbi Shcherbakov-Wu, James W. Swan, and William A. Tisdale. "Robust estimation of charge carrier diffusivity using transient photoluminescence microscopy." Journal of Chemical Physics 157, no. 10 (2022): 104201. http://dx.doi.org/10.1063/5.0100075.

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Transient microscopy has emerged as a powerful tool for imaging the diffusion of excitons and free charge carriers in optoelectronic materials. In many excitonic materials, extraction of diffusion coefficients can be simplified because of the linear relationship between signal intensity and local excited state population. However, in materials where transport is dominated by free charge carriers, extracting diffusivities accurately from multidimensional data is complicated by the nonlinear dependence of the measured signal on the local charge carrier density. To obtain accurate estimates of ch

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34

Fusco, Roberta, Vincenza Granata, Mario Sansone, et al. "Intravoxel Incoherent Motion Model of Diffusion Weighted Imaging and Diffusion Kurtosis Imaging in Differentiating of Local Colorectal Cancer Recurrence from Scar/Fibrosis Tissue by Multivariate Logistic Regression Analysis." Applied Sciences 10, no. 23 (2020): 8609. http://dx.doi.org/10.3390/app10238609.

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Purpose: The aim of the study is to evaluate the potential of Intravoxel incoherent motion model of diffusion weighted imaging (DWI) and diffusion kurtosis imaging (DKI) in the differentiation of local colorectal cancer recurrence (LCR) from scar/fibrosis tissue in patients that underwent chemo-radiation therapy followed by the total mesorectal excision (TME) for locally advanced rectal cancer (LARC). Methods: Fifty-six patients were retrospectively included for the image analysis. Diffusion and perfusion parameters were extracted by DWI data (apparent diffusion coefficient (ADC), pseudo-diffu

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Chen, Chuan, Guanzhao Wen, Zijie Xiao, et al. "Charge Photogeneration and Recombination Dynamics in PTQ10:Y6 Solar Cells." Photonics 9, no. 12 (2022): 892. http://dx.doi.org/10.3390/photonics9120892.

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In this work, charge photogeneration dynamics in PTQ10:Y6 solar cells were studied by steady-state and time-resolved spectroscopies. For neat donor and acceptor films, we determined the exciton diffusion coefficients of PTQ10 and Y6 as 1.3 × 10−3 cm2·s−1 and 6.8 × 10−3 cm2·s−1, respectively. Furthermore, we find the LUMO and HOMO level offsets of 0.14 eV and 0.11 eV are sufficient for the dissociation of donor and acceptor excitons, respectively. For PTQ10:Y6 blend films, we find DIO additive could increase the scales of acceptor and donor phases. The acceptor phase increased slightly from 17.

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Bates, Matthew, Sophia Y. Lunt, and Richard R. Lunt. "Impact of charge character on anionic cyanine-based organic salt photovoltaics." Journal of Applied Physics 132, no. 8 (2022): 085501. http://dx.doi.org/10.1063/5.0104901.

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Small bandgap organic compounds with absorption in the near-infrared are exciting materials for a variety of applications ranging from light harvesters in photovoltaics to active agents in photodynamic therapy. Organic salts, a class of small molecule organic compounds comprised of an ionic chromophore and a counterion, have been used in opaque and transparent photovoltaics, primarily as donor materials in bilayer architectures. They possess excellent molecular extinction coefficients with near-infrared selective absorption, adjustable bandgaps, and tunable energy levels. To approach organic s

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BRAUN, OLEG M., IRINA I. ZELENSKAYA, and YURI S. KIVSHAR. "DIFFUSION IN THE FRENKEL–KONTOROVA MODEL WITH ANHARMONIC INTERATOMIC INTERACTIONS." International Journal of Modern Physics B 08, no. 17 (1994): 2353–89. http://dx.doi.org/10.1142/s0217979294000968.

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Low-temperature diffusion and transport properties of the generalized Frenkel–Kontorova model are investigated analytically in the framework of a phenomenological approach which treats a system of strongly interacting atoms as a system of weaklyinteracting quasiparticles (kinks). The model takes into account realistic (anharmonic) interaction of particles subjected into a periodic substrate potential, and such a generalization leads to a series of novel effects which we expect are related to the experimentally-observed phenomena in several quasi-one-dimensional systems. Analysing the concentra

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38

Pataraya, A. D., and T. A. Pataraya. "Non-linear dynamo waves in an incompressible medium when the turbulence dissipative coefficients depend on temperature." Annales Geophysicae 15, no. 1 (1997): 97–100. http://dx.doi.org/10.1007/s00585-997-0097-z.

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Abstract. Non-linear α-ω; dynamo waves existing in an incompressible medium with the turbulence dissipative coefficients depending on temperature are studied in this paper. We investigate of α-ω solar non-linear dynamo waves when only the first harmonics of magnetic induction components are included. If we ignore the second harmonics in the non-linear equation, the turbulent magnetic diffusion coefficient increases together with the temperature, the coefficient of turbulent viscosity decreases, and for an interval of time the value of dynamo number is greater than 1. In these conditions a stat

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Takeda, Jun, Takenari Goto, and Masahiro Matsuoka. "Lifetime and Diffusion Coefficient of Free and Momentarily Localized Excitons in Red-HgI2." Journal of the Physical Society of Japan 57, no. 9 (1988): 3248–55. http://dx.doi.org/10.1143/jpsj.57.3248.

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Flanders, Nathan C., Matthew S. Kirschner, Pyosang Kim, et al. "Large Exciton Diffusion Coefficients in Two-Dimensional Covalent Organic Frameworks with Different Domain Sizes Revealed by Ultrafast Exciton Dynamics." Journal of the American Chemical Society 142, no. 35 (2020): 14957–65. http://dx.doi.org/10.1021/jacs.0c05404.

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Lavenda, B. H. "On the Law of Equipartition for Translational Motion of Excited Molecules in Equilibrium with Thermal Radiation." Zeitschrift für Naturforschung A 44, no. 4 (1989): 273–77. http://dx.doi.org/10.1515/zna-1989-0404.

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Abstract Einstein’s radiation theory consists of two parts: the derivation of Planck's radiation law from a physical mechanism of absorption and emission of radiation by excited molecules that are in thermal equilibrium with the radiation field and a demonstration of the validity of the law of equipartition of energy for the translational motion of the molecules. Several incongruities are observed: Einstein could not have legitimately substituted back into his dynamical equilibrium condition, valid at any finite temperature, a limiting condition between the coefficients of absorption and stimu

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Borowicz, Paweł, and Bernhard Nickel. "The Kinetics of Joined Action of Triplet-Triplet Annihilation and First-Order Decay of Molecules in T1State in the Case of Nondominant First-Order Process: The Kinetic Model in the Case of Spatially Periodic Excitation." Journal of Spectroscopy 2013 (2013): 1–16. http://dx.doi.org/10.1155/2013/346826.

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In this paper the model developed for estimation of the diffusion coefficient of the molecules in the triplet state is presented. The model is based on the intuitive modification of the Smoluchowski equation for the time-dependent rate parameter. Since the sample is irradiated with the spatially periodic pattern nonexponential effects can be expected in the areas of the constructive interference of the exciting laser beams. This nonexponential effects introduce changes in the observed kinetics of the diffusion-controlled triplet-triplet annihilation. Due to irradiation with so-called long exci

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Kucharek, H., M. Scholder, and A. P. Matthews. "Three-dimensional simulation of the electromagnetic ion/ion beam instability: cross field diffusion." Nonlinear Processes in Geophysics 7, no. 3/4 (2000): 167–72. http://dx.doi.org/10.5194/npg-7-167-2000.

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Abstract. In a system with at least one ignorable spatial dimension charged particles moving in fluctuating fields are tied to the magnetic field lines. Thus, in one-and two-dimensional simulations cross-field diffusion is inhibited and important physics may be lost. We have investigated cross-field diffusion in self-consistent 3-D magnetic turbulence by fully 3-dimensional hybrid simulation (macro-particle ions, massless electron fluid). The turbulence is generated by the electromagnetic ion/ion beam instability. A cold, low density, ion beam with a high velocity stream relative to the backgr

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Suzuki, S., and H. Itoh. "Determination of diffusion, reflection and deexcitation coefficients of metastable excited Ne(3P2) atom." Journal of Physics D: Applied Physics 49, no. 18 (2016): 185202. http://dx.doi.org/10.1088/0022-3727/49/18/185202.

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Song, Xiaolei, Ji Yi, and Jing Bai. "A Parallel Reconstruction Scheme in Fluorescence Tomography Based on Contrast of Independent Inversed Absorption Properties." International Journal of Biomedical Imaging 2006 (2006): 1–7. http://dx.doi.org/10.1155/ijbi/2006/70839.

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Based on an independent forward model in fluorescent tomography, a parallel reconstructed scheme for inhomogeneous mediums with unknown absorption property is proposed in this paper. The method considers the two diffusion equations as separately describing the propagation of excited light in tissues with and without fluorescent probes inside. Then the concentration of fluorophores is obtained directly through the difference between two estimations of absorption coefficient which can be parallel inversed. In this way, the multiparameter estimation problem in fluorescent tomography is transforme

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Cheshire, Thomas P., Jéa Boodry, Erin A. Kober, et al. "A quantitative model of charge injection by ruthenium chromophores connecting femtosecond to continuous irradiance conditions." Journal of Chemical Physics 157, no. 24 (2022): 244703. http://dx.doi.org/10.1063/5.0127852.

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A kinetic framework for the ultrafast photophysics of tris(2,2-bipyridine)ruthenium(II) phosphonated and methyl-phosphonated derivatives is used as a basis for modeling charge injection by ruthenium dyes into a semiconductor substrate. By including the effects of light scattering, dye diffusion, and adsorption kinetics during sample preparation and the optical response of oxidized dyes, quantitative agreement with multiple transient absorption datasets is achieved on timescales spanning femtoseconds to nanoseconds. In particular, quantitative agreement with important spectroscopic handles—the

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Neimontas, K., R. Aleksiejūnas, M. Sūdžius, Kęstutis Jarašiūnas, and Peder Bergman. "Optical Studies of Nonequilibrium Carrier Dynamics in Highly Excited 4H-SiC Epitaxial Layers." Materials Science Forum 483-485 (May 2005): 413–16. http://dx.doi.org/10.4028/www.scientific.net/msf.483-485.413.

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We applied picosecond four-wave mixing technique to investigate carrier diffusion and recombination in n-type 4H-SiC epilayers. The dependence of bipolar diffusion coefficient D on photocarrier density was measured in range from ~ 1017 to ~ 1020 cm-3. We determined a decrease of D value from 3.4 to 2.2 cm2/s with increase of the photoexcitation level in range from ~ 1017 to ~ 1019 cm-3, and found its increase up to 3.8 cm2/s at carrier density above 1020 cm-3. Auger recombination governed decrease of carrier lifetime from 11 ns at ~ 1017 cm-3 to 1.8 ns at ~ 1020 cm- 3 has also been observed.

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Li, Shenghong, and Junting Lv. "Stochastic stability and the moment Lyapunov exponent for a gyro-pendulum system driven by a bounded noise." Mechanical Sciences 14, no. 2 (2023): 545–55. http://dx.doi.org/10.5194/ms-14-545-2023.

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Abstract. The stochastic stability of a gyro-pendulum system parametrically excited by a real noise is investigated by the moment Lyapunov exponent in the paper. Using the spherical polar and non-singular linear stochastic transformations and combining these with Khasminskii's method, the diffusion process and the eigenvalue problem of the moment Lyapunov exponent are obtained. Then, applying the perturbation method and Fourier cosine series expansion, we derive an infinite-order matrix whose leading eigenvalue is the second-order expansion g2(p) of the moment Lyapunov exponent. Thus, an infin

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Iglev, Hristo, Martin K. Fischer, and Alfred Laubereau. "Electron detachment from anions in aqueous solutions studied by two- and three-pulse femtosecond spectroscopy." Pure and Applied Chemistry 82, no. 10 (2010): 1919–26. http://dx.doi.org/10.1351/pac-con-09-12-04.

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The electron photodetachment of the aqueous halides and hydroxide is studied after resonant excitation in the lowest charge-transfer-to-solvent (CTTS) state. The initially excited state is followed by an intermediate assigned to a donor-electron pair that displays a competition of recombination and separation. Using pump–repump–probe (PREP) spectroscopy, the pair species is verified via a secondary excitation with separation of the pairs so that the yield of released electrons is increased. The observed recombination process on the one hand and the similar absorptions of the intermediate and t

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Harrison, P. "Differentiating between constant and concentration-dependent diffusion coefficients via the optical spectroscopy of excitons in quantum wells." Semiconductor Science and Technology 11, no. 7 (1996): 1022–25. http://dx.doi.org/10.1088/0268-1242/11/7/008.

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