Charge Transfer Modeling for Charge-Coupled Devices

1997 ◽  
Vol 490 ◽  
Author(s):  
James P. Lavine ◽  
Eric G. Stevens ◽  
Edmund K. Banghart ◽  
Eugene A. Trabka ◽  
Bruce C. Burkey ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Random Walk ◽  
Charge Transfer ◽  
Three Dimensional ◽  
Electron Motion ◽  
Charge Coupled Device ◽  
Charge Coupled Devices ◽  
Spatial Dimensions ◽  
Random Walk Simulation ◽  
A Charge

ABSTRACTThe three-dimensional Poisson's equation is solved by iterative methods and the resulting electric field is used in Newton's equation to simulate electron transfer in a charge-coupled device (CCD). The time dependence of charge transfer is studied through a random walk simulation of Newton's equation. Potential obstacles of the order of 0.03 V are seen to slow charge transfer. Electron motion is also followed in two spatial dimensions through Newton's equation in order to probe a more varied set of potential obstacles.

An Approach Toward Emulating Molecular Interaction with a Graph

2006 ◽  
Vol 59 (12) ◽  
pp. 869 ◽  
Author(s):  
Hideaki Suzuki
Keyword(s):  
Random Walk ◽  
Molecular Interaction ◽  
Hard Sphere ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Atomic Clusters ◽  
Experimental Results ◽  
Random Walk Simulation ◽  
Mathematical Graph ◽  
Three Dimensional Space

Network artificial chemistry (NAC) uses a mathematical graph to emulate molecular interaction in a solvent. To emulate molecules' movement in a three-dimensional space, rewiring rules for NAC graphs’ edges must be designed to enable the edges to imitate the relations between molecules or atomic clusters. Our research formulated the ‘network energy’ representing this constraint and rewired the NAC graph to minimize the required energy. Experimental results for the NAC rewiring are compared with a hard-sphere random walk simulation.

Two-phase GaAs cermet-gate charge-coupled devices

1991 ◽  
Vol 69 (3-4) ◽  
pp. 224-228
Author(s):  
M. LeNoble ◽  
J. V. Cresswell ◽  
R. R. Johnson
Keyword(s):  
Charge Transfer ◽  
Electric Field ◽  
Electric Fields ◽  
Two Phase ◽  
Charge Coupled Device ◽  
Charge Coupled Devices ◽  
Band Limited ◽  
Gate Charge

A nonplanar 64-pixel, 2-phase GaAs cermet-gate charge-coupled device (CMCCD) and a planar 128-pixel, 2-phase GaAs CMCCD are described. The former device employs a castellation to provide the "built-in" electric field for controlling the flow of signal charge within the channel, whereas, the latter device uses externally applied electric fields to achieve this control. Both devices have been operated at 46 MHz, demonstrating charge transfer efficiencies of 0.996 and in excess of 0.999, respectively. The application of the planar 2-phase GaAs CMCCD in a 500 or 7.81 MHz transient digitizer module for acquisition and transfer of dc to 250 MHz band-limited signals will also be presented.

scholarly journals Electron transfer dynamics and excited state branching in a charge-transfer platinum(ii) donor–bridge-acceptor assembly

2014 ◽  
Vol 43 (47) ◽  
pp. 17677-17693 ◽  
Author(s):  
Paul A. Scattergood ◽  
Milan Delor ◽  
Igor V. Sazanovich ◽  
Oleg V. Bouganov ◽  
Sergei A. Tikhomirov ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Charge Transfer ◽  
A Charge

Luminescence and reactivity of a charge-transfer excited iron complex with nanosecond lifetime

Science ◽  
2018 ◽  
Vol 363 (6424) ◽  
pp. 249-253 ◽  
Author(s):  
Kasper Skov Kjær ◽  
Nidhi Kaul ◽  
Om Prakash ◽  
Pavel Chábera ◽  
Nils W. Rosemann ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Room Temperature ◽  
Iron Complex ◽  
Transfer Reactions ◽  
Carbene Ligands ◽  
Doublet Ground State ◽  
A Charge ◽  
Bimolecular Quenching ◽  
Metal Charge Transfer

Iron’s abundance and rich coordination chemistry are potentially appealing features for photochemical applications. However, the photoexcitable charge-transfer states of most iron complexes are limited by picosecond or subpicosecond deactivation through low-lying metal-centered states, resulting in inefficient electron-transfer reactivity and complete lack of photoluminescence. In this study, we show that octahedral coordination of iron(III) by two mono-anionic facialtris-carbene ligands can markedly suppress such deactivation. The resulting complex [Fe(phtmeimb)2]+, where phtmeimb is {phenyl[tris(3-methylimidazol-1-ylidene)]borate}−, exhibits strong, visible, room temperature photoluminescence with a 2.0-nanosecond lifetime and 2% quantum yield via spin-allowed transition from a doublet ligand-to-metal charge-transfer (2LMCT) state to the doublet ground state. Reductive and oxidative electron-transfer reactions were observed for the2LMCT state of [Fe(phtmeimb)2]+in bimolecular quenching studies with methylviologen and diphenylamine.

Wave-Function Symmetry Control of Electron-Transfer Pathways within a Charge-Transfer Chromophore

2020 ◽  
Vol 11 (19) ◽  
pp. 8399-8405
Author(s):  
Bruno M. Aramburu-Trošelj ◽  
Ivana Ramírez-Wierzbicki ◽  
Franco Scarcasale ◽  
Paola S. Oviedo ◽  
Luis M. Baraldo ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Wave Function ◽  
Charge Transfer ◽  
Electron Transfer Pathways ◽  
A Charge

Three-dimensional light microscopy for the analysis of chromosome organization in Drosophila embryo

1991 ◽  
Vol 49 ◽  
pp. 42-43
Author(s):  
Yasushi Hiraoka ◽  
Abby F. Dernburg ◽  
Susan J. Parmelee ◽  
Mary C. Rykowski ◽  
David A. Agard ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Single Layer ◽  
Drosophila Embryo ◽  
Chromosome Organization ◽  
Optical Sectioning ◽  
Charge Coupled Device ◽  
Homologous Chromosomes ◽  
Nuclear Structures ◽  
A Charge ◽  
Blastoderm Stage

We are interested in the three-dimensional physical relationships among chromosomes in mitotically active nuclei. Using high-resolution, three-dimensional optical sectioning microscopy incorporating a charge-coupled device (CCD), we have analyzed the spatial arrangements of chromosomes in nuclei from Drosophila melanogaster embryos. During early stages of nuclear division, these embryos exist as syncytial blastoderms, with up to 5000 nuclei forming a single layer near the embryo's surface and dividing essentially synchronously. This greatly facilitates the analysis of chromosome organization because of the simple monolayer arrangement of nuclear structures at defined mitotic stages.From prophase to anaphase, three-dimensional paths of condensed chromosomes stained with a DNA-specific fluorescent dye can be traced using an interactive computer program. We have used this method to ask the specific biological question of whether pairs of homologous chromosomes have a consistent, ordered arrangement in diploid nuclei. Our results have shown that homologous chromosomes are not associated with each other from prophase to anaphase in syncytial blastoderm stage embryos.

scholarly journals The Determination Of Diffusive Tortuosity In Concrete Specimens Using X-Ray Microtomography

2015 ◽  
Vol 60 (2) ◽  
pp. 1115-1119 ◽  
Author(s):  
Z. Ranachowski ◽  
D. Jóźwiak-Niedźwiedzka ◽  
P. Ranachowski ◽  
M. Dąbrowski ◽  
S. Kudela ◽  
...  
Keyword(s):  
Random Walk ◽  
Three Dimensional ◽  
Micro Ct ◽  
Connectivity Analysis ◽  
Pore Connectivity ◽  
Cement Ratio ◽  
X Ray ◽  
Water To Cement Ratio ◽  
Random Walk Simulation

Abstract The paper presents a method of pore connectivity analysis applied to specimens of cement based composites differing in water to cement ratio. The method employed X-ray microtomography (micro-CT). Microtomography supplied digitized three-dimensional radiographs of small concrete specimens. The data derived from the radiographs were applied as an input into the application based on the algorithm called ‘random walk simulation’. As the result a parameter called diffusive tortuosity was established and compared with estimated porosity of examined specimens.

EXCITED-STATE INTRAMOLECULAR ELECTRON TRANSFER COUPLED WITH EXCITED-STATE INTRAMOLECULAR PROTON TRANSFER IN PHOTOINDUCED ENOL TO KETO TAUTOMERIZATION

2009 ◽  
Vol 08 (supp01) ◽  
pp. 1073-1086
Author(s):  
YUANZUO LI ◽  
SHASHA LIU ◽  
LILI ZHAO ◽  
MAODU CHEN ◽  
FENGCAI MA ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Charge Transfer ◽  
Proton Transfer ◽  
Molecular Orbital ◽  
Energy Levels ◽  
Three Dimensional ◽  
Intramolecular Proton Transfer ◽  
Intramolecular Electron Transfer ◽  
Lowest Unoccupied Molecular Orbital

In this paper, the two-dimensional (2D) site and the three-dimensional (3D) cube representations [Sun MT, J Chem Phys124: 054903, 2006] have been further developed to study the charge transfer during excited-state relaxation. With these newly developed representations, we theoretically investigate the excited-state intramolecular electron transfer (ESIET) in enol excited-state geometry relaxation, and ESIET coupled with excited-state intramolecular proton transfer (ESIPT) in phototautomerization (in enol to keto transformation). The energy levels of highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of HBODC in enol and keto absorption and fluorescence are compared to understand photoinduced ESIET and ESIPT process. The excited regions of molecule (where arrangement of electron density takes place during excited-state relaxation) are located with 2D site representation. 3D cube representations visualize the character of charge transfer (CT) in those regions. Results of the research indicate that the ability of charge transfer during enol excited-state geometry relaxation is much stronger than that in phototautomerization.

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