Ergodicity, configurational entropy and free energy in pigment solutions and plant photosystems: Influence of excited state lifetime

2014 ◽  
Vol 187-188 ◽  
pp. 29-32 ◽  
Author(s):  
Robert C. Jennings ◽  
Giuseppe Zucchelli
Keyword(s):  
Free Energy ◽  
Excited State ◽  
Configurational Entropy ◽  
Excited State Lifetime

scholarly journals Impact of the Dynamic Electron Correlation on the Unusually Long Excited-State Lifetime of Thymine

2021 ◽  
pp. 4339-4346
Author(s):  
Woojin Park ◽  
Seunghoon Lee ◽  
Miquel Huix-Rotllant ◽  
Michael Filatov ◽  
Cheol Ho Choi
Keyword(s):  
Excited State ◽  
Electron Correlation ◽  
Excited State Lifetime

Measurement of excited-state lifetime using two-pulse photon echoes in rubidium vapor

2007 ◽  
Vol 24 (3) ◽  
pp. 671 ◽  
Author(s):  
E. A. Rotberg ◽  
B. Barrett ◽  
S. Beattie ◽  
S. Chudasama ◽  
M. Weel ◽  
...  
Keyword(s):  
Excited State ◽  
Excited State Lifetime ◽  
Rubidium Vapor ◽  
Photon Echoes ◽  
Pulse Photon

scholarly journals Excited State Lifetime Measurements in Rare Earth Nuclei with Fast Electronics

2011 ◽  
Vol 312 (9) ◽  
pp. 092062 ◽  
Author(s):  
V Werner ◽  
N Cooper ◽  
M Bonett-Matiz ◽  
E Williams ◽  
J-M Régis ◽  
...  
Keyword(s):  
Rare Earth ◽  
Excited State ◽  
Excited State Lifetime ◽  
Lifetime Measurements ◽  
Rare Earth Nuclei

Prolonged Excited-State Lifetime of Porphyrin Due to the Addition of Colloidal SiO2to Triton X-100 Micelles

Langmuir ◽  
2004 ◽  
Vol 20 (5) ◽  
pp. 1582-1586 ◽  
Author(s):  
Junhua Yu ◽  
Xuesong Wang ◽  
Baowen Zhang ◽  
Yuxiang Weng ◽  
Lei Zhang
Keyword(s):  
Excited State ◽  
Excited State Lifetime ◽  
Triton X

The Free Energy Simulation Approach to Grain Boundary Segregation In Cu-Ni

1990 ◽  
Vol 209 ◽  
Author(s):  
H. Y. Wang ◽  
R. Najafabadi ◽  
D. J. Srolovitz ◽  
R. Lesar
Keyword(s):  
Monte Carlo ◽  
Free Energy ◽  
Grain Boundary ◽  
Chemical Potential ◽  
Boundary Segregation ◽  
Configurational Entropy ◽  
Accurate Method ◽  
Increasing Temperature ◽  
Atomic Coordinates ◽  
Good Agreement

ABSTRACTA new, accurate method for determining equilibrium segregation to defects in solids is employed to examine the segregation of Cu to grain boundaries in Cu-Ni alloys. The results are in very good agreement with the ones given by Monte Carlo. This method is based upon a point approximation for the configurational entropy, an Einstein model for vibrational contributions to the free energy. To achieve the equilibrium state of a defect in an alloy the free energy is minimized with respect to atomic coordinates and composition of each site at constant chemical potential. One of the main advantages this new method enjoys over other methods such as Monte Carlo, is the efficiency with which the atomic structure of a defect, segregation and thermodynamic properties can be determined. The grain boundary free energy can either increase or decrease with increasing temperature due to the competition between energetic and configurational entropy terms. In general, the grain boundary free energy increases with temperature when the segregation is strongest.

Quenching effect of C-H bond in long lived NIR luminescent erbium complexes

2013 ◽  
Vol 1571 ◽  
Author(s):  
Laurent Divay ◽  
Christophe Galindo ◽  
Françoise Soyer ◽  
Evelyne Chastaing ◽  
Renato Bisaro ◽  
...  
Keyword(s):  
Excited State ◽  
Phenyl Ring ◽  
Near Infrared ◽  
Organic Ligand ◽  
Excited State Lifetime ◽  
Quenching Effect ◽  
Infrared Luminescence ◽  
Powder Samples ◽  
Order Of Magnitude ◽  
Erbium Ion

AbstractErbium excited state deactivation is studied for two fluorinated complexes based on N-(P,P-ditetrafluorophosphinoyl-P,P-ditetrafluorophenyl phosphinimidates and N-(P,P-dipentafluoro phosphinoyl)-P,P-dipentafluorophenyl phosphinimidates ligands. We show that the substitution of a fluorine atom in para-position by an hydrogen atom on each phenyl ring of the perfluorinated organic ligand results in a decrease in near infrared luminescence lifetimes from 800 µs to 70 µs when measured under vacuum on sublimated powder samples. These experiments show that the introduction of C-H bonds, although outside the first coordination sphere of the erbium ion, can still induce a one order of magnitude decrease in its excited state lifetime. The found lifetime however is still longer than most reported partially fluorinated complexes, which opens the way for new functionalized complexes.

Morphology control and photoluminescence properties of Eu3+-activated Y4Al2O9 nanophosphors for solid state lighting applications

CrystEngComm ◽  
2018 ◽  
Vol 20 (18) ◽  
pp. 2540-2552 ◽  
Author(s):  
Antika Das ◽  
Subhajit Saha ◽  
Karamjyoti Panigrahi ◽  
Anuradha Mitra ◽  
Rituparna Chatterjee ◽  
...  
Keyword(s):  
Excited State ◽  
Solid State ◽  
Morphology Control ◽  
Solid State Lighting ◽  
Color Purity ◽  
Photoluminescence Properties ◽  
Excited State Lifetime

Spherical Eu3+:Y4Al2O9 nanophosphors exhibit brilliant PL behavior with enhanced color purity and excited state lifetime.

Magnesium Tetra(phenylethynyl)porphyrin: Stepwise Synthetic Route, Crystal Structures, and Longer Singlet Excited-State Lifetime than Zinc Congener

2018 ◽  
Vol 13 (20) ◽  
pp. 3032-3039 ◽  
Author(s):  
Takafumi Nakagawa ◽  
Huan Wang ◽  
Anna Zieleniewska ◽  
Hiroshi Okada ◽  
Shinobu Aoyagi ◽  
...  
Keyword(s):  
Excited State ◽  
Crystal Structures ◽  
Singlet Excited State ◽  
Synthetic Route ◽  
Excited State Lifetime
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