quantum yield


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quantum yield

[′kwän·təm ′yēld]
(physical chemistry)
For a photochemical reaction, the number of moles of a stated reactant disappearing, or the number of moles of a stated product produced, per einstein of light of the stated wavelength absorbed.
References in periodicals archive ?
The effect of concentration of ascorbic acid, concentration of methylene green and temperature ranges from 303K to 318 K on quantum yield of reaction were studied and mechanism of reaction was proposed on the basis of kinetics data.
Quantum efficiency (Fv/Fm) (A) and quantum yield of photosystem II (Yield) (B) in 'Gigante' cactus pear cultivated at different spacings and bovine manure doses during July-August (dry season)
The fluorescence quantum yield measurement is sometimes used to characterize aquatic CDOM of marine, riverine, or coastal origin.
The central metal ion helps in increasing the quantum yield and the lifetime of the triplet; this in turn helps in the generation of singlet oxygen that helps in destruction of pathogenic microbes [18,41].
Fluorescence quantum yields in solution were determined according to the procedure reported in literature [36, 37], the boron compound exhibits lower values of fluorescence quantum yields of 2.9 to 4.1 than similar compounds reported as V-VIII [28], these low values of [[PHI].sub.F] can be due to the presence of electro-attractor atoms like fluorine and the promotion of nonradiative processes, and this behavior is similar to that reported by Kubota et al.
Jin, "Silicon nanoparticles with surface nitrogen: 90% quantum yield with narrow luminescence bandwidth and the ligand structure based energy law," ACS Nano, Vol.
The measurements of quantum yield of singlet oxygen ([sup.1][O.sub.2]) production were performed using spectrometer (Edinburg Analytical Instruments).
Data regarding the effective quantum yield of photosystem II ([DELTA]F/Fm), non-photochemical quenching (NPQ), electron transport rate (ETR) and photochemical quenching (qP) did not differ between the plantlets cultured at different PPFDs.
The present study determined that different precision planting patterns and deficit irrigation treatments affect the NAR at different growth stages (GSs); chlorophyll content and maximal quantum yield of PS II in flag leaves; grain yield and net photosynthetic rate (Pn) of winter wheat.
Gas exchange and quantum yield were not significantly different between varieties.
But the payoff, Forte says, is that "the fluorescent quantum dot nanoparticle produces a photo-luminescent signature that is very precise and may be evaluated to determine additional measurable characteristics such as quantum yield, absorption, fluorescence decay, blink rate, chemical composition, and more.
The fluorescence properties of the GQDs, such as quantum yields, fluorescence life time, and photostability, were measured and the fluorescence quantum yield was as high as 54.5 %.

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