quantum yield


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quan·tum yield (φ),

the number of molecules transformed (for example, via a reaction) per quantum of light absorbed; the inverse of the quantum requirement.
Synonym(s): quantum efficiency

quan·tum yield

(φ) (kwahn'tŭm yēld)
The number of molecules transformed (e.g., through a reaction) per quantum of light absorbed; the inverse of the quantum requirement.
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References in periodicals archive ?
The quantum yield for oxidation of ascorbic acid with methylene green was calculated as a function of concentration of ascorbic acid, concentration of methylene green, temperature, and percentage composition of alcohols such as aqueous methanol, aqueous ethanol and aqueous isopropanol at different temperatures ranging from 303 K to 318 K.
The local minimum in fluorescence quantum yield dependency on excitation wavelength for freshwater CDOM was found at [[lambda].sub.ex]~270-280nm, where the "blue shift" of CDOM fluorescence emission was typically observed as well [5-7].
Using octacationic Zn(II)-phthalocyanine with singlet quantum yield of 0.6, they were able to inactivate E.
Miller, "Relative fluorescence quantum yields using a computer-controlled luminescence spectrometer," Analyst, vol.
Kortshagen, "Silicon nanocrystals with ensemble quantum yields exceeding 60%," Appl.
The aggregation mechanism together with the possibility of dynamic quenching of excited states by water molecules (that act as quencher) decreases the quantum yield of fluorescence in the mixtures with higher amount of water [19].
The structural alterations of the palisade parenchyma of plantlets cultivated at 150 [micro]mol [m.sup.-2] [s.sup.-1] do not reduce their photosynthetic capacity because it does not differ from other parameters, like effective quantum yield from photosystem II ([DELTA]F/Fm') and increased C[O.sub.2] assimilation, consistent with the dry matter content observed in these plantlets.
Table 3: Effects of different planting patterns and irrigation on maximal quantum yield (Fv/Fm) in flag leaves of winter wheat in 2008-2009
To determine photosynthetic efficiency differences between the two varieties, quantum yield of photosynthesis ([phi]) was calculated.
Luminescence intensity and quantum yield of organic molecules and chromophore dyes when trapped in porous solid matrices are increased by several orders compared to their values in liquid solvent.
In order to maximize the amount of the emitted fluorescence (for nonsaturating illumination), the fluorescence quantum yield and the fluorescence absorbance have to be as large as possible [6].
Plants also exhibit numerous physiological adaptations to low irradiance, including increased quantum yield and reduced dark respiration, light compensation, and saturation points [12].

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