fluorescence yield

fluorescence yield

[flu̇′res·əns ‚yēld]
(atomic physics)
The probability that an atom in an excited state will emit an x-ray photon in its first transition rather than an Auger electron.
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The so-called Shockley-Queisser limit assumes 100 percent internal fluorescence yield, as one photon of sunlight can in theory excite one electron in the silicon grid.
At low concentrations, the fluorescence yield of chlorophyll b apparently increased.
The room-temperature fluorescence quantum yields of compounds 3a, 3b and 3c in degassed CH2Cl2 solution have been confirmed by comparing with the known fluorescence yield from PtTPP (I = 0.046) [34].
The molar extinction coefficient to C1 in dichloromethane as lipophilic environment was [epsilon] 31 717, absorption lab 425 nm, emission lem 530 nm, relative quantum fluorescence yield [F.sub.f] 0,48.
Caption: FIGURE 5: Fe K-edge XANES spectra in fluorescence yield of wool fibre dyed with FeS[O.sub.4] mordant (red) compared to [Fe.sub.2][O.sub.3] (black) and FeO (light blue) standards measured in total electron yield.
The malate treatment increased leaf malate content, NADPH/NADP ratio, and the initial fluorescence yield (F0) and decreased photosynthetic oxygen evolution, the maximum fluorescence (Fm), the maximal efficiency of PS II photochemistry (Fv/Fm), and the number of active PSII reaction centers per excited cross section (RC/CSm).
From this curve, the effective quantum yield of PSII [Y-II = ([F.sub.m]'--F')/[F.sub.m]; where F' = fluorescence recorded just before the beginning of a strong light pulse and [F.sub.m], = maximum fluorescence yield when the reaction centers of PSII are closed by a strong light pulse] and the non-photochemical quenching of the fluorescence [NPQ = ([F.sub.m]/ [F.sub.m]')--1, Kooten & Snel, 1990] were obtained.
The addition of the herbicide DCMU induces a fast rise of the fluorescence yield during the first 2 ms of illumination; it transforms the regular OJIP sequence into an OJ curve (STRASSER et al., 1995).
2:00 DISTORTIONS IN 2p4d PARTIAL FLUORESCENCE YIELD FOR 4d ELEMENTS, Alexander Price, Frank de Groot2 and Trinanjan Datta', 'Georgia Regents University, Augusta, GA 30912 and 2Utrecht University, Netherlands.
Ueno, "A measurement of the air fluorescence yield," Nuclear Instruments and Methods in Physics Research A, vol.
The quantum fluorescence yield of MDs in all organic solvents was calculated on the basis of the absorption and fluorescence spectra using
The variable fluorescence yield, [F.sub.v], was determined by [F.sub.m] - [F.sub.0].
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