Magnetic field effect on the fluorescence from γ-irradiated solutions of perfluorocarbons

1979 ◽  
Vol 57 (23) ◽  
pp. 3023-3027 ◽  
Author(s):  
Robert Smith Dixon ◽  
Vincent John Lopata
Keyword(s):  
Magnetic Field ◽  
Fluorescence Intensity ◽  
Field Effect ◽  
Hyperfine Coupling ◽  
Fluorescence Enhancement ◽  
Relative Proportion ◽  
Magnetic Field Effect ◽  
Radical Ions ◽  
Field Independent ◽  
High Fields

The effect of an applied magnetic field on the fluorescence from γ-irradiated solutions of perfluorobiphenyl and perfluoronaphthalene has been measured in various solvents. In all the solvents used (cyclohexane, squalane, isooctane) the fluorescence intensity increases with increasing field and tends towards a plateau at high fields (>0.1 T). At low fields, the fluorescence enhancement is smaller for the perfluorocarbons than for the parent hydrocarbons, due to the larger electron–nuclear hyperfine coupling and broader spread of the hyperfine levels in the radical ions of the perfluorocarbons. At high fields the fluorescence enhancement is also smaller for the perfluorocarbons than for the parent hydrocarbons, indicating a larger relative proportion of prompt (field-independent) fluorescence for the perfluorocarbons than for the parent hydrocarbons.

scholarly journals Magnetic field effect on triplets and radical ions in reaction centers of photosynthetic bacteria

FEBS Letters ◽  
1980 ◽  
Vol 110 (1) ◽  
pp. 129-132 ◽  
Author(s):  
M.E. Michel-Beyerle ◽  
H. Scheer ◽  
H. Seidlitz ◽  
D. Tempus
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Photosynthetic Bacteria ◽  
Magnetic Field Effect ◽  
Reaction Centers ◽  
Radical Ions

The Model for Calculation the Hall Effect Parameter

2004 ◽  
Vol 9 (2) ◽  
pp. 129-138
Author(s):  
J. Kleiza ◽  
V. Kleiza
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Mapping Method ◽  
Sample Thickness ◽  
System Of Nonlinear Equations ◽  
Specific Resistivity ◽  
Conformal Mapping Method ◽  
Effect Parameter ◽  
The Magnetic Field

A method for calculating the values of specific resistivity ρ as well as the product µHB of the Hall mobility and magnetic induction on a conductive sample of an arbitrary geometric configuration with two arbitrary fitted current electrodes of nonzero length and has been proposed an grounded. During the experiment, under the constant value U of voltage and in the absence of the magnetic field effect (B = 0) on the sample, the current intensities I(0), IE(0) are measured as well as the mentioned parameters under the effect of magnetic fields B1, B2 (B1 ≠ B2), i.e.: IE(β(i)), I(β(i)), i = 1, 2. It has been proved that under the constant difference of potentials U and sample thickness d, the parameters I(0), IE(0) and IE(β(i)), I(β(i)), i = 1, 2 uniquely determines the values of the product µHB and specific resistivity ρ of the sample. Basing on the conformal mapping method and Hall’s tensor properties, a relation (a system of nonlinear equations) between the above mentioned quantities has been found.

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