Radiothermoluminescence and Transitions in Polymers |
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Page 45
... quenching a stage further by irradiating polyethylene at 4 K , warming it to 180 K , quenching it back to 4 K , and then bleaching with visible light . On subsequent warming , some lumi- nescence did appear in the 4–180 K range , which ...
... quenching a stage further by irradiating polyethylene at 4 K , warming it to 180 K , quenching it back to 4 K , and then bleaching with visible light . On subsequent warming , some lumi- nescence did appear in the 4–180 K range , which ...
Page 46
... Quenching As a general rule , luminescence increases in efficiency as the motion of a molecule is restricted , since the competing processes of radiationless energy transfer require coupling between the excited molecule and the ...
... Quenching As a general rule , luminescence increases in efficiency as the motion of a molecule is restricted , since the competing processes of radiationless energy transfer require coupling between the excited molecule and the ...
Page 48
... quenching process . Combining Eqs . ( 3.43 ) – ( 3.45 ) , the phosphorescence quantum efficiency becomes . ¶p = kp / [ ( kn ) o + kp + € exp ( − W / kT ) ] ( 3.46 ) Replacing quantum efficiency with the luminescence constant ar at ...
... quenching process . Combining Eqs . ( 3.43 ) – ( 3.45 ) , the phosphorescence quantum efficiency becomes . ¶p = kp / [ ( kn ) o + kp + € exp ( − W / kT ) ] ( 3.46 ) Replacing quantum efficiency with the luminescence constant ar at ...
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Common terms and phrases
activation energy annealing atactic atoms blend changes charge Charlesby Chem chemical cis-polybutadiene components concentration constant cooling copolymer cross-linking crystal decay decrease density depends dielectric distribution dose E/kT electron affinity electron traps emission entropy equilibrium evaluation excited molecules factor first-order fluorescence fraction free volume frequency frequency factor glass glass-transition temperature glow curve glow peak grafting heating increase INTENSITY relative units interaction interfacial intersystem crossing interzonal ionization irradiation isotactic kinetic linear low-temperature luminescence centers LUMINESCENCE INTENSITY relative Macromolecules material maxima maximum mechanical melting method molecular motion molecules Nikolskii nuclear magnetic resonance observed occur oxygen phase phosphorescence Phys polybutadiene polyethylene samples polyisobutylene polypropylene polystyrene position quenching radiation radicals radiothermoluminescence reaction recombination relaxation transitions room temperature secondary relaxation semicrystalline semicrystalline polymers spectra spectroscopy structure temperature thermal thermodynamic thermoluminescence thermoluminescence peaks tion transition temperature trapped electrons untrapping vibrational vinyl vulcanization whereas Zlatkevich
References to this book
Polymer Surfaces and Interfaces II, Volume 2 W. J. Feast,H. S. Munro,R. W. Richards Snippet view - 1993 |