Radiothermoluminescence and Transitions in Polymers |
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Page 49
... 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 50
... 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 52
... quenching process . Combining Eqs . ( 3.43 ) - ( 3.45 ) , the phosphorescence quantum efficiency becomes qp = kp / [ ( kn ) o + k , + e 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 qp = kp / [ ( kn ) o + k , + e exp ( − W / kT ) ] ( 3.46 ) Replacing quantum efficiency with the luminescence constant ar at ...
Contents
Preface | 5 |
Application of Radiothermoluminescence to the Study | 6 |
1 | 11 |
Copyright | |
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Common terms and phrases
absorption activation energy amorphous annealing atactic atoms bleaching blend changes charge Charlesby Chem chemical chemically trapped components concentration constant copolymer cross-linking crystal crystalline decay decrease depends dielectric dipoles distribution dose effect electron affinity electron traps electron-spin resonance emission entropy equilibrium excited molecules excited singlet first-order fluorescence free radicals free volume frequency factor glass glass-transition temperature glow curve glow peak increase INTENSITY relative units interaction interfacial intersystem crossing interzonal ionization irradiation isothermal kinetic light linear low temperatures luminescence luminescence centers LUMINESCENCE INTENSITY relative Macromolecules material maxima maximum mechanical method molecular motion molecules Nikolskii nuclear magnetic resonance observed occur oxygen phase phosphorescence Phys polar polybutadiene polyethylene samples polymer polypropylene quenching radiation radiothermoluminescence reactions recombination region relaxation transitions secondary relaxation semicrystalline Solprene spectra spectroscopy spectrum structure thermal thermodynamic thermoluminescence thermoluminescence intensity thermoluminescence peaks tion transition temperature trapped electrons triplet untrapping vibrational vulcanization whereas
References to this book
Polymer Surfaces and Interfaces II, Volume 2 W. J. Feast,H. S. Munro,R. W. Richards Snippet view - 1993 |