ESR investigations on gamma-ray irradiated 3-methyl nylon 3
Yükleniyor...
Dosyalar
Tarih
2008
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier B.V. All
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Electron spin resonance spectroscopy investigations on gamma irradiated 3-methyl nylon 3 (poly-3-methyl beta-alanine) are reported. The resonance spectra (recorded after the irradiation in nitrogen atmosphere has been stopped) have been attributed to the parallel and perpendicular components of a triplet line assigned to the delocalization of the uncoupled electron over an effective nuclear spin 1. It was suggested that this effective spin arises from the fast tunneling/rotation of a proton between two positions. The resonance spectra have been simulated with accuracy by using a simplified spin Hamiltonian and assuming Lorentzian-like resonance line shapes and axial asymmetry of the resonance line due to the trapping of free radicals in randomly oriented crystallites. The time evolution of free radicals in nitrogen atmosphere at room temperature has been analyzed. The decay kinetics of stable free radicals in 3-methyl nylon 3 (under inert atmosphere) has been investigated. It was shown that the radiation-induced radicals in inert atmosphere decay through a unimolecular reaction. (c) 2008 Elsevier B.V. All rights reserved.
Açıklama
14th International Conference on Radiation Effects in Insulators (REI-14) -- AUG 28-SEP 01, 2007 -- Univ Caen, Caen, FRANCE
Anahtar Kelimeler
3-Methyl Nylon 3, Radiation-induced Modification, Radical Decay, Electron Spin Resonance, Oxygen
Kaynak
Nuclear Instruments & Methods In Physics Research Section B-Beam Interactions With Materials And Atoms
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
266
Sayı
12-13
