Search Results

You are looking at 1 - 4 of 4 items for

  • Author or Editor: L. Bugaenko x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract  

The ESR method was used to study the regularities of formation of silver atoms in gamma-irradiated aluminium silicate modified by yttrium and containing109Ag istope ions introduced by various techniques. The existence of two types of silver atoms and an Ag 2 1 complex stabilized an the surface of a gamma-irradiated carrier has been established. g-Factors and superfine structure constants of spectral lines of paramagnetic silver particles belonging to various types observed on the surface have been calculated. Quantitative correlations of paramagnetic silver particles and the nature of their kinetic dependences in a broad temperature range (from 77 to 353 K) are determined by the number of silver ions introduced into the carrier and by the mode of introduction, thermal and vacuum pretreatment of the samples, irradiation dose and the temperature of investigating the gamma-irradiated surface.

Restricted access

Abstract  

ESR technique was used to study the effect of conditions chosen to prepare samples to obtain and stabilize silver atoms forming under the action of60Co -irradiation at 77 K in aluminium silicate modified by nickel and containing silver ions. The use of109Ag isotope made it possible to detect two types of silver atoms AgI and AgII in -irradiated aluminium silicate modified by nickel and containing silver ions introduced by various techniques. The parameters of the ESR-spectrum of the silver particles under study have been determined and their thermal stability has been investigated.

Restricted access

Abstract  

ESR spectra for -irradiated, at –196 °C, solution of Me2NH, Me3N, and EtNH2 in CFCl3 /0.05÷100% amine/ have been studied. Radical cations Me2NH+., Me3N+. and EtNH 2 +. were trapped in dilute solutions /less than 1% amine in CFCl3/. The yields of radical cations decrease and those of neutral radicals /Me2 N, CH2NMe2, Et NH/ correspondingly increase as the amine concentration increases. Radical cations Me2NH+. are transformed to Me2 N as well as Me3N+. to C H2NMe2 via proton transfer reaction, which is described by the reaction volume model.

Restricted access

Abstract  

ESR spectroscopy at 77 K has been used for the investigation of radicals formed in the low-temperature X-radiolysis of tri-n-butylphosphate /TBP/, di-n-butylphosphate /DBP/, di /2-ethylhexyl/phosphoric acid /DEHPA/, tri-p-tolylphosphate /TTP/, di-n-butyl-n-butylphosphonate /DBBPN/. Besides the phosphate radicals also hydrogen atom stabilization in the matrix has been observed. In the presence of oxygen peroxy radicals occur as well. The structure of the radicals and reaction mechanisms are discussed.

Restricted access