ESR Studies on the Linewidth Temperature Variation of C0_2 Radicals in Carbonated Apatite and Calcium Carbonates

スポンサーリンク

概要

• 論文の詳細を見る

• The isotropic ESR dating species at g = 2.0007, produced by ionizing radiation in synthetic and biological carbonated apatites and calcium carbonates, is attributed to rapidly tumbling C0^-_2 radicals. In this paper experiments on ESR linewidth variation with temperature were caried out in order to study the rotational properties of these radicals in B type carbonated apatite and calcium carbonates. The experimental data were fitted with Dattagupta and Blume and Ayant et al. analytical models developed for radicals rotating in crystal lattice sites and in viscous media, respectively. It was verified that the viscous medium formalism gives a better description of the rotational dynamics of the radicals. Exchange interactions were found to play an important role on the C0^-_2 motional relaxation, besides the contributions from spin-rotational and motional g-tensor modulation relaxations. These results also reinforce the hypothesis that the radicals are surrounded by water molecules.

• 社団法人応用物理学会の論文
• 1997-02-15

著者

• SCHRAMM Delson

  Centro Brasileiro de Pesquisas Flsicas, Rua Xavier Sigaud

• ROSSI Alexandre

  Centro Brasileiro de Pesquisas Fisicas, Rua Xavier Sigaud

• Schramm Delson

  Centro Brasileiro De Pesquisas

• ROSSI Alexauadre

  Centro Brasileiro de Pesquisas

関連論文

• Electron Spin Resonance, Electron-Nuclear Double Resonance and General Triple Resonance Studies on the Contributions to Line Broadening of CO^-_2 in A-type Carbonated Apatites and Biocarbonates
• ESR Studies on the Linewidth Temperature Variation of C0_2 Radicals in Carbonated Apatite and Calcium Carbonates

スポンサーリンク