通过表面二次谐波产生监测铀酰阳离子在金红石（001）单晶上的吸附。

Sorption of uranyl cations on a rutile (001) single crystal monitored by surface second-harmonic generation.

作者信息

Dossot Manuel, Cremel Sébastien, Vandenborre Johan, Grausem Jérôme, Humbert Bernard, Drot Romuald, Simoni Eric

机构信息

Laboratoire de Chimie Physique et Microbiologie pour l'Environnement LCPME, UMR CNRS-UHP 7564, F-54600 Villers-Les-Nancy, France.

出版信息

Langmuir. 2006 Jan 3;22(1):140-7. doi: 10.1021/la0519913.

DOI:10.1021/la0519913

PMID:16378412

Abstract

The rotational anisotropy of second-harmonic generation at the surface of a (001) single-crystal rutile is obtained in the presence of uranyl cations sorbed at the surface from acidic solutions at various concentrations. Surface second-harmonic generation appears to be sensitive to the presence of uranyl cations on the rutile samples. Evolution of the anisotropy pattern with initial uranyl concentration is analyzed through a phenomenological model. The elements obtained for the nonlinear susceptibility tensor Chi(2) for each sample significantly constrain the geometry of the possible sorption complexes between uranyl cations and rutile and lead to the proposition of two sorption sites involving different oxygen atoms of the rutile surface.

摘要

在(001)单晶金红石表面，通过从不同浓度酸性溶液中吸附在表面的铀酰阳离子，获得了二次谐波产生的旋转各向异性。表面二次谐波产生似乎对金红石样品上铀酰阳离子的存在敏感。通过一个唯象模型分析了各向异性模式随初始铀酰浓度的演变。为每个样品获得的非线性极化率张量χ(2)的元素显著限制了铀酰阳离子与金红石之间可能的吸附络合物的几何结构，并提出了涉及金红石表面不同氧原子的两个吸附位点。