Additive coloring of thin, single crystalline MgO(001) films

被引：8

作者：

Gonchar, Anastasia ^{[1
]}

Risse, Thomas ^{[1
]}

Giamello, Elio ^{[2
]}

Freund, Hans-Joachim ^{[1
]}

机构：

[1] Fritz Haber Inst MPG, Dept Chem Phys, D-14195 Berlin, Germany

[2] Univ Turin, Dipartimento Chim Inorgan Chim Fis & Chim Mat, I-10125 Turin, Italy

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2010年 / 12卷 / 39期

关键词：

ALKALINE EARTH OXIDES; TEMPERATURE-PROGRAMMED DESORPTION; MAGNESIUM-OXIDE; DEFECT CENTERS; MGO SURFACES; PHOTOELECTRON-SPECTROSCOPY; CO; CLUSTERS; OXYGEN; CHEMISORPTION;

D O I：

10.1039/c0cp00197j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electron bombardment of single-crystalline MgO(001) films has been shown to result in the formation of surface color centers. In this report we present an alternative way to produce surface color centers on single-crystalline MgO(001) films using additive Mg coloring. Electron paramagnetic resonance (EPR) spectroscopy was used to prove the formation of surface paramagnetic color centers upon deposition of small amounts of Mg on MgO(001) films at 50 K. With increasing coverage the number of Mg induced color centers rises up to a coverage of about 0.03 monolayers and thereafter decreases with increasing Mg coverage. At high coverage and low temperatures metallic Mg clusters nucleate on the surface of the MgO(001) film as shown by infrared (IR) spectroscopy using CO as a probe molecule.

引用

页码：12520 / 12524

页数：5

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