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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Exciton-Driven Highly Hyperthermal O-Atom Desorption from Nanostructured CaO
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Exciton-Driven Highly Hyperthermal O-Atom Desorption from Nanostructured CaO

机译：激子驱动的高度高温O-原子从纳米结构CaO上的解吸

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摘要

We report qualitatively new highly hyperthermal (HHT) oxygen atom emission from nanostructured CaO excited by 6.4 eV nanosecond laser pulses. The kinetic energy distribution of emitted O-atoms peaks at 0.7 eV, which is over 4 times greater than previously observed. Excitation of MgO and CaO nanostructures with UV laser pulses is known to result in thermal and hyperthermal emission of oxygen atoms when photons with energies above and below the band gap, respectively, are used. The highly energetic atomic desorption we observe, following bulk excitation, challenges the conventional view that bulk excitation can only induce thermal desorption. Using density functional theory and an embedded cluster method, we propose a mechanism for this HHT feature based on the interaction of surface holes with bulk excitons. These experimental and theoretical results suggest that specific atomic desorption mechanisms in wide-bandgap materials can be controlled by selective electronic excitation of not only the surface but also the bulk of these materials.
机译：我们从定性的角度报告了由6.4 eV纳秒激光脉冲激发的纳米结构CaO发出的新的高度高温（HHT）氧原子。发射的O原子的动能分布在0.7 eV达到峰值，比以前观察到的大4倍以上。已知当分别使用能量在带隙以上和以下的光子时，用UV激光脉冲激发MgO和CaO纳米结构会导致氧原子的热发射和超热发射。在整体激发之后，我们观察到的高能原子脱附挑战了传统的观点，即整体激发只能引起热脱附。利用密度泛函理论和嵌入式聚类方法，我们基于表面空穴与本体激子的相互作用，提出了一种用于HHT特征的机制。这些实验和理论结果表明，宽带隙材料中特定的原子解吸机理不仅可以通过选择性电子激发表面而且可以通过选择性地激发这些材料的大部分来控制。

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