The numerical results show that with the increase of the height of quantum dat ( the barrier thickness), the exciton energy and electron-hole recombination rate are reduced and the quantum dot emission wavelength is increased.

The enhancement of photocatalytic activity results from suppressing the excited electron-hole pair recombination.

这种光催化的增强主要是由于光生电子空穴对的复合被抑制的结果。

At these extremely high frequencies, internal quantum-mechanical oscillations of the excitons themselves were excited.

在这种超高频的情况下，电子空穴的内部量子震荡会被激发出来。

However, rutile TiO2 under UV light was only good optical activity and photoinduced electrons and electronic-hole more likely to composite. Doping is a better means of changing the effective wavelength range of photoelectricity activity.

然而金红石相TiO2仅在紫外光条件下才具有良好的光电活性，且光生电子空穴对较易复合。

However, the combination speed of photogenerated electron-hole pairs was high, which restrains photocatalytic activity of individual semiconductor.

但是，单组份半导体的光生电子空穴对的结合速度非常迅速，这抑制了它们的光催化活性。

The PL intensity decreased with increasing of contents of Ag doping, suggesting that doped Ag inhibited recombination of photoinduced electrons and holes.

随着掺Ag量的增加，PL光谱强度下降，这说明Ag掺入抑制了光生电子空穴的复合。

Sherwin explained that when light of the correct frequency is incident on a quantum well, it creates bound electron-hole pairs called excitons and is absorbed.

舍温解释说，当频率合适的光线附到一个量子井上时，它会创造出一对叫做“电子空穴对”的电子束缚洞，而光线会被其所吸收。

The efficiency of electron-cavity separated is increased.

电子空穴分离效率提高；

The semiconductor as a photocatalyst can absorb solar energy to generate photoinduced electron-hole pairs with powerful redox ability. Through a series of degradation reactions initiated by electrons and holes, the gaseous pollutants can be decomposed into harmless carbon dioxide and water.

光催化技术的基本原理是，半导体光催化剂吸收太阳能，产生具有氧化还原活性的电子空穴对，进而通过一系列分解反应将有机污染物降解为无毒无害的二氧化碳和水。

We point out that the equation can be approximated by a set of linear ones and the exciton polarization wave can be regarded as a Bose field only in the limit of low excitation.

我们指出只有在激发比较弱时，这组方程才可近似为一组线性方程，电子空穴极化波才可以看作玻色场。

However, when reached to a certain thickness, the probability of electron-hole recombination increased, so the photocurrent decreased with the increase of thickness.

但达到一定厚度后，电子空穴复合的几率增加，光电流开始随膜厚的增大而逐渐减小。

For controlling the directional movement of electrons and holes and prolonging the life-span of the surface holes, WO_3 was doped in TiO_2 film.

为了控制电子空穴的定向流动，提高表面空穴的寿命，从而改善薄膜的光诱导亲水性，我们将WO3掺入TiO2薄膜中。

After considering the interaction between electrons, the problem of a semiconductor interacting with light is discussed and the equation of exciton polarization wave excited by light wave is obtained.

考虑到电子空穴间的相互作用，我们讨论了光波与半导体的相互作用，得到了描述光激发电子空穴极化波的方程。

Like what did in the second chapter, the energy is computed when the interaction between electron and hole is regardless.

如同第三章一样，我们同时也对不考虑电子空穴相互作用时的激子的能量进行了计算。

However, organic solar cells based on carbon nanotubes is the carbon nanotubes powder and organic materials blends, the combination between carbon nanotubes is weak, resulting in greater resistance and high electron hole on the composite, making the efficiency of the solar cell is low.

然而，基于碳纳米管的有机太阳能电池是将粉末状的碳纳米管与有机材料共混，碳纳米管之间的结合较弱，因此导致较大的电阻且电子空穴对容易发生复合，使得太阳能电池的效率很低。

EPR analysis shows the reasons may be in UV light the material of titanium dioxide may produces electron hole, but the active state of the electron hole is easy to decline, in a short time it can be attenuated to the level before irradiation.

EPR分析可知原因可能是材料中的二氧化钛在紫外线照射下产生电子空穴，但是这种处于活性状态的电子空穴对能量容易衰减，在短时间内其反应活性即可衰减到照射前水平。

However, the large scale application of TiO2 thin film as mutual photocatalyst is hampered by the wide band-gap and higher recombination rate of photo-generated electrons and holes.

但是，Ti02禁带宽度大，在紫外光区具有高响应和高的电子空穴复合率，其广泛应用受到了限制。

In order to research the properties of exciton better, we also compute the energy when the interaction between electron and hole is regardless.

为了更好的研究量子点内激子的性质，我们把不考虑电子空穴相互作用时的基态能量，一并做了计算。

Optical-model Approach for Positronium Formation in Positron Scattering from H and Na Atoms

光学势方法研究正电子与H，Na碰撞中电子偶素形成通道

Production of vacuum positronium atoms

真空电子偶素原子的产生

If the spins are in the same direction, the state is called orthopositronium; if they are opposite, we speak of parapositronium. Let's get Back to our main subject.

若方向相同，则称该自旋态的电子偶素为正电子偶素；若方向相反，则称为仲电子偶素。我们言归正题/言归正传。