查询词典 photoionization

The photoionization cross sections of Al Ⅶ are calculated from the first ionization threshold to the K shell.

由得到的光电离截面，确定了一些自电离态的共振能量和宽度，结果表明，内壳层激发态的自电离宽度较大。

The gas is heated by photoionization.

气体是由光致电离加热的。

The double ionization energies of molecules are determined with photoionization efficiency spectroscopy.

不仅扩充了原有Rydberg系列和振动序列，而且探索性地指认了新的序列。

Data acquisition ; photoionization signal ; signal detection ; AT89C52

数据采集；光离子化信号；信号检测； AT89C52

The 400nm femtosecond laser photoionization and dissociation of pyridine-(water 〓 cluster was studied.

在吡啶-水团簇的质谱中同样看到了在纳秒激光下看不到的非质子化产物〓。

The threshold of lithium tantalite under single-shot is found to be 1.84J /cm 2 and the avalanche rate was determined to be 1.01 cm 2 /J by calculation. We found that avalanche dominates the ablation process, while photoionization serves as a free electron provider.

在800nm飞秒激光脉冲作用下，钽酸锂晶体单脉冲烧蚀阈值为1.84 J /cm 2；在此基础上，我们通过建立钽酸锂晶体中导带电子密度演化微分方程，并数值求解，得到了钽酸锂的碰撞电离速率系数为1.01 cm 2 /J ，并得出在钽酸锂表面烧蚀中，光致电离提供种子电子，雪崩电离起主导作用的结论。

This dissertation includes two parts. The first part deals with study on gas-phase reactions of metal ions with ethanethiol molecule by using the laser ablation-molecular beam method and density functional calculations. The second part describes experimental and theoretical study on VUV photoionization of some molecules using synchrotron radiation.

本论文分两大部分，第一部分介绍利用激光溅射-分子束技术研究金属离子与乙硫醇的气相反应，并用密度泛函理论研究了反应形成的团簇离子的结构和特性；第二部分介绍一些分子的真空紫外同步辐射光电离，结合量化计算分析了实验结果。

Therefore, there're only single charged parent ions of the sample gas molecule under the condition of photons' irradiation effect, and no fragment ions produced. Consequently, the mass spectra obtained from photoionization is very simple, and the sample gas can be detected without preseparation.

样品气体分子在光子的照射作用下只产生单电荷母离子，不产生碎片离子，以该电离方式获得的质谱图非常简单，因此气体样品不需分离即可进行检测。

The basic conceptions, including adiabatic ionization energy, vertical ionization energy, superexcited states, photoionization cross section, Rydberg state of atomic and molecular, dissociation and predissociation are discussed in detail.

着重讨论了同步辐射真空紫外光在原子分子研究领域中的应用，详细讨论了光与物质相互作用的一些基本概念，包括绝热电离能、垂直电离能、超激发态、光电离截面、原子分子的Rydberg态及离解和预离解的定义及相关的背景知识。

A new method based on proportional-integral-derivative control is proposed to measure photoionization cross sections in GaN materials by analysis of release and recaptures carriers of deep centers by incident light.

在分析GaN中深能级中心与入射光子间相互作用的基础上，提出了一种基于PID proportional-integral-derivative）技术的深能级中心光离化截面的测试方法。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。