计算机网络在物理教学中的应用

 计算机网络教学是利用Internet通过WWW技术实现的。课程内容以HTML语言编写、以主页形式存储在服务器上,学习者使用Web浏览器通过Internet远程访问主页并选择相应的学习内容。网络课程是存储于WWW服务器上,集文本、声音、图像、视频信息等于一体的教学软件。课程内容以超文本形式链接在一起,由WebServer统一管理和发送,用户通过WebClient以HTTP协议向Server发出请求,并接收和显示Server提供Web信息。随着当代信息技术的蓬勃发展和因特网的出现而诞生的网络教学,为中国教育的跨越式发展提供了良好的机遇。     

SiS低激发态势能曲线和光谱性质的全电子组态相互作用方法研究

基于全电子的相关一致极化4-ζ(aug-cc-pwCVQZ-DK)基组,采用高精度的多参考组态相互作用方法计算了SiS自由基与最低的解离极限Si(3Pg)+S(3Pg)对应的18个Λ-S电子态的势能曲线.计算中考虑了标量相对论效应以及Si(2s22p6)和S(2s22p6)内壳层电子产生的关联效应.基于计算的势能曲线,拟合出了束缚态的光谱参数,包括平衡核间距Re,绝热激发能Te,振动常数ωe和ωeχe,平衡转动常数Be;并分析了束缚态在不同键长位置处的电子组态.计算了18个Λ-S态的电偶极矩函数,阐明了电子态的组态变化对电偶极矩的影响.给出了包含b3Π和A1Π态的自旋-轨道矩阵元随核间距变化的曲线,分析了邻近的电子激发态对b3Π和A1Π态的扰动.计算了A1Π—X1Σ+和E1Σ+—X1Σ+跃迁的跃迁偶极矩和Franck-Condon因子,讨论了A1Π和E1Σ+的最低五个振动能级的辐射寿命.     

高亮度LED在光学实验中的应用

通过介绍高亮度LED的特点，阐述它在光学实验仪器领域中的应用前景。     

Configuration interaction studies on the spectroscopic properties of PbO including spin-orbit coupling

Lead oxide(Pb O), which plays the key roles in a range of research fields, has received a great deal of attention. Owing to the large density of electronic states and heavy atom Pb including in Pb O, the excited states of the molecule have not been well studied. In this work, high level multireference configuration interaction calculations on the low-lying states of Pb O have been carried out by utilizing the relativistic effective core potential. The effects of the core-valence correlation correction, the Davidson modification, and the spin–orbital coupling on the electronic structure of the Pb O molecule are estimated. The potential energy curves of 18 Λ-S states correlated to the lowest dissociation limit(Pb(~3P_g) + O(~3P_g)) are reported. The calculated spectroscopic parameters of the electronic states below 30000 cm~(-1), for instance, X~1Σ~+, 1~3Σ~+,and 1~3Σ~-, and their spin–orbit coupling interaction, are compared with the experimental results, and good agreements are derived. The dipole moments of the 18 Λ-S states are computed with the configuration interaction method, and the calculated dipole moments of X~1Σ~+and 1~3Σ~+are consistent with the previous experimental results. The transition dipole moments from 1~1Π, 2~1Π, and 2~Σ to X~1Σ~+and other singlet excited states are estimated. The radiative lifetime of several low-lying vibrational levels of 1~1Π, 2~1Π, and 2~1Σ~+ states are evaluated.     

椭圆形平面镜的高精度面形重构技术

为了实现大口径椭圆形光学平面镜的高精度面形测量,提升大口径望远镜系统的像质,本文对椭圆形平面反射镜面形的绝对检测算法进行了研究。首先,对椭圆形镜面进行了多项式正交化拟合研究。接着,对绝对检测算法进行了理论研究,利用正交化绝对检测算法可以有效分离参考镜与待测镜的面形误差,从而实现待测椭圆形平面镜面的高精度面形重构。为了证明上述方法的实际检测精度,本文对250 mm×300 mm的椭圆形镜面进行了绝对检测模拟与检测实验。对参考镜面形精度不高的情况进行了仿真计算,实验中利用光阑在Zygo300 mm口径标准平面镜头中选取250 mm×300 mm椭圆形检测区域,采用150 mm口径Zygo干涉仪对上述椭圆形区域完成绝对检测,并基于上述正交化绝对检测算法对椭圆形平面镜实现了面形重构。实验结果表明,利用本文所述方法可以实现参考镜与椭圆形待测镜面的面形误差分离,绝对检测结果的残差图RMS(Root-mean square)值为0.29 nm,证明了本文所述方法的可行性。利用上述方法可以实现椭圆形平面反射镜的高精度面形重构。