NH2偶极矩的量化计算及多元线性回归的解析处理

采用GAUSSIAN98程序计算了NH2的基态的偶极矩面，采用多元线性回归 的拟合方法，由各项的线性相关性和标准偏差确定各项的取舍，得到具有合理标准偏 差的简单解析偶极矩幂级数表达式。     

不等式证明的概率方法

运用概率论中的Jensen不等式,并且适当地构造随机变量的方法证明不等式,使得不等式的证明变得简单、清晰,同时使得不等式具有某种概率统计意义.     

塞曼效应在Cl2+及其同位素分子离子

利用光外差磁旋转速度调制光谱技术获得了可见光波段(16820～17350cm-1)Cl2+分子离子的A2Πu-X2Πg电子跃迁吸收光谱.在标识Cl2+及其同位素分子离子谱带的过程中,应用塞曼效应,准确指认了属于Ω=1/2子带系的三个子带.它们分别是35Cl2+和35Cl37Cl+的(3,7)带的Ω=1/2子带以及35Cl2+的(2,7)带的Ω=1/2子带.其标识结果扩展了Cl2+分子离子的基态和激发态能级的振动标识范围,使各谱带的转动分析得以顺利进行,并获得了新的Cl2+分子常数.     

Orientation of KRb molecules in a switched electrostatic field

We theoretically investigate the orientation of the cold KRb molecules induced in a switched electrostatic field by numerically solving the full time-dependent Schrdinger equation. The results show that the periodic field-free molecular orientation can be realized for the KRb molecules by rapidly switching off the electrostatic field. Meanwhile, by varying the switching times of the electrostatic field, the adiabatic and nonadiabatic interactions of the molecules with the applied field can be realized. Moreover, the influences of the electrostatic field strength and the rotational temperature to the degree of the molecular orientation are studied. The investigations show that increasing the electrostatic field will increase the degree of the molecular orientation, both in the constant-field regime and in the field-free regime, while the increasing of the rotational temperature of the cold molecules will greatly decrease the degree of the molecular orientation.     

激光锁定F-P腔频率的有差锁定研究

基于有差伺服调节技术,实现了外置光学谐振腔的共振频率与钛宝石激光器工作频率的锁定.该技术采用压电陶瓷作为执行元件,通过对压电陶瓷的调制,实现了对透射激光功率的调制,并由锁相放大器解调获得伺服信号,该伺服信号经过高压放大器放大后控制压电陶瓷的伸缩来调控谐振腔的腔长,从而使腔的共振频率锁定在激光频率上.当激光上作于单一频毕时,谐振腔的谐振频率可以长时间地与激光频率保持锁定,锁定后腔的透射光功率相对起伏的稳定性为2%.当激光频率扫描时.谐振腔的谐振频率可以在2 GHz范围内不间断地与激光频率保持锁定.     

一种新型的分子离子吸收光谱技术

将频率调制和磁旋转 技术应用于速度调制激光光谱技术中,形成一种全新的具有高灵敏度的分子离子光谱测量技术,它不仅保留了速度调制光谱技术掏中性分子吸收信号的特点,同时使噪声达到散粒噪声的测量极限。     

CN红带A 2Пi-X 2Σ+(6, 1)和(7, 2)带振转光谱研究

通过微量CH3CN(36 Pa)与He(660 Pa)混合气体交流Penning辉光放电获得CN自由基分子, 采用光外差-磁旋转-浓度调制光谱技术, 在可见光波段16 850～17 480 cm-1进行了转动分辨光谱测量, 分别标识了CN分子红带A 2Пi-X 2Σ+(6, 1)和(7, 2)138条和118条的转动光谱(其余光谱为C2自由基及CN红带(8, 3)带光谱). 理论拟合分子常数时考虑电子态间的微扰作用, 采用有效哈密顿量矩阵对角化获得了A 2Пi(ν=6, 7)态更精确的分子常数及电子态A 2Пi(ν=7)与 X 2Σ+ (ν=11)之间的微扰常数ξ, η, 总体拟合方差均小于实验误差0.007 cm-1, 表明拟合结果是非常精确的.     

激光磁共振光谱方法的进展

本文介绍了激光滋共振光谱方法近几年来的新发展，其中包括实验系统的改进，以及采用磁旋转方法、双调制方法、双共振方法和时间分辨方法的激光磁共振新技术．用这些方法对许多自由基分子、离子分子和激发态分子作了测量，同时也介绍了它们的一些应用．     

Effects of Pumping Sizes on THz Radiation Based on Ultrashort Light Pulse Optical Rectification for High Spatial Resolution T-Ray Imaging

We present our experimental studies on the effects of the pumping sizes on THz radiation based on ultrashort light pulse optical rectification for high spatial resolution T-Ray imaging. Our experiments show that high spatial resolution T-ray imaging requires both thin THz emitter and sample, and rigorous tolerance of the gap between the sample and the emitter, as well as small pumping size which usually much smaller compared with THz wavelength. Such a small pumping size results in dramatic decrease of the THz wave power, which originates from strong diffraction of THz wave, the depolarization of the focused tightly pumping beam, the spatial filtering of the emitter exit-surface, and the strong phase-mismatching between the pumping and the high spatial Fourier components of the THz signal, rather than two-photon absorption.     

Isotopic Analysis to Determine All the Molecular Constants of O2^＋ in the A-X System

The linear correlated constants AD （centrifugal correction of the spin-orbit coupling constant） and γ （the spinrotation constant） involved in the second negative （A^2 Ⅱu-X^2 Ⅱg） system of O2^＋ are determined by nonlinear least-squares fitting the spectra of 16 O2^＋ and 18 0＋ using the isotopic effect. In addition, the molecular constants of the other O2^＋ isotopologues are predicted.