K_2(9~1∑~+_g)高位电子态与H_2碰撞中H_2的能量分布

光学-光学双共振激发K2到91∑+g高位态,研究了K2(91∑+g)与H2的电子-振转碰撞能量转移。利用相干反斯托克斯(CARS)光谱技术探测H2的振转态分布,扫描CARS谱表明H2在(1,1)、(2,1)、(2,2)、(3,1)、(3,2)、(3,3)和(3,5)能级上有布居。由时间分辨CARS轮廓得到H2各振转能级上粒子数之比,得到H2的平均振动能和平均转动能分别为9063cm-1和388cm-1。从91∑+g→11∑+u、11∑+u→11∑+g、33∏g→13∑+u跃迁的时间分辨激光感应荧光(LIF)强度得到它们的自发辐射率和碰撞转移率。在H2压强为3×103Pa时,K2(91∑+g)与H2的碰撞转移能为16930cm-1。H2的平均振转能占平均转移能的56%。     

基于红外光谱分析的新型物质分析算法及实验研究

提出了一种基于红外光谱分析技术的物质识别算法以解决定性、定量的进行红外光谱分析时所遇到的难题。通过将欧氏距离相似性判定和光谱分析传统方法的结合,完成了该算法的理论分析并开发了相应的物质分析软件。通过物质分析实验验证了该算法的可行性,实验结果表明该算法应用于测试混合物光谱分析时分析准确度优于96%。通过分析实验结果表明可知:该算法能够程序化地实现物质的现场快速检测,并保持很高的精确度,能够满足食品安全领域的光谱分析需求。     

荧光光谱法辨别丙二醇和二甘醇

以齐药二厂的假药事件为背景,对1,2-丙二醇、1,3-丙二醇和二甘醇的吸收光谱和荧光光谱进行了测量,实验结果证明光谱法不失为一种快捷有效的区分手段.在紫外吸收光谱中,可以通过最大吸光度的差异区分二甘醇和丙二醇;在一定紫外波长激励下,三种醇的荧光光谱特性均存在差异,以此可以对三种醇作出有效区分;在230nm激发下,将二甘醇和两种丙二醇分别混合,混合溶液的相对荧光强度均与两种丙二醇体积比呈线性反比关系,这在一定程度上证明了二甘醇的荧光量子效率大于两种丙二醇.     

Eu3+摩尔浓度对Y2O2S:Eu3+,Mg2+,Ti4+红色长余辉材料光谱的影响

用高温固相法制备了Y2O2S：Eu^3 ,Mg^2 ,Ti^4 红色长余辉材料。测量了该材料的余辉曲线,余辉时间为1h以上;由X射线衍射得到晶体结构为Y2O2S.测量了不同Eu^3 摩尔浓度下的激发光谱和发射光谱,得到从^5DJ(J=0,1,2,3)^-7FJ(J=0,1,2,3,4,5)的发射谱线,并得到位于260,345,468和540nm激发峰。由于激活剂饱和效应,Y2O2S：Eu^3 ,Mg^2 ,Ti^4 发射光谱中513．6,540．1,556．4,587．3和589．3nm属于从^5D2,^5D1到^7FJ(J=0,1,2,3,4)跃迁的发射峰随Eu^3 摩尔浓度的增加相对削弱;激发谱包括位于350nm左右属于电荷转移态吸收(Eu^3 -O^2-,Eu^3 -S^2 )的激发主峰和在可见光区位于468,520和540nm属于Eu^3 离子4f-4厂吸收的激发峰。随着Eu^3 摩尔浓度的增加,位于468,520和540nm的激发峰相对增强。     

Quantum Speed Limit of a Photon under Non-Markovian Dynamics

Quantum speed limit （QSL） time under noise has drawn considerable attention in real quantum computational processes. Though non-Markovian noise is found to be able to accelerate quantum evolution for a damped Jaynes-Cummings model, in this work we show that non-Markovianity will slow down the quantum evolution of an experimentally controllable photon system. As an application, QSL time of a photon can be controlled by regulating the relevant environment parameter properly, which nearly reaches the currently available photonic experimental technology.     

Numerical Simulation on the Production Mechanism of Surface-Wave Plasmas Sustained along a Metal Rod

For interpreting the production mechanism of surface-wave plasmas sustained along a metal rod, electromagnetic simulation on the electromagnetic field distributions and particle-in-cell/Monte Carlo collision （PIC/MCC） simulation of the ionization process are present. The results show that the enhanced electric field of surface plasmon polaritons （SPPs） can be excited in the ion sheath layer between the negative-voltage metal rod and the surface-wave plasmas, which is responsible for maintaining the plasma discharge. Moreover, the spatio-temporal evolutions of plasma density and electric fields are simulated by the PIC/MCC model. It is further suggested that the expanded ion sheath layer can extend the length of plasma domain by increasing the plasma absorbed energy from SPPs.     

紫外分光光度法测定肉制品中亚硝酸盐

在酸性条件下 ,亚硝酸盐与间苯二酚及锆氧离子反应生成有色螯合物 ,建立了一种简易快速的测定食品中微量亚硝酸盐的方法。优化了波长、酸度、显色剂用量、显色时间等实验条件 ,并由正交实验进一步验证。对猪肉、午餐肉、腊肠、香肠几种样品中的亚硝酸根离子进行测定 ,回收率达 90 %以上     

STUDY OF OPTICAL PUMPING OF ALKALI ATOMIC BEAM IN STRONG MAGNETIC FIELDS

We have gained a very comprehensive set of results for infrared diffraction (10.6μm wavelength) from fabricated single grooves of reflection with widths in the range of 5μm to 65μm. The experimental results show that the diffraction can still occur when the groove width becomes comparable to or less than the wavelength of the probing light. Variations of the diffraction intensities have a very regular sinusoidal relationship with the polarization angle of the incident light; and the diffraction intensities are the when the incident light is TM polarized. However, the diffraction intensities will be a minimum when the incident light is TE polarized; and the biger the diffraction angle, the higher the rate of change of the diffractive intensity with increasing polarization angle of the incident light.     

一种改善MVDR波束形成性能的方法

最小方差信号无畸变响应(MVDR)波束形成具有最佳的信号保护、干扰消除和噪声降低能力,即信号/(干扰+噪声)比增益最大,它的能量输出作为一种波数谱(方位)估计器,其估计精度或分辨力受着声场信噪比因素的限制。本文提出一种新的改进MVDR波束形成方位分辨力的方法,它可以调节这种波束形成器权向量中的增强因子(等价于改善声场的信噪比条件),从而改进其方位分辨能力,并且不以牺牲信号/(干扰+噪声)比增益为代价。     

Ti：LiNbO3光波导导模的场分布

给出了Ti扩散LiNbO_3条波导任意阶导模场分布的试探解.通过变分法分析,不但可以合理地确定其中的待定参数,而且也得到了相应导模传播常数的近似值.与扩展的有效折射率方法比较:这种解不但在函数形式上简单,待定常数确定方便,而且具有精度高的优点.还可以得到等效一维波导折射率分布的解析表达式.