A NEW TRANSITION BRANCH OF THE 5.2 SEC ISOMER IN 183W

During the bombardment of 14.8MeV neutron on natural wolfram samples a γ-ray with energy 291.7keV and halflife 5.17±0.03 sec is observed. From the experimental facts it is assumed that in addition to the two well known transition branches from the decay of 5.2 sec isomer in ¹³⁸W there exists another 11/2⁺11/2[615]→5/2^－3/2[512] isomeric (E3) transition. The hindrance factor of this new transition is calculated. It is well cosistent with the general empirical rule of k^－ forbidden isomeric transition.     

掺V4+的KTiOPO4单晶的电子顺磁共振研究

在室温X波段对掺V⁴⁺的KTP单晶作电子顺磁共振(EPR)谱的测量和分析表明:V⁴⁺占据的晶位可分为结晶学上不同的两类,每一类又含4个磁性不等价而结晶学上相同的V⁴⁺晶位。测量了3个互相垂直结晶主平面上的EPR超精细线随角度的变化,并用严格的最小二乘法拟合程序,确定了g和A张量的主值以及它们主轴的方向余弦。从而揭示了V⁴⁺是处在带有四角畸变的八面体环境及单胞中所有8个磁性不等价V⁴⁺晶位的空间取向     

聚苯乙烯芪盐L—B膜的二阶非线性光学性质研究

首次合成了一种称之为聚苯乙烯芪盐的有机高分子材料.此材料可以在水面上形成稳定的单分子层膜,并且所形成的单分子层膜可以转移到固体衬底上去.对聚苯乙烯芪盐单分子层膜进行光学二次谐波产生测量,得到聚苯乙烯芪盐对应于每个发色团的二阶非线性极化率为1.2×10~(-28)esu.制备了该材料两种不同类型的多层膜,讨论了多层膜二次谐波产生信号不随层数增加而增加的可能原因.     

STUDY ON PREPARATION OF UV CROSS-LINKING FILMS OF POLYURETHANE-LiClO4 COMPLEXES AND THEIR IONIC CONDUCTIVITY

The complexes of polyurethane containing double bonds with LiClO₄ were formed, and cross-linked films were produced by UV radiation, All of the films were uniform, transparent, flexible and smooth-faced with a considerable mechanical strength. The ionic conductivities of the films of several series of polymers with different molecule weights of PEG segment were measured, of which the highest is 8.09×10^-5S·cm^-1 at 300K under anhydrous atmosphere. Also the conductivity is deeply influenced by the molecule weight of the soft segment PEG of the polyurethane and the content of LiClO₄. The transport number of Li⁺ is about 0.57. Structure characteristic measurement much as DSC, XRD, IR etc., have been done and the conductive mechanism is discussed.     

非等强度,等脉冲相关技术测量甲酚紫染料的吸收恢复时间

利用非等强度、等脉冲相关技术测量甲酚紫染料吸收恢复时间。实验结果给出了甲酚紫染料吸收恢复时间为158ps。     

利用光热偏转技术实施光学薄膜弱吸收的多波长测量

介绍了光热表面形变光束偏转技术用于测量光学薄膜弱吸收的基本原理,简述多波长吸收测量装置的建立和测试过程,最后给出简单的测量实例.     

双路可编程光学多重成像并行二值逻辑处理器

基于多重成像原理，在本文中提出一种光学并行图像逻辑处理系统。对输入图案用两个正像和两个补偿进行编码。通过光调制器控制，可以实现逻辑操作的实时可编程。而且，该系统可以通过控制一组四个偏振片的状态实现独立的双输出逻辑通道，每一个输出通道各有十六种逻辑功能。文中也给出了实验结果。     

均匀磁场中带电粒子运动的双波描述

用双波量子理论描述带电粒子在均匀磁场中的运动,得到对单个粒子运动状况的完全描述。在任何时刻都能说出任一力学量的确切数值。通常量子力学中的概率性和平均值公式来源于双波描述对某类系综的平均结果。量子力学中的规范变换特性也能由系综平均看出。 关键词：     

Multi-Pion Correlations in Two-Pion Interferometry

The influence of multi-pion correlations on two-pion interferometry analysis in multi-pion events can be expressed as the ratio of a multi pion correlation factor for the sample of like-pion pairs to a residual correlation factor for the reference sample.Although these two correlation factors can be partially cancelled our in data analyses,the difference between these two factors in the low relative momentum region is so large that the distortion on the analysed results of two-pion interferometry from multi-pion interference becomes a serious problem when the pion source has a small radius and the pion multiplicity of event is high.The distributions of multi-pion correlation factor C_n－2(q) can sensitively reflect the multi-pion correlation effects in the events The analyses of multi-pion correlation factor for two Bevalac streamer chamber data samples of 2.1AGeV Ne+Pb and 1.8AGeV Ar+Pb collisions show that the multi-pion correlation effect in the former data sample is greater that in the latter.     

驻波场中原子的跃迁速率与所受辐射压力的关系

从二能级原子的密度矩阵运动方程出发,研究了原子在驻波场中的受激吸收速率、受激辐射速率和辐射压力的对应关系,提出了在驻波场中原子所受的辐射压力由受激吸收力和受激辐射力构成。此观点可以推广至N个行波场和原子相互作用的情况。