Negative Parity Bands and Signature Splitting Inversion in ^80Rb

High spin states in ^80Rb were studied via the ^65Cu ^19F, ^66Zn ^180 and ^68Zn ^160 reactions. The 75-MeV ^19F,76-MeV ^180 and 80-MeV ^160 beams were provided by the CIAE HI-13 Tandem accelerator and the JAERI Tandem accelerator. The prompt γ-γ coincidence and the directional correlation from oriented nuclei (DCO)were measured by the detector arrays in CIAE and JAERI. Twenty-three new states with 28 new transitionshave been assigned to ^80Rb. The states were observed up to spins of 20^ and 22^- in the α= 0 branch for thepositive and negative parity yrast bands respectively. The negative parity non-yrast bands were significantlyextended up to spins of 22^- and 15^-. The band crossings with frequencies 0.51 MeV and 0.61 MeV in the α= 0cascade were observed for the first time. The signature splitting was observed in both negative parity bands. Thesignature inversions at spins of about 7h and 15h were observed.     

氯化亚锡抑制吡啶分子表面增强拉曼光谱测定中的碳化现象

碳化是表面增强拉曼光谱中难以避免的干扰现象,特别是对于活性有机和生物分子的检测。作为一种最常用的探针分子,吡啶同样也存在碳化的问题。然而,作者发现通过引入SnCl2,可以有效地抑制表面增强拉曼光谱测定中吡啶分子的碳化现象。该方法操作简单,所引入的SnCl2只在谱图低波段处出现少而易区分的特征峰,不干扰被测样品的光谱分析。有别于文献中所采用的真空、惰性气氛、低温和低激光功率等物理方法,此法是解决碳化问题的一种崭新的化学方法,可望应用于其他易碳化的有机和生物分子的表面增强拉曼光谱检测。     

衍射光栅的第二类角色散及其特性分析

在由矢量衍射理论得到的锥面衍射情形下的广义光栅方程基础上，给出了对应于衍射极角的衍射光栅第一类角色散公式和对应于衍射方位角的衍射光栅第二类角色散公式，并通过理论和数值分析导出了第二类角色散发生突变的条件及相应的数学表达式. 关键词： 衍射光栅 锥面衍射 第一类角色散 第二类角色散     

Phase Synchronization as a Mechanism of Controlling Spatiotemporal Chaos via External Periodic Signal

We find that phase synchronization (PS) is a mechanism in which the spatiotemporal chaos (STC) can be suppressed to a spatially regular (SR) state by applying an external periodic signal in a one-dimensional driven drift-wave system.In the driving wave coordinate,the nonlinear system can be transformed to a set of coupled oscillators moving in a periodic potential.In this multi-dimensional system,the internal modes are slaved one by one through PS by the control signal.Two types of responses of the internal modes to the external periodic signal are observed.For some modes,the stabilization is through frequency-locking;while for the other modes,a special kind of PS without frequency-locking,namely multi-looping PS,is developed.     

氢化物发生原子荧光光谱法测定三七中的砷

采用硝酸、高氯酸混合酸消解试样 ,氢化物发生原子荧光光谱法测定三七中的砷 ,并对仪器的工作条件、盐酸、还原剂用量、共存元素的干扰进行了试验。方法的检出限为 7.4 ng· g-1;测定精密度为 4 .67%— 7.0 1 % ;回收率在 97%— 1 0 1 %之间     

Shears bands in 112In

A new level scheme of ¹¹²In have been established up to 6.8 MeV in excitation energy and to a tentative spin of (21⁺) through the reaction ¹¹⁰Pd(⁷Li,5n)¹¹²In at a beam energy of 50 MeV. In-beam measurements involving γ-γ coincidences and directional correlation of oriented states were performed. M1 bands consisting of ΔI=1 dipole transitions have been observed. Possible quasiparticle configurations suggest that these bands are similar to the shears bands observed in Pb nuclei.     

扫描隧道显微镜功能化针尖对分子能级的选择成像

文章提出了一种通过修饰STM针尖使其功能化，调节扫描隧道显微镜（STM）的扫描偏压范围，实现对分子能级的选择性成像的方法．二萘嵌苯分子在Ag（110）表面上自组织形成的有序单层膜主要是通过分子的π电子态成像，而被二萘嵌苯分子修饰的STM针尖的能级失配于基底上吸附的分子的能级，从而只对分子的部分能级成像．这个结果为有机界面电子输运测量提供了一种更好的能级选择方法．     

155Tm核的能级结构

通过重离子熔合蒸发反应¹⁴²Nd(¹⁹F, 6n)¹⁵⁵Tm来布居¹⁵⁵Tm核的高自旋态. 发现了一些新的γ跃迁, 经过γ-γ符合分析, 建立了新的能级纲图. 利用系统学比较对新建立的¹⁵⁵Tm能级进行了讨论.     

106Ag手征性实验研究

利用能量为60MeV的¹¹B束流, 通过¹⁰⁰Mo(¹¹B, 5n)¹⁰⁶Ag熔合蒸发反应布居¹⁰⁶Ag的高自旋态, 用15台带BGO反康的HPGe探测器进行在束γ谱学测量. 通过γ-γ符合矩阵开窗分析和DCO比值分析, 建立了¹⁰⁶Ag新的能级纲图, 观测到26条新γ跃迁. 与相邻同位素奇奇核¹⁰⁴Rh比较, ¹⁰⁶}Ag中带1和带2具有A≈100区手征二重带的3个特征, 推测它们可能是基于πg_9/2⊙υh_11/2组态的手征二重带. 但它们的角动量顺排不一致, 在实验上还需进一步的测量研究.     

电热原子吸收光谱法测定钢铁样品中的痕量钙

采用电热原子吸收光谱法测定了钢铁样品中的痕量钙,加标回收率为95.0％-110.0％,相对标准偏差在4.6％-6.4％之间,本法适用于那些不具备昂贵价格大型仪器的实验室,更适用于生产流程控制检测.