在Ni片上制备YSZ/CeO2阻挡层和YBCO超导膜

本文用平面靶射频磁控溅射在具有双轴织构的Ni片上外延生长CeO2和YSZ薄膜作为阻挡层,X-射线衍射扫描分析表明CeO2和YSZ薄膜具有强的c轴织构和较好的平面内双轴织构.用中空柱状靶直流磁控溅射在阻挡层上制备YBCO超导薄膜.在2cm波带测量了YBCO的表面电阻和谐振腔有载QL值.     

土壤电化学性能对铀、锶、铯分配系数的影响及机理探讨

通过静态吸附实验研究了土壤pH值、正电荷AEC值、永久负电荷CECp值等电化学性能对核素铀、锶、铯分配系数的影响,进一步结合XRD物相分析结果,对土壤滞留核素的机理进行了探讨.研究结果表明:所研究的两种土质类型中,铀的分配系数(U-Kd值)均随溶液初始pH值的减小、AEC值的增大而增大;铯、锶的分配系数与土壤的CECp值、蒙脱石和伊利石总含量呈正相关关系;Cs 、Sr2 离子势及其相应水合离子半径的差异造成土壤中铯的分配系数显著大于锶的分配系数.     

Creation of an Ultracold Plasma by Photoionizing Laser-Cooled Caesium Atom

The signals of ultracold plasma are observed by two-photon ionization of laser-cooled atom in a caesium magneto-optical trap. A simple model has been introduced to explain the creation of plasma, and the mechanism is further investigated by changing the energy of a pulsed dye laser and the number of initial cooled atoms.     

Ba对Cs1-xBaxAlSi2O6地聚合物及其铯榴石陶瓷结构影响

以偏高岭土为原料,利用BaCl2取代部分CsOH·H2O制备了化学组成约为Cs1-xBaxAlSi2O6·nH2O的地聚合物.将Cs1-xBaxAlSi2O6·nH2O地聚合物在不同温度下烧结得到了Cs1-xBaxAlSi2O6铯榴石陶瓷.采用X射线衍射(XRD)、扫描电子显微镜(SEM)等手段研究了Cs1-xBaxAlSi2O6·nH2O地聚合物及其铯榴石陶瓷的晶体结构和微观形貌.研究结果表明:Ba掺量对Cs1-xBaxAlSi2O6·nH2O地聚合物及其铯榴石陶瓷结构有较大的影响.随着Ba掺量增加,CsCl盐晶体在地聚合物中析出,同时伴有铯榴石晶体生成.烧结制备的Cs1-xBaxAlSi2O6体系以铯榴石晶体为主,Ba可以取代Cs占据铯榴石晶体中Cs的晶格格点,但受Ba的掺入量和烧结温度影响.     

几种无定型聚芳醚砜(酮)的成环解聚及产物的开环聚合

几种线性高分子量的无定型聚芳醚砜(酮)在非质子极性溶剂二甲基乙酰胺(DMAc)和二甲基甲酰胺(DMF)中,以氟化铯(CsF)为催化剂进行解聚成环,所得环状低聚物由凝胶渗透色谱(GPC)、高效液相色谱(HPLC)和激光质谱(MALDI-TOF-MS)确认,其中酚酞聚醚砜(PES-C)和酚酞聚醚酮(PEK-C)的解聚成环率分别高达86．3％和87．9％．讨论了影响成环率的各种因素．环状产物又在阴离子引发剂联苯双酚钾的作用下进行开环聚合重新得到高分子量的线性产物．     

4(5),4′(5′)-二烷酰基二苯并-21-冠-7萃取铯的研究

核工业高放废液(HLW)的处理是环境科学中极受关注的课题,从中分离和回收137Cs是分离嬗变工艺的重要环节之一,且回收的137Cs是优良的辐射源,在各领域有着广泛用途[1-2].     

岭回归原子吸收光谱法同时测定铅和铯

本文用岭回归法校正了在火焰原子吸收光谱分析中铯２４７．６４３ｎｍ对铅２４７．６３８ｎｍ的吸收线重叠干扰,并用本法对混合样中铅和铯进行了测定,结果令人满意,可以认为岭回归可能是解决原子吸收谱线重叠干扰的一种方法。     

铯原子永久电偶极矩研究

从理论方面和实验方面论述,铯原子可能有大的永久电偶极矩。     

稀土元素对提铯离子筛交换性能的影响

对比了提铯离子筛对铯离子与分部稀土元素的交换容量和分配系数;了钕离子对提铯离子交换性能的影响,以及稀土元素存在对提铯离子筛在高效废液中选择性的影响。稀土元素对提铯离子筛的铯离子交换容量有一定的影响,但对铯离子分配系数影响不大;只要选择合适的液固比V：m,基本上可以消除稀土元素的存在对提铯离子筛在高放废液中铯离子选择性的影响。     

Optical pumping and population transfer of nuclear-spin states of caesium atoms in high magnetic fields

Nuclear-spin states of gaseous-state Cs atoms in the ground state are optically manipulated using a Ti:sapphire laser in a magnetic field of 1.516T, in which optical coupling of the nuclear-spin states is achieved through hyperfine interactions between electrons and nuclei. The steady-state population distribution in the hyperfine Zeeman sublevels of the ground state is detected by using a tunable diode laser. Furthermore, the state population transfer among the hyperfine Zeeman sublevels, which results from the collision-induced modification \delta a(\bm S \cdot \bm I) of the hyperfine interaction of Cs in the ground state due to stochastic collisions between Cs atoms and buffer-gas molecules, is studied at different buffer-gas pressures. The experimental results show that high-field optical pumping and the small change \delta a(\bm S \cdot \bm I) of the hyperfine interaction can strongly cause the state population transfer and spin-state interchange among the hyperfine Zeeman sublevels. The calculated results maybe explain the steady-state population in hyperfine Zeeman sublevels in terms of rates of optical-pumping, electron-spin flip, nuclear spin flip, and electron-nuclear spin flip-flop transitions among the hyperfine Zeeman sublevels of the ground state of Cs atoms. This method may be applied to the nuclear-spin-based solid-state quantum computation.