类Ne锌X射线激光的实验研究

介绍了在“星光”装置上进行的类Ｎｅ锌Ｘ射线激光实验．激光器输出能量为１８０～２００），单脉冲泵浦时观测到２６．２ｎｍ、２６．７ｎｍ（Ｊ＝２—１）两条激光线，加预脉冲方式泵浦时观测到了２１．２ｎｍ（Ｊ＝０—１）、２６．２ｎｍ、２６．７ｎｍ（Ｊ＝２—１）和３１．４ｎｍ（Ｊ＝２—１）四条激光线。     

A one-dimensional zigzag coordination polymer: catena-poly­[[di­aqua­pyridine­nickel(II)]-μ-pyridine-2,3-di­carboxyl­ato-κ3N,O2:O3]

The asymmetric unit of the title one-dimensional coordination polymer, [Ni(C₇H₃NO₄)(C₅H₅N)(H₂O)₂]_n, contains a quino­linate dianion, a nickel(II) ion, two water mol­ecules and a pyridine mol­ecule. The pyridine-2,3-di­carboxyl­ate (quino­linate) ligands connect the nickel(II) ions in a head-to-tail fashion, resulting in the formation of a one-dimensional zigzag chain. Adjacent chains form pairs via an extensive network of hydrogen-bonding interactions. A weak C—H...O intermolecular hydrogen bond links neighboring pairs of chains, thus generating two-dimensional double-sheet layers that are stabilized viaπ–π-stacking interactions between adjacent quinolinate pyridyl rings.     

CaAl3BO7：RE(RE=Ce,Gd,Tb)中稀土离子的光谱特性

采用固相反应法合成了CaAl₃BO₇RE(RE=Ce,Gd,Tb),研究了Ce³⁺,Gd³⁺和Tb³⁺的光谱特性。发现铈离子周围存在较强的晶场,使基态的4f能级劈裂较大,从而导致铈离子的特征发射峰重叠较大;Ce³⁺的5d能级明显低于Gd³⁺的⁶I、⁶P能级;Ce³⁺和Tb³⁺之间存在有效的能量传递。     

THE CAPACITY DENSITY AND THE HAUSDORFF DIMENSION OF FRACTAL SETS

ＴＨＥＣＡＰＡＣＩＴＹＤＥＮＳＩＴＹＡＮＤＴＨＥＨＡＵＳＤＯＲＦＦＤＩＭＥＮＳＩＯＮＯＦＦＲＡＣＴＡＬＳＥＴＳ￥ＸｕＹｏｕ（ＩｎｓｔｉｔｕｔｅｏｆＭａｔｈｅｍａｔｉｃｓ，ＦｕｄａｎＵｎｉｖｅｒｓｉｔｙ，Ｓｈａｎｇｈａｉ２００４３３，Ｓｈａｎｇｈａｉ，...     

Study of MO2N catalyst activity and stability in CO oxidation

Unsupported molybdenum nitride powder with S_g of 115 m²g⁻¹ (passivated) has been prepared by the temperature-programmed reaction of MoO₃ in H₂/N₂ mixture. It exhibited high catalytic activity in CO oxidation. DTA experiments in the air flow and O₂ temperature-programmed pulse reaction (TPPR) showed that the optimal oxidation temperature for the Mo₂N catalyst was under 450°C because of its instability at high temperature in the presence of O₂.