束—气条件下He（2^3S）＋CH2Cl2碰撞传能反应的动力学研究

本文在束－气条件下研究了亚稳态原子Ｈｅ（２＾３Ｓ）与ＣＨ２Ｃｌ２间的传能反应，测得了由该反应产生的ＣＨ（Ａ＾２△－Ｘ＾２П），ＣＨ（Ｂ＾２∑＾－Ｘ＾２П）ＣＨ（Ｃ＾２∑＾＋－Ｘ＾２П）和Ｈ原子（Ｂａｌｍｅｒ系）的化学发光光谱。通过对ＣＨ（Ａ，Ｂ）的光谱进行计算机模拟，推测出初手的ＣＨ（Ａ＾２△，ｖ＾１＝０－２）态振动分布为Ｎｏ：Ｎ１：Ｎ２＝１００：４０±５：１９±２，ＣＨ（Ａ＾２△，ｖ＾１＝０－０     

自由基分子CN（A^2Пi—X^2Σ^＋）的光谱研究

利用塞曼调制磁旋转光谱技术对自由基分子ＣＮ（Ａ＾２ΠＩ－ｘ＾２Σ＾＋）（１２,６）带、（７,２）带进行了测量,标识了光谱并拟合了Ａ＾２Πｉ太分子常数,从而得到Ｖ＝７Ｔ Ｖ＝１２振转谱带的Ｔｖ、Ａｖ、Ｂｖ、Ｄｖ等参数,还获得Ａ双分裂参数Ｐｖ和ｑｖ,两个带的总拟合方差分别为０．０３９和０．０４６ｃｍ＾－１。     

含R2dtc配体和V=O基的金属簇红外光谱研究

本文报道两类含Ｒ２ｄｔｃ配体的金属簇的红外光谱特点及某些规律,含Ｒ２ｄｔｃ的立方簇合物在４００－５００ｃｍ＾－１有较宽而弱的吸收,可归结于Ｍ－μ３Ｓ振动。Ｍ－Ｓｄｔｃ在３３０－３８０ｃｍ＾－１,Ｃ－Ｎ振动在１４７０－１５１０ｃｍ＾－１。二甲基ｄｔｃ配体立方的ｖ（Ｃ－Ｎ）与ｖ（Ｃ＝Ｓ）比值他二烷基ｄｔｃ立方烷的相应振动分别蓝移和红移,可归结于甲基超共轭效应所致。「Ｖ２Ｃｕ２Ｓ４（Ｒ２ｄｔｃ）２（ＰｈＳ）２」＾２－和「ＶＣｕ４Ｓ４（Ｒ２ｄｔｃ）ｎ（ＰｈＳ）４－ｎ」＾３－（ｎ＝０,１,２）的Ｍ－μ３Ｓ振动分别出现在４８０和４６５ｃｍ＾－１,可作为区别两类化合物的一个指标。另一类含（Ｒ２ｄｔｃ）２Ｖ２Ｏ２（μ－Ｓ）２单元的金属簇中,Ｖ－Ｏ伸缩频率在８４４－９７０ｃｍ＾－１范围内,（Ｅｔ４Ｎ）「Ｖ２Ｓ２Ｏ３（Ｅｔ２ｄｔｃ     

CO（a）与CS2和CS传能反应中激发态碎片形成速率

本文利用流动余辉技术研究了亚稳态ＣＯ（ａ）与ＣＳ２和ＣＳ的传能反应，测定了反应产生的激发态碎片ＣＳ（Ａ）和ＣＳ（ａ）的形成速率常数。ＣＯ（ａ）与ＣＳ２传能反应中ＣＳ（Ａ）和ＣＳ（ａ）的形成速率常数分别为３．４６×１０＾－１１ｃｍ＾３·ｍｏｌｅｃ＾－１·ｓｅｃ＾－１和１．１４×１０＾－１０ｃｍ＾３·ｍｏｌｅｃ＾－１·ｓｅｃ＾－１。ＣＯ（ａ）与ＣＳ传能反应中ＣＳ（Ａ）和ＣＳ（ａ）的形成速率常数分别为１     

新试剂2—（4—安替比林偶氮）—5—二乙氨基本胺与钯显色反应的研究及应用

在ｐＨ＝５．０ＨＡｃ－ＮａＡｃ缓冲介质中,吐温－８０存在下,２－（４－安替比林偶氮）－５－二乙氨基苯胺（ＡＤＥＡ）与钯生成２：１红色络合物,λｍａｘ＝５３０ｎｍ,δ－６．１５×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,钯的含量在０－２０μｇ／２５ｍＬ内符合比耳定律,本方法用于钯催化剂中痕量钯的测定,结果令人满意。     

新型显色剂2-(H-酸偶氮)-4,5-二硝基苯酚测定铁(Ⅲ)

本文研究了新试剂２－（Ｈ－酸偶氮）－４,５－二硝基苯酚与铁的显色反应,在ＰＨ５．３的ＮａＡｃ－ＨＡｃ缓冲介质中,ＨＡＤＮＰ与Ｆｅ（Ⅲ）生成３：１稳定紫色配合物,λｍａｘ＝５９０ｎｍ,ε＝１．７０＊１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,铁含量在０－１．０ｍｇ／Ｌ范围内符合比耳定律,该法用于自来水样中总铁的测定,结果令人满意。     

Br2分子里德堡态的高分辨转动谱研究

用窄线宽（０．０８ｃｍ＾－＾１）脉冲可调谐紫外激光和（２＋１）多光子电离方法测量了Ｂｒ２的里德堡（Ｒｙｄｂｅｒｇ）态光谱,在７００００－７１５００ｃｍ＾－＾１范围内,获得了溴分子［П３／２］４ｄ振动系列,测量（ｖ＇,ｖ”）＝（１,０）,（２,０）的高分辨振转谱,得到其转动常数Ｂ’７９－８１分别为０．０８８３２和０．０８８０５ｃｍ＾－＾１,并提出此系列的角动量量子数Ω应为１。     

H2O／KDEHP（75%）—HDEHP（25%）／n—HEPTANE微乳体系表面活性剂？…

利用傅里叶变换拉曼光谱和傅里叶变换红外光谱对Ｈ２Ｏ／ＫＤＥＧＰ（７５％）－ＨＤＥＨＰ（２５％）／ｎ＝ＨＥＰ－ＴＡＮＥ微乳体系的表面活性剂疏水链和极性头基与水分子的相互作用进行了研究。结果表明：当加水量由Ｗ０＝１增加至４３时,表面活性有性头基［ＰＯ２］＾－的反对称伸缩振动由１２３３ｃｍ＾－１移至１２０７ｃｍ＾－１,其对称伸缩振动由１０９４ｃｍ＾－１移至１０８９ｃｍ＾－１。表面活性剂疏水链的堆结构也发     

在He和Ne的流动余辉中POCl3的解离动力学

本文利用流动余辉技术研究了亚稳态原子Ｈｅ（２＾３ｓ）和Ｎｅ（＾３ｐ０．２）与ＰＯＣｌ３分子的传能反应，获得了激发态碎片ＰＯ（Ａ）和ＰＯ（Ｂ）的发射光谱，测定了Ｈｅ（２＾３ｓ）与ＰＯＣｌ３反应中ＰＯ（Ａ）和ＰＯ（Ｂ）的形成速率常数，其数值分别为：ＫＰＯ（Ａ）＝３．６８×１０＾－１１ｃｍ＾３·ｍｏｌｅｃｕｌｅ＾－１Ｓ＾－１和ＫＰＯ（Ｂ）＝９．４０×１０＾－１１ｃｍ＾３·ｍｏｌｅｃｕｌｅ＾－１·Ｓ＾－１     

析相光度法测定铜（Ⅱ）的研究

本文研究了Ｃｕ－ＰＥＧ－ＤＤＴＣ（铜试剂）（ＮＨ４）２ＳＯ４体系的析相光度法并应用于测定Ｃｕ。最宜酸度为３．６－９．０（ＮａＡｃ－ＨＡｃ，ＮＨ４Ｃｌ－ＮＨ３．Ｈ２Ｏ）缓冲溶液，其络合物的最大吸收位于４５０ｎｍ，表观摩尔吸光系数为９．０５×１０＾３Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ｃｕ浓度在０－３０μｇ／Ｌ范围内服从比耳定律，铜与ＤＤＴＣ形成组成为１：２的稳定络合物。该方法用于铝合金中铜的测定，获得了满     

Magnetic ordering in HoRu2Si2, HoRh2Si2, TbRh2Si2 and TbIr2Si2 by neutron diffraction

Neutron diffraction study of polycrystalline HoRu₂Si₂, HoRh₂Si₂, TbRh₂Si₂, and TbIr₂Si₂ was performed in the temperature range between 4.2 and 300 K. For HoRu₂Si₂ the magnetic spin alignment of a linear transverse wave mode below the Néel temperature 19 K is observed. This static moment wave is propagating along the b-axis with k=(0, 0.2, 0) and is polarized in the c-axis. The root-mean-square and maximum saturation moments per Ho atom are 9.26 and 13.09μ_B, respectively. HoRh₂Si₂, TbRh₂Si₂ an TbIr₂Si₂ are simple collinear antiferromagnets of +-+- type with Néel temperatures of (27±1), (98±2) and (72±3) K, respectively. For TbRh₂Si₂ and TbIr₂Si₂ magnetic moments are localized on RE ions only and are aligned along the tetragonal axis, while for HoRh₂Si₂ they form an angle ø = (28±3)°.     

13C-selective IRMPD of CBr2F2/Cl2 and CCl2F2/Br2 systems

The CO₂ TEA laser irradiation of CBr₂F₂ in the presence of Cl₂ yielded ¹³C-enriched CBrClF₂ and ¹³C-enriched CCl₂F₂ under selected experimental conditions. As the photolysis proceeded, the ¹³C concentration of CBrClF₂ decreased gradually and that of CCl₂F₂ increased up to 90% or higher. These results can be explained by the mechanism involving the secondary ¹³C-selective IRMPD of the primary product CBrClF₂. On the other hand, the carbon-containing product for a CCl₂F₂/Br₂ system was only CBrClF₂; the further IRMPD of which probably regenerated CBrClF₂ in the presence of Br₂. The decomposition probabilities of ¹²C- and ¹³C-containing molecules in both systems were measured as functions of laser line, laser fluence, and reactant pressures.     

μ+SR study of LaNi2As2, URh2Si2 and CeRh2Si2

Muon spin relaxation experiments have been carried out in the paramagnetic and magnetically ordered states of URh₂Si₂ and CeRh₂Si₂. As the magnetic structure of these compounds is well known, these measurements can help to characterise their magnetic properties probed by μSR and to understand the μSR results of the heavy fermion compounds of the same crystallographic family. Our measurements show that the muons occupy two different crystallographic sites. The spectra of URh₂Si₂ and CeRh₂Si₂ in the magnetically ordered states are very different, probably reflecting their different magnetic structures. The spectra obtained on CeRh₂Si₂ are similar to the published spectra of the heavy fermion compound CeCu_2.1 Si₂. Muon spin rotation measurements on LaNi₂As₂ indicate that the muon is diffusing at 150 K.     

Superconductivity in LaPd_2Bi_2 with CaBe_2Ge_2-type structure

正Since the discovery of superconductivity in LaFeAsO_(1-x)F_x,the high-T_c iron-based superconductors have been extensively studied from both experimental and theoretical viewpoints [1-8]. However, the mechanism of the unconventional superconductivity is still to be resolved. To     

X-ray photoemission spectra measurements of CeNi2Sb2 and CeCu2Sb2

X-ray photoemission spectra, resistivity and susceptibility of CeNi₂Sb₂ and CeCu₂Sb₂ were measured and are discussed. The results indicate that these alloys are Kondo systems. For comparison of the valence band properties, the spectra of the isostructural alloys of RT₂X₂-type with R = La, Gd, T = Cu, Ni and X = Sn, Sb were investigated, too.     

Eu2+掺杂CaSi2O2N2荧光粉发光性能

采用固相反应法合成了组成为Ca_1-xEu_xSi₂O₂N₂的Eu²⁺掺杂CaSi₂O₂N₂荧光粉.通过荧光光谱对样品的发光性能进行了研究,发现Eu²⁺掺杂CaSi₂O₂N₂荧光粉发射光谱为宽波段的单峰结构,主要包含绿光和黄光区,发射峰在556~568 nm.从发射光谱的宽带特征来看,CaSi₂O₂N₂:Eu²⁺的发射主要对应着Eu²⁺离子4f⁶5d→4f⁷跃迁.从激发光谱所覆盖的范围还可以看到,样品可以有效的被UV蓝-光激发,这意味着该类荧光粉在白光LED方面有可能得到广泛的应用.另外,样品的发光性能与激发离子的浓度有着很大关系.激发离子浓度增大时,发射光谱会发生明显红移.利用这一性质,可以通过改变Eu²⁺浓度来调节荧光粉的发光范围,从而满足不同场合的需要.同时,Eu²⁺浓度提高,样品发射光谱的强度也会随之增强,在x=0.06时发射强度达到最大值,之后继续增加Eu²⁺浓度,强度不仅没有增加反而降低,即出现浓度猝灭现象.     

Magnetostriction of SmMn2Ge2 and GdMn2Ge2 intermetallic compounds

Longitudinal and transverse magnetostrictions of polycrystalline samples of intermetallic compounds RMn₂Ge₂ (R=Sm or Gd) are measured in pulsed magnetic fields up to 250 kOe. It is found that linear magnetostrictive strains of about 10^?3 arise in a temperature range in which the magnetic field causes a change in the magnetic state of a manganese magnetic subsystem. The results obtained are described within the model of a two-sublattice ferrimagnet with a negative exchange interaction in the manganese subsystem in terms of a strong dependence of this interaction on interatomic distances.     

Polar optic phonons in Hg2Cl2 and Hg2Br2

Far infrared (30–430 cm^?1) reflectivity measurements of Hg₂Cl₂ and Hg₂Br₂ single crystals have been performed in polarized light. The spectra, which are in agreement with group-theoretical predictions, were analyzed by the oscillator fitting procedure and Kramers-Kronig method. The results are compared with the existing data from other measurements and the large anisotropy of polar modes is briefly discussed. The polarization vectors of all long-wavelength symmetry modes were determined group-theoretically.