a—C：H（N）薄膜结构的X射互光电子能谱分析

采用直流－射频等离子增强化学汽相沉积技术制备ａ（Ｃ：Ｈ（Ｎ）薄膜，用Ｘ射互光电子能谱研究了混合气体中Ｎ２含量对薄膜成分与结构的影响，ａ－Ｃ：Ｈ（Ｎ）薄膜中含氮量可达９．０９％，对ａ－Ｃ：Ｈ（Ｎ）薄膜的Ｎｌｓ结合能谱的分析表明ａ－Ｃ：Ｈ（Ｎ）薄膜的结构是由Ｃ３Ｎ４相镶嵌在ｓｐ＾２键结合的Ｃｘ基体组成，其中Ｃ３Ｎ４相中Ｎ和Ｃ原子比接近４：３，不随薄膜中含Ｎ量改变，薄膜中Ｃ３Ｎ４相和ｓｐ＾３碳伯含量随Ｎ     

存在Kerr介质的广义Jaynes—Cummings模型非线性耦合强度对光场量 …

研究了由于Ｊａｙｎｅｓ－Ｃｕｍｍｉｎｇ模型和非谐振子模型构成的组合模型中光场的量了相位特性,计算了光场－Ｋｅｒｒ介质非线笥耦合常数与光场－原子耦合常数的比值在弱（ｎｇ＾－２〉〉ｎ＾－２ｘ＾２）。中性（ｎｇ＾－２～ｎ＾２ｘ＾－２）和强（ｎｇ＾２〈〈ｎ＾２ｘ＾２）非线性耦合情形对光场相位分布、相位平均值和相位涨落的影响,并将结果与Ｊａｙｎｅｓ－Ｃｕｍｍｉｎｇｓ模型和非谐振子模型析结果进行了比较。     

La2O3—BaO系复氧化物的现场拉曼光谱研究

对于Ｌａ０．２Ｂａ０．８－ｘＣａｘ（Ｏ，ＣＯ３）其中ｘ＝０．０、０．２、０．４、０．６氧化物在９７３Ｋ及甲烷氧化偶联（ＯＣＭ）条件下，无Ｃａ＾２＋的样品可用表面ＢａＣＯ３和（ＬａＯ）２ＣＯ３的Ｒａｍａｎ谱及８１０ｃｍ＾－１附近的Ｏ２＾２－特征峰来表征；含Ｃａ＾２＋的样品，则表现了混合碳酸盐（Ｃａ，Ｂａ）ＣＯ３的特征，还有位于１１３５ｃｍ＾－１（ｗ）和８１０ｃｍ＾－１（ｗ）的Ｏ２＾－、Ｏ２＾２－瞬时     

发光体Mg2Y8—x—y（SiO4）6O2：Eux^3^＋,Biy^3^＋的形成过程及发光…

采用Ｓｏｌ－Ｇｅｌ方法首次在比较低的温度下制氧磷灰石结构的发光体Ｍｇ２Ｙ８－ｘ－ｙ（ＳｉＯ４）６Ｏ２：Ｅｕｘ＾３＾＋，Ｂｉｙ＾３＾＋（ｘ，ｙ≥０），利用ＸＲＤ，ＩＲ，ＴＧ－ＤＴＡ三种手段研究了发光体的形成过程。室温（２９３Ｋ）和液氮温度（７７Ｋ）的荧光光谱表明Ｅｕ＾３＾＋和Ｂｉ＾３＾＋在这种基质中分别发射红光和蓝光，每ｍｏｌ基质中其最佳掺杂浓度分别为０．１４ｍｏｌ和０．０３ｍｏｌ，并且其发光都存在     

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     

Siδ掺杂AlxGa1—xAs／GaAs异质结二维电子气的SdH振荡研究

使用分子束外延方法生长了一种新的基于Ｓｉδ掺杂的ＡｌｘＧａ１－ｘＡｓ／ＧａＡｓ异质结，测量了０．３－３０Ｋ低温下异质结处二维电子气的横向磁阻、迁移率和Ｈａｌｌ电阻，磁阻的Ｓｈｕｂｎｉｋｏｖ－ｄｅ Ｈａｓｓ（ＳｄＨ）振荡非常明显。对振荡曲线作快速Ｆｏｕｒｉｅｒ变换分析，获得了二维电子气中每一子能带上占据的电子数密度和有效质量（ｍ＾＊０／ｍ０＝０．０７３，ｍ＾＊１／ｍ０＝０．０６８）。随温度降低，子带     

具有Keggin结构的多元杂多化合物的合成与光谱研究

本文合成了一些具有Ｋｅｇｇｉｎ结构的Ｐ－Ｖ－Ｍｏ－Ｗ四元杂多阴离子「ＰＶｘＭｏｙＷ１２－ｘ－ｙＯ４０」＾（３＋ｘ）－的化合物（其中,ｘ＝１,２和３）,并对其进行红外和拉曼光谱研究,可看到化合物的νａｓ（Ｍ＝Ｏｄ）、νａｓ（Ｍ－Ｏｂ－Ｍ）和νａｓＭ－Ｏｃ－Ｍ）的红外伸缩振动峰随着Ｖ原子数目的增加而红移;而钨原子数目的增加一般使之蓝移,但在所研究的ＰＶ２Ｍｏ９Ｗ和ＰＶ３Ｍｏ８Ｗ杂多化合物却出现略为反常     

（La2／3Ca1／3）（Mn（3—x）／3Gax／3）O3体系巨磁电阻效应和电特性的研究

采用固态反应法制备了（Ｌａ２／３Ｃａ１／３）（Ｍｎ（３－ｘ）／３Ｇａｘ／３）Ｏ３（ｘ＝０．００，０．１０，０．１５，０．２０，０．３０）体系的系列样品。通过系统地测量其零场和１．６特斯拉（Ｔ）磁场下样品的电阻率－温度关系以及一定温度下磁电阻率与磁场的关系，发现随Ｇａ＾３＋替代量的增加其磁电阻率峰和电阻率峰均向低温方向移动，磁电阻率峰值增大，并伴生磁电阻率峰展宽效应。作者认为，上述结果是由于Ｇａ＾３     

不对称五氮齿大环金属配合物的光克尔效应

用飞秒脉冲激光作光源,利用泵浦－－探测方法测量了９个不对称五氮齿大环金属配合 物的时间分辨光克尔效应的响应信号,据此得到了它们的三阶光学非线性极化率ｘ＾（３）１１１１＝１．１９－３．３８×１０＾－１３ｅｓｕ和分子二阶超极化率γ１１１１＝８．０×１０＾－３２－２．８３×１０＾－３１ｅｓｕ以及光克尔效应响应不大于１６５ｆｓ等信息,讨论了周边取代基,中心金属离子和共轭π电子数对配合物三阶光学非线性极化率     

（Gd,Y）P5O14：Ce,Tb中Gd的中介能量传递和传递几率计算

研究了稀土五磷酸盐ＧｄｘＹ１－ｘ）Ｐ５Ｏ１４：Ｃｅ０．０１，Ｔｂ０．０２体系中以Ｇｄ＾３＋子晶格为中介的Ｃｅ＾３＋→Ｇｄ＾３＋→Ｔｂ＾３＋的能量传递现象。当ｘ＞０．７，在室温下激发Ｃｅ＾３＋离子可以产生有效的Ｔｂ＾３＋的发光。对ｘ＝１和０时，激发Ｃｅ＾３＋产生Ｔｂ＾３＋的发光，前者的强度约为后者的１０倍。     

萘二甲酰亚氨基席夫碱类液晶材料的三阶非线性光学性能研究

采用波长λ=532nm和脉宽г0=35ps的Nd:YAG锁模脉冲激光，运用双光束前向简并四波混频（DFWM）的方法，测量了两种萘二甲亚氨基席夫碱类液晶材料的三阶非线性效应，测得其离共振三阶非线性系数X^(3)及响应时间，计算了它们的超极化率γ^(3)和非线性折射率n2，同时探讨了它们的非线性形成机制。     

Magnetic susceptibility of iron pyrite (FeS2) between 4.2 and 620 K

The magnetic susceptibilities (χ) of several natural single crystals of iron pyrite (FeS₂) have been measured between 4.2 and 620 K with a force magnetometer. The measured susceptibilities are shown to related to the magnetic impurities present in the samples. For a pure sample, χ = 1.7 × 10^?7 emu/g at room temperature, with a small monotonic increase of χ with temperature. The results for a pure sample are interpreted in terms of contributions from diamagnetism and Van Vleck paramagnetism.     

The magnetic susceptibility of lutetium-hydrogen solid solution alloys from 2 to 300 K and a re-evaluation of the low temperature heat capacity results

The magnetic susceptibility, χ, of several lutetium-hydrogen solid solution alloys was measured between 2–300 K. Compositions varied from an electrotransport purified Lu (0.018 at% H) sample to 6.4 at% H alloy. Several samples exhibited large magnetic anisotropies, which complicated the analysis. The measured susceptibilities were compared to low temperature heat capacity results measured earlier on the same samples. It appears that pure Lu is a spin fluctuation material and the fluctuations are quickly degraded by impurities. While the variation of χ vs. composition is similar to that of γ (the electronic specific heat constant) vs. composition, the low temperature χ peaks near 3.0 at% H compared to 1.4 at% H for γ. This difference is thought to be due to hydrogen tunneling, which gives rise, in part, to a linear contribution to the heat capacity. Correcting for this brings the concentration dependence of γ in good agreement with the χ dependence of the hydrogen content.     

Intrinsic and extrinsic magnetic susceptibilities of some TCNQ complexes

The magnetic susceptibilities (χ) of quinolinium·(TCNQ)₂, N-methyl phenazinium·TCNQ and Li·TCNQ were measured from 2 to 300 K and are discussed in connection with the low-temperature specific heats (C) measured by other authors, χ is decomposed into three parts: χ_d the temperature-independent part, χ_c, Curie-Weiss type paramagnetism, and χ_p, the remainder. Correspondingly, C is composed of three terms, γT, H/T² and αT³. The electronic state of these substances is discussed in terms of each type of susceptibility.The model, on which the above separation of χ and C is based, defines two types of electrons: localized electrons associated with a magnetic moment and band electrons. Though this model is useful phenomenologically, it is shown that the analysis of χ on the basis of this model indicates less band electrons and more localized electrons or stronger magnetic interactions than does that of C.     

Structure-dependent magnetic susceptibility of sharp poly(ethylene oxide) fractions

Nine sharp fractions of poly(ethylene oxide) (PEO) glycol with number-average molar masses (M _n) in the range from 0.6 × 10³ to 20 × 10³ (PEO-0.6 to PEO-20) were characterized by magnetic susceptibility χ measured in the temperature interval 293 K to 378 K. In contrast to the liquidlike PEO-0.6 with temperature-invariant χ, the values of χ for each of the remaining solid samples, after the initial increase, exhibited two plateaus separated by a relatively narrow temperature interval of their second increase. The jumps of χ at lower and higher temperatures were attributed to a solid-state transition of unspecific nature and to the melting of the crystal fraction, respectively.

The temperature-invariant values of χ_n in the melt state above T _m pass through a minimum for the sample PEO-2.0 and then increase again with (M_n) to a limiting value χ_∞ = ?0.622 × 10^?6. It is concluded that a considerable contribution of the molar-mass-dependent “paramagnetism” χ_P = χ ^? χ_d (where χ_d is the diamagnetic contribution estimated by Kirkwood's equation) to the total magnetic susceptibility of PEO fractions reflects distortions of the spherical symmetry of the electron shells around chain atoms resulting from the discontinuous change of both inter- and intrachain interactions as the (M_n) increases through and above the critical crossover molar mass (M_cr ) = 2 × 10³.     

χ particle production in π−p collisions at 38 GeV/c

The production of χ particles in the reaction π^?p → χ + … has been studied near threshold. The measurements have been performed at the 70 GeV IHEP proton synchrotron using the hodoscope spectrometer GAMS-2000. The χ particles have been identified through their decay χ → J/ψ + γ, J/ψ → e⁺e^?. In the region X_F ?0.4 the fraction of obsered J/ψ particles which is obtained via the decay of χ states is 0.44 ± 0.16. The χ longitudinal and transverse momentum distributions are similar to those obtained for J/ψ. The inclusive production cross section of χ particles (³P₁ and ³P₂ states) at 38 GeV/c is σ_XF>0 (π^?p → χ + …) = (28±11) nb.     

Investigations on analytic potential energy function,spectroscopic parameters and vibrational manifolds （d = 0） of the SD^＋（X^3∑^-） ion

This paper investigates the spectroscopic properties of the SD + (X 3 Σ ) ion by employing the coupled-cluster singles-doubles-approximate-triples [CCSD(T)] theory combining with the quintuple correlation-consistent basis set augmented with diffuse functions (aug-cc-pV5Z) of Dunning and co-workers. The accurate adiabatic potential energy function is obtained by the least-squares fitting method with the 100 ab initio points, which are calculated at the unrestricted CCSD(T)/aug-cc-pV5Z level of theory over the internuclear separation range from 0.09 to 2.46 nm. Using the potential, it accurately determines the spectroscopic parameters (D e , ω e χ e , α e and B e ). The present D e , R e , ω e , ω e χ e , α e and B e results are of 3.69119 eV, 0.13644 nm, 1834.949 cm 1 , 25.6208 cm 1 , 0.1068 cm 1 and 4.7778 cm 1 , respectively, which are in remarkably good agreement with the experimental findings. A total of 29 vibrational states has been predicted by numerically solving the radial Schro¨dinger equation of nuclear motion when the rotational quantum number J equals zero. The complete vibrational levels, classical turning points, inertial rotation and centrifugal distortion constants are reported when J = 0 for the first time, which are in good accord with the measurements wherever available.     

Competition between spin-glass and antiferromagnetic order in EuxSr1−xAs3

Measurements of the magnetic a.c. susceptibility χ of Eu_xSr_1?xAs₃ single crystals (0.10 ? x ? 0.78) are reported. For the lower concentrations, spin-glass like maxima with a.c. frequency dependent positions and heights are observed. Samples with x = 0.54 and 0.65 exhibit a complex magnetic behavior (with directional dependence of χ observed for x = 0.54) which gives way to antiferromagnetic ordering when x is further increased towards EuAs₃.     

The paramagnetic susceptability of neutron irradiated V3Ge single crystals

The paramagnetic susceptibility χ of V₃Ge single crystals was measured in the temperature range from 10 K to 350 K after irradiation with neutron fluences of $\text{(0.3?20) × 10}{}^{18}\text{n}\text{cm}{}^2\text{(E>1}\text{MeV}\text{)}$. Unirradiated crystals show a flat maximum at T=65±6 K, which disappears at high neutron doses. The temperature dependence and the absolute values of χ are continuously reduced by increasing neutron doses. This behaviour can be understood by the models of high density of states (DOS) proposed for A15 materials confirming the assumption that a sharp peak in the electronic density of states exists which is lowered and broadened by irradiation induced defects.