STUDY OF HIGH-LYING EXCITED STATES OF RARE-EARTH ELEMENT Dy BY LASER RESONANCE IONIZATION SPECTROSCOPY

This paper describes the investigation of high-excited states of Dy. which includes the measurement of high Rydberg states and autoionizing states, by means of laser resonance ionization spectroscopy (LRIS). Two high Rydberg series (n>40), 4f¹⁰(⁵I₈) 6sns and 4f¹⁰(⁵I₈) 6snd, have been obtained by exciting the state of 4f¹⁰(⁵I₈) 6s6p (³P⁰₂) ⁵I⁰₈ using two-step laser excitation-electric field ionization method. With the data obtained, we determined the first ionization potential of Dy. It is 47901.7±0.6 cm^-1, that is. about one order more accurate than the results given in the literature. Using the same technique, we found 97 autoionizing states by exciting the state of 4f⁹5d6s(⁷H⁰₇).     

控制成核生长大尺寸C60，C70单晶

通过改进双温区双温度梯度方法，成功地控制成核密度，分别生长出线度可达6mm和5mm的大尺寸C₆₀，C₇₀单晶，并对其表面形貌和晶体结构进行了研究. 关键词：     

一维格子自旋开链的Lax表述

提出了量子完全可积格子自旋开链的Ｌａｘ表述．特别地，明显构造了具有一般边界项的一维Ｈｅｉｓｅｎｂｅｒｇ ＸＸＺ开链的Ｌａｘ对，从而给出了其量子可积性的直接证明 关键词：     

泡沫塑料吸附—石墨炉原子吸收光谱法测定地质物料中痕量铊

本文研制定了一种泡沫塑料吸附－石墨炉原子吸收光谱法测定地质物料中痕量铊的分析，在所先定的实验条件下，方法检出限为０．０５μｇ／ｇ、样准曲线范围为１０－３００ｎｇ／ｍＬ，Ｔｌ含量水平为０．７１μｇ／ｇ时的测定精度为６．０％，方法回收率９９．０％－１００．０％。经标样及大量样品分析验证，分析方法准确可靠。     

Experimental study on high-pressure adsorption of hydrogen on activated carbon

A systematic measurement of H2 adsorption on activated carbon over a wide scope of conditions was completed for the first time using a novel cryostat developed by the present authors. The equilibrium temperatures covered 77-298 K with the space of about 20 K, and the equilibrium pressures increased from 0 to about 7MPa. A set of adsorption/desorption isotherms was obtained by a standard volumetric method. This set of experimental data was fitted to all the well-known models of type-I isotherms, and Dubinin-Astakhov (D-A) equation was found to be the best-fit one On the basis of D-A model one can predict adsorption with relative error of ±4%. A 3-dimensional adsorption surface was also constructed, and the isosteric heat of adsorption was analytically determined. Except in the low pressure area, the calculated values agreed well with the experimental ones. Finally, the troubles encountered in applying D-A equation to supercritical adsorption is discussed.     

用电子探针对广西金牙微细粒金矿金赋存状态的研究

微细粒金赋存状态的研究，对搞清此类金矿的成因，指导这类金矿的勘探、开采和选冶有着重要意义，本文报道了用电子探针对广西金牙微细粒金矿的矿石进行了观察分析，首次在金牙金矿床含金矿化物表面发现了含铂汞金矿、汞金矿、铂金太航自然金，并确定出它们的尺度。     

直流外电场诱导的MgI高里德堡态的混合

在直流外电场存在时,观察到MgI的经双光子禁戒跃迁3s~2 ~1S→3mp ~(1P)的多光子电离和倍频效应并解释为外电场引起的里德堡(Rydberg)态之间轨道角动量的混合.实验结果与理论解释一致.     

Y(Mn1-xCox)12磁结构的中子衍射分析

在研究Y(Mn_1-xCo_x)₁₂晶体结构的基础上,为了分析这种化合物的磁结构,我们挑选了不同成分的试样,在液氮温度下作了中子衍射测量。实验上测到的磁有序超结构峰可以用YMn₁₂单胞指标化为h十k+l=2n+1。使用各种可能的磁结构模型对数据进行了分析,根据计算强度与观测强度的最佳拟合,得出了Y(Mn_1-xCo_x)₁₂的磁结构随x变化的某些结论。 关键词：     

分位点函数的光滑非参数估计的BAHADUR表示

文中对分位函数给出了具有更广泛应用的光滑分位估计,证明了该光滑分位估计的逐点和一致的Bahadur强表示定理;并由此结果推导了估计的重对数律,强逼近等深刻结果。     

MnAlC永磁合金的中子衍射研究

用中子衍射技术研究了Mn_1.074Al_0.871C_0.055永磁合金的晶体结构和磁结构,Mn_1.074Al_0.871C_0.055为四角体心结构,从中子衍射谱线的拟合结果可以看出:0.992Mn和0.008C占据(0,0,0)晶位;0.082Mn、0.87lAl和0.047C占据(1/2,1/2,1/2)晶位,在不同晶位上的Mn原子的磁矩沿c轴方向反平行排列,把这些结果与Mn_1.09Al_0.91二元合金的中子衍射结果相比较,可以解释Mn_1.074Al_0.871C_0.055三元合金的磁性和机械性能都可获得明显提高的原因。 关键词：