较小动量转移下γ射线的相干散射

用¹⁴¹Ce源的145keVγ射线和Ge(Li)谱仪,对Al,Fe,Cu,Pb样品,在动量转移x=1.2—5?^-1的范围内的相干散射进行了测量,实验结果在误差范围内与基于相对论的Hartree-Fock方法的形状因子近似理论计算值相吻合。 关键词：     

类氦离子的电子碰撞电离微分截面

本文主要利用扭曲波玻恩交换近似方法(DBE)计算类氦离子在电子碰撞下,相应不同的末态电子能量分配的电离截面(能量微分截面)。发现对这些微分截面在不同靶电荷及入射能量下,都可用带两个参数的高斯函数αexp(β(x—0.5)²)很好地拟合。还给出两个拟合参数随靶电荷和入射能量的变化曲线,以及讨论了在库仑波玻恩交换近似(CBE)和DBE两种不同近似下所得参数值的差别。计算结果也表阴,在低靶电荷和低入射能量时用DBE计算的必要性。 关键词：     

OPTICAL ISOTOPE SHIFTS AND CONFIGURATION MIXING AT THE LEVEL (26772)011/2 IN Nd II

Optical isotope shifts in the transition 4f⁴5d ⁶I_11/2-(26772)⁰_11/2 of Nd II were measured by using collinear fast-ion-beam laser spectroscopy. The configuration admixtures of the previously unclassified (26772)⁰_11/2 level were quantitatively analyzed to be 4f⁴6p, 4f³5d², and 4f³5d6s with mixing probabilities of 13%, 85%, 2%, respectively.     

EFFECT OF CONFIGURATION INTERACTION ON EXCITATION AUTOIONIZATION CROSS SECTIONS

The effect of configuration interaction (CI) on the theoretical calculation of autoionization cross section for Li-like ions are studied in detail by employing the distorted wave Born exchange approximation. We consider the 1s²2s→1s2s2p and 1s²2s→1s2s3p transitions for Cs³⁺ and Al¹⁰⁺ ions. These two transitions account for the largest excitation autoionization cross section. It is found that the CI has a significant effect on the calculated results. The effect becomes larger with increasing atomic number.     

制药工程专业有机化学研究性学习实践初探

探讨了在制药工程专业有机化学研究性学习的教学组织中教师引导、组织、指导的角色定位以及实施方略.     

氧在金属及其氧化物中的表面及扩散势垒的计算

使用一种较简单的计算方法，研究了氧在简单金属及其氧化物中的表面穿透势垒及扩散势垒，发现表面势垒及扩散势垒值依赖于材料结构及弛豫能力．部分数据与现有的实验值作了比较，两者基本相符． 关键词：     

OPTICAL ISOTOPE SHIFTS OF Nd II (25524)011/2 USING COLLINEARFAST-ION-BEAM LASER SPECTROSCOPY

Fast-ion-beam laser spectroscopy which has the characteristics of selective excitation and high accurate measurement was widely used to study isotope shifts, radioactive lifetimes, and hyperfine structures of atoms and ions. In this work, the optical isotope shifts for the transition 4f⁴5d⁶K_13/2-(25524)⁰_13/2 in Nd II were measured by using collinear fast-ion-beam lase r spectroscopy.     

微扰分子轨道理论与Diels-Alder反应

本文介绍了用于分析Diels-Alder反应的前线轨道的微扰分子轨道理论(PMO),从而用前线轨道的分子轨道系数和能量,解释了D-A反应的反应性规律和区域选择性规律。     

铯离子/原子与金属表面电荷交换的计算

用Ｎｅｗｎｓ－Ａｎｄｅｒｓｏｎ量子模型，计算了低能铯离子与涂有铯原子的钨表面（Ｃｓ／ｗ（１１０））碰撞时，由于电荷交换引起的末态电荷态的分布与Ｃｓ／Ｗ（１１０）表面功函数及表面温度的关系，计算结果与相应的实验符合得较好。同时，也给出了铯离子和原子与Ｃｓ／Ｗ（１１０）表面相互作用过程中粒子电荷态变化的全过程，并对两者作了比较． 关键词：