排序方式: 共有43条查询结果,搜索用时 15 毫秒
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Nadir Khan 黄忠魁 汶伟强 Sultan Mahmood 豆丽君 汪书兴 许鑫 汪寒冰 陈重阳 啜晓亚 朱小龙 赵冬梅 冒立军 李杰 殷达钰 杨建成 原有进 朱林繁 马新文 《中国物理C(英文版)》2018,(6)
The accuracy of dielectronic recombination(DR) data for astrophysics related ions plays a key role in astrophysical plasma modeling. The absolute DR rate coefficient of Fe~(17+) ions was measured at the main cooler storage ring at the Institute of Modern Physics, Lanzhou, China. The experimental electron-ion collision energy range covers the first Rydberg series up to n= 24 for the DR resonances associated with the ~2 P_(1/2)→~2 P_(3/2)△n =0 core excitations. A theoretical calculation was performed by using FAC code and compared with the measured DR rate coefficient. Overall reasonable agreement was found between the experimental results and calculations.Moreover, the plasma rate coefficient was deduced from the experimental DR rate coefficient and compared with the available results from the literature. At the low energy range, significant discrepancies were found, and the measured resonances challenge state-of-the-art theory at low collision energies. 相似文献
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电子碰撞电离截面的全相对论扭曲波计算 总被引:1,自引:0,他引:1
在相对论框架下 ,给出了电子与高电荷态离子碰撞直接电离截面的扭曲波玻恩交换近似计算方法 .作为示例 ,计算了几个离子 (类氢、类锂和类氖离子 )的电离截面 ,计算结果与实验值和其它理论计算值有比较好的符合. A fully relativistic distorted-wave exchange approximation method is presented. It can be used to obtain electron impact ionization cross section of highly charged ions. The ionization cross sections of several H-, Li, and Ne-like ions have been calculated. Good agreement is obtained while the calculated values are compared with the experiments or other relativistic calculations. 相似文献
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本文在偶极近似下,采用准相对论扭曲波近似方法系统得计算了10种类氯离子辐射复合到2P子壳层中发射光予的各向异性因子、角分布和极化,给出了各向异性因子的经验公式。 相似文献
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A systematic study is carried out on the angular distribution and polarization of photons emitted following radiative-recombination of bare and He-like ions of Ne, At, Ni and Mo with a unidirectional electron beam. In order to incorporate the screening effect due to inner-shell electrons, a distorted wave method is used. Scaling rules for polarization of the photon following radiative recombination to both bare and He-like ions are given for the incident energy regions up to six times the ionization threshold energy of the final state. 相似文献
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培养学生的数学核心素养已成为高中数学教学目标的主要导向之一,课堂是培养高中数学核心素养的主阵地,培养高中数学核心素养应发展在数学的“知识之后”,蕴含在数学的“思维之中”,升华在数学的“方法之上”.“知识之后”“思维之中”“方法之上”促成高中数学核心素养的三维生长,本文结合“点到直线的距离公式”的课堂教学进行介绍. 相似文献
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立体几何中的空间距离(指点线距离,点面距离,线面距离,异面直线距离及平行平面距离;下同)是用数量刻划点、线、面的空间位置关系,也是空间垂直关系的运用和拓展,在立体几何中有着重要的地位,由于空间距离涉及到诸多的线与线,线与面、面与面的垂直关系, 相似文献
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