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用定域的Xα交换势模拟高Rydberg电子同原子实中电子的交换作用,给出高里德堡电子的径向波函数,并计算了Na^**+He热碰撞的l-混合跃迁截面,计算 其它理论方法有明显改善。 相似文献
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本文采用一种考虑了原子心电子屏蔽不完全效应的屏蔽Coulomb近似波函数,在冲击近似下计算了高激发的碱金属钠原子同稀有气体氦原子热碰撞的l-混合跃迁截面。同其它方法比较,本文计算的结果在低n(指n<15)范围有明显改善。 相似文献
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赵新闻 《原子与分子物理学报》2000,17(3):500-504
在冲击近似方法基础上,采用一种拟合的Xα波函数计算了高激发态 碱金属钠原子同稀有气体氦原子热碰撞的l-混合跃迁截面。同其它方法比较,计算结果在 低n(n<12)范围有明显改善。 相似文献
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上转换发光材料由于低的发光效率,限制了其在太阳电池中的实际应用。为解决此问题,采用溶剂热法制备了LiYF4:Er3+/Yb3+上转换发光颗粒,在LiYF4基质中引入Na+来打破Er3+周围晶体场的对称性,增强其发光性能。研究了Na+掺杂对LiYF4:Er3+/Yb3+的结构、形貌及其发光的影响。结果表明:掺杂的Na+可以裁剪Er3+周围的晶体场,当Na+摩尔分数为15%时,得到了较大的发光增强,绿光和红光发射分别获得4.2倍和2.9倍的增强。Er3+周围晶体场对称性的降低和材料中OH基团的减少是其发光增强的主要原因。 相似文献
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采用柠檬酸作燃烧剂,在柠檬酸-硝酸盐体系下制备了Gd2O3 ∶ Sm3+和Gd2O3 ∶ Sm3+,Na+纳米晶。用X射线衍射仪、透射电子显微镜、荧光光谱仪等对样品的结构、形貌和光致发光性能进行了分析。结果表明:所得纳米样品为纯立方相,晶粒尺寸约为30 nm。在室温下,用275 nm激发光激发各样品时,可观测到Sm3+离子 的较强发光,其主发射峰位分别位于561.5,603.5,651.5 nm,分别对应着Sm3+离子的4G5/2→6H5/2 , 4G5/2→ 6H7/2 和4G5/2 →6H9/2的电子跃迁, 其中以4G5/2→6H7/2 跃迁的光谱强度最强。实验表明:Na+离子的掺入使得Sm3+离子的光发射强度显著增强。对引起样品荧光强度变化的原因进行了分析。 相似文献
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Mestayer JJ Zhao W Lancaster JC Dunning FB Reinhold CO Yoshida S Burgdörfer J 《Physical review letters》2007,99(18):183003
A protocol for steering Rydberg electrons towards targeted final states is realized with the aid of a chirped train of half-cycle pulses (HCPs). Its novel capabilities are demonstrated experimentally by transporting potassium atoms excited to the lowest-lying quasi-one-dimensional states in the n(i)=350 Stark manifold to a narrow range of much higher-n states. We demonstrate that this coherent state transfer is, to a high degree, reversible. The protocol allows for remarkable selectivity and is highly efficient, with typically over 80% of the parent atoms surviving the HCP sequence. 相似文献
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Sequences of phase-locked laser pulses have been employed to control the orbital angular momentum character of an electron wave packet, which is initially created from a superposition of s and d Rydberg series. By an intelligent choice of phase, which depends on the excitation energy and the quantum defects, we are able to selectively pump down either all or a fraction of one or other angular momentum component, and by employing multichannel quantum-defect theory we are able to analyze the quantum-state distribution in detail. 相似文献
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采用多重网格法(MG)和对称性理论以及密度泛函理论中著名的Kohn-Sham 方程,开发了一种计算具有一定对称性的原子簇的电子结构的方法,并对H2 分子的基态能进行了实际的计算,并与用其他理论计算得到的结果进行了比较。 相似文献
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本文采用激光短脉冲激发磁场中氢原子,研究氢里德堡波包在磁场中随时间的演化.结果证实氢里德堡波包在磁场中的运动也与闭合轨道密切相关.讨论了脉冲宽度τ对自动关联函数的影响以及不同初始态下的自动关联函数. 相似文献
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利用Dirac-Slater相对论自洽场理论研究了原子中电子的相对论波函数,说明了其主要特征:电子相对论波函数大小分量的变化趋势不完全"同步",即核外电子的分布没有严格的零几率点;通常电子相对论波函数的大小分量相差非常悬殊,但当束缚电子波函数的空间压缩较为严重、或自由电子的动能较大时,其相对论波函数的小分量的相对值就会增大,并在此基础上分析了束缚电子与自由电子波函数的主要异同点. 相似文献
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Wing-Cheung Tam C.E. Brion 《Journal of Electron Spectroscopy and Related Phenomena》1974,3(4):281-288
The electron energy loss spectrum of HCN has been determined in the energy region 8–13.6 eV at impact energies of 100, 50 and 30 eV. It is shown that energy loss spectra of HCN at intermediate impact energies can be satisfactorily analysed unlike the diffuse unassigned optical absorption spectra that have previously been reported. Rydberg series have been assigned using term values and quantum defects together with ionization potentials obtained by photoelectron spectroscopy. 相似文献
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A terahertz half-cycle pulse was used to retrieve information stored as quantum phase in an N-state Rydberg atom data register. The register was prepared as a wave packet with one state phase reversed from the others (the "marked bit"). A half-cycle pulse then drove a significant portion of the electron probability into the flipped state via multimode interference. 相似文献
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E. A. Shapiro 《Journal of Experimental and Theoretical Physics》2000,91(3):449-457
A graphic method for describing the localization of quantum wave packets in several dimensions is proposed. The method employs classical action-angle coordinates. Different kind of wave packets arising in the two-and three-dimensional Coulomb problems are described from a unified point of view. Specifically, a more precise interpretation of the structure of “angular” Rydberg wave packets is given. Certain additional features of the proposed approach are discussed. 相似文献