共查询到20条相似文献,搜索用时 62 毫秒
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对零实贡献 (Zero core contribution ,ZCC)模型进行了改进 ,采用解析计算方法 ,利用最大电荷密度半径和电子亲和能E计算了Cu-、Li-光脱离截面 ,计算结果与复杂的多组态方法给出的结果一致。 相似文献
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使用R-矩阵方法,对CII基态的光电离截面进行了六态和十态的密耦计算,得到了入射光子能量从1.8Ry到4.3Ry的总光电离截面,长度与速度表示符合很好。计算得到的截面包含了复杂的共振结构。与由英法等国联合开展的不透明度工程的理论计算结果进行了比较,两者在电离阈附近符合得比较好。计算表明,收敛于较高电离阈的共振系列对收敛于较低电离阈的共振系列有较大的干扰。由分波和电离后处于特定靶态的光电离共振峰的位置可确定CII单双高激发态能级的位置。 相似文献
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任意截面光波导的模式计算 总被引:4,自引:0,他引:4
提出了一种计算近理想形状任意截面光波导模式特性的方法。首先运用微扰理论计算出光波导的电磁场分布,然后从麦克斯韦方程出发推导出一个计算光波导传播常数的公式并由此得出其色散曲线,该方法没有繁杂的计算过程。 相似文献
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用量子亏损方法计算Rydberg态的光离化截面 总被引:1,自引:0,他引:1
本文讨论了用解析的量子亏损方法计算Rydberg态的光离化截面,在连续态波函数中考虑了截断因子及其影响。对Na、K等激发态光离化截面的计算表明,结果和别的理论计算值相一致,解析的量子亏损方法更适用于计算高激发态的光离化截面。 相似文献
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本文运用微分法由梯形截面介质光波导的近似模方程导出了模吸收损耗系数的公式.并结合计算实例进行了误差分析. 相似文献
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A 40-target state close-coupling calculation for the photodetachment cross section of negative atomic oxygen near threshold is carried out with core-valence electron correlation by using the R-matrix method. It was shown that after considering the excitations of two electrons from the 2s shell, the electron affinity of O^- (2s^22p^5{}^2P°) agrees with the experimental result much better than that just considering the excitations of electrons only from the 2p shell as well as only one electron from the 2s shell. Total cross section as well as the main contribution of the ionization channels to the partial cross section are illustrated to show the structure near threshold clearly. 相似文献
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用光电子成像技术研究了Cu-的飞秒双光子光脱附过程.光脱附产生的光电子能量分布和角度分布通过光电子成像直接获得.实验发现,在光强为6.0×1010 W/cm2下,双光子光脱附通道的光电子角度分布随激光波长出现剧烈的变化.通过低阶微扰理论和实验结果对比分析,Cu-的双光子脱附产生的光电子角度分布特征可以归结于脱附过程中Cu-的s和d轨道波函数之间的干涉效应.通过分析光电子角度分布特征,获得了不同波长下s和d轨道波函数对双光子脱附过程的贡献,该结果符合Wigner阈值理论的预期. 相似文献
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给出了H-在任意夹角的强电场和磁场中光剥离截面的量子解约化到闭合轨道解的形式,并将其计算结果与量子解的结果进行了比较. 相似文献
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The photo-detachment cross section of H^- near two parallel elastic interfaces is derived and calculated by using the closed orbit theory. The photo-detachment cross section of H^- near two interfaces is shown to exhibit multi-periodic oscillations when the distance between the H^- and the interface is varied. Each peak in the Fourier transformed photo-detachment cross section corresponds to the length of a closed orbit, which is quite similar to the case of atomic spontaneous emissions in a dielectric slab. This study provides a new understanding of the photo=detachment process of H^- in the presence of interfaces. 相似文献
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By using the micro-channel plate position sensitive detector with the delay-line anode we measure the single electron detachment cross sections for some transition elements in collision with Ar in the energy region 10-30 keV. These single electron detachment cross sections perform as velocity and electron affinity dependences. The experiments are carried out using the growth rate method. 相似文献
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In this paper, the quantum-mechanical photodetachment cross section of S^- in uniform electric and magnetic fields at arbitrary angles is presented. It compares the quantum-mechanical cross section with the quantum source formalism cross section. The results show that at large angle, the two results have good agreements, however, with the decrease of the angles, they deviate obviously from each other. The reasons for this discrepancy are also discussed. 相似文献
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With the new experimental data at ISR energies, it has been possible to determine the ? and the A2 exchange contributions to the differential cross section which take over from the π exchange contribution at intermediate energies. For the 1500 GeV/c data we have used the new data supplied by the experimentalists. 相似文献