Electron-Impact Cross Sections for Ground State to np Excitations of Sodium and Potassium
Electron-Impact Cross Sections for Ground State to np Excitations of Sodium and Potassium
复制标题
钠和钾的基态到 np 激发的电子撞击截面
DOI：
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复制
发表时间：
2004
影响因子：
1.5
通讯作者：
Yong
中科院分区：
文献类型：
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作者：
P. Stone;Yong
原子碰撞激发截面对于低温等离子体和气体的模拟具有重要意义。虽然有许多实验和理论结果的激发到第一激发态，很少的信息是可用于激发到更高的状态。我们在这里提出的计算从基态的钠（n = 3至11）和钾（n = 4至12）的np级的激发。我们还提出了一个计算从激发钠水平3 p到3d的过渡，以显示该方法的通用性。使用Kim [Phys.Rev.A64，032713（2001）]早期开发的平面波玻恩截面的标度公式。这些公式已被证明是非常准确的，但使用简单。我们已经使用的核心极化势的Dirac-Fock波函数代码来计算目标原子波函数和匹配形式的偶极跃迁算子来计算振子强度和玻恩截面。这里的第一激发能级激发的定标玻恩结果与实验和其他理论数据非常吻合，而激发到接下来几个能级的结果与有限的可用数据吻合得令人满意。目前的结果激发到更高的水平被认为是唯一的数据。
Cross sections for electron impact excitation of atoms are important for modeling of low temperature plasmas and gases. While there are many experimental and theoretical results for excitation to the first excited states, little information is available for excitation to higher states. We present here calculations of excitations from the ground state to the np levels of sodium (n = 3 through 11) and potassium (n = 4 through 12). We also present a calculation for a transition from the excited sodium level 3p to 3d to show the generality of the method. Scaling formulas developed earlier by Kim [Phys. Rev. A 64, 032713 (2001)] for plane-wave Born cross sections are used. These formulas have been shown to be remarkably accurate yet simple to use. We have used a core polarization potential in a Dirac-Fock wave function code to calculate target atom wave functions and a matching form of the dipole transition operator to calculate oscillator strengths and Born cross sections. The scaled Born results here for excitation to the first excited levels are in very good agreement with experimental and other theoretical data, and the results for excitation to the next few levels are in satisfactory agreement with the limited data available. The present results for excitation to the higher levels are believed to be the only data available.