C原子、离子光电离过程的规律研究
Relativistic multipole calculations on photoionization of cabon
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摘要: 基于Dirac-Slater自洽场方法,计算了C原子及各价离子从低能到高能的光电离截面。通过各种理论计算结果的比较,分析了Kramers公式的适用性。定量地考察了多极效应和相对论效应在不同能区对光电离截面的影响,并研究了光电离截面随光子能量、壳层、电离度变化的规律。
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关键词:
- Dirac-Slater自洽场方法 /
- 光电离截面 /
- 多极计算
Abstract: Based on the Dirac-Slater self-consistent-field method, the photoionization cross sections of electrons in 1s, 2s and 2p subshells of carbon atom with different degree of ionization (CI, CII, CIII, CIV, CV, CVI) are calculated from ionization threshold to 300 keV. In the calculation, the multipole and relativistic effects have been included. Variations of cross sections with the photon energy, ionization degree and subshells are investigated. The results are also compared with the data obtained from the Kramers formula with the Gaunt factor correction and the data of Verner et al. The validity of Kramers formula is discussed.
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