Non-dipole effects in the angular distribution of photoelectrons from the K-shell of N2 molecule
Non-dipole effects in the angular distribution of photoelectrons from the K-shell of N2 molecule
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DOI：
10.1088/0953-4075/39/2/l02
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
K. Hosaka;J. Adachi;A. Golovin;M. Takahashi;T. Teramoto;N. Watanabe;A. Yagishita;S. Semenov;N. Cherepkov
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文献类型：
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作者：
K. Hosaka;J. Adachi;A. Golovin;M. Takahashi;T. Teramoto;N. Watanabe;A. Yagishita;S. Semenov;N. Cherepkov
报告了随机取向 N2 分子 K 壳层光电子角分布中非偶极项贡献的测量和计算。角分布是在包含光子偏振和线偏振辐射的光子动量矢量的平面中测量的。计算是在带有分数电荷的松弛核 Hartree-Fock 近似中进行的，并且在随机相位近似中考虑了多电子相关性。理论和实验都表明，在从 K 壳层电离阈值到高于其约 70 eV 的光子能量区域中，非偶极子效应相当小。根据理论，单个 1σg 和 1σu 壳层的非偶极项相当大；因此，需要测量解决 1σg 和 1σu 壳的贡献。
Measurements and calculations of the contribution of the non-dipole terms in the angular distribution of photoelectrons from the K-shell of randomly oriented N2 molecules are reported. The angular distributions have been measured in the plane containing the photon polarization and the photon momentum vectors of linearly polarized radiation. Calculations have been performed in the relaxed core Hartree–Fock approximation with a fractional charge, and many-electron correlations were taken into account in the random phase approximation. Both theory and experiment show that the non-dipole effects are rather small in the photon energy region from the ionization threshold of the K-shell up to about 70 eV above it. From the theory, it follows that the non-dipole terms for the individual 1σg and 1σu shells are considerably large; therefore measurements resolving the contributions of the 1σg and 1σu shells are desirable.