Resonance analysis in the photoionization of excited lithium below the 1s2l and 1s3l ionization thresholds of the Li atom
Resonance analysis in the photoionization of excited lithium below the 1s2l and 1s3l ionization thresholds of the Li atom
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DOI：
10.1103/physreva.64.062715
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发表时间：
2001-11
影响因子：
2.9
通讯作者：
P. Faucher;H.-L. Zhou;S. Bougouffa;F. Bely-dubau
中科院分区：
文献类型：
--
作者：
P. Faucher;H.-L. Zhou;S. Bougouffa;F. Bely-dubau
先前使用R-矩阵代码报道了从1 s 2 2 p 2 P a Li激发态计算1 s电子内壳层光电离[Zhou等人，A 59，462（1999）]。这些计算包括对于入射光子能量的部分和总光电离截面中的重要共振：（i）低于74 eV并且由于对于n = 2和3并且L = S、P和D的lsnln“1”2Le 2“自电离态，以及（ii））大于140 eV并且由于2ln”1“n“1”2Le自电离态。Zhou等人[Phys.Rev.A62，012707（2000）]最近使用本征相位导数技术沿着与量子亏损理论一起分析了对应于2ln“1”n“1”的后者共振。本文提出了在58-74 eV的入射光子能量范围内的前共振的分析。使用与Zhou等人[Phys.Rev.A62，012707（2000）]中相同的方法获得收敛到Li的1 s2 l 1，3L或1 s3 l 1，3L电离阈值的每个系列的谐振位置的确定。对Li +1 s2 s1 S阈值以下的能量，用鞍点方法将该结果与Chung [Phys.Rev.A57，3518（1998）]的理论结果进行了比较.在大多数情况下，一致性非常好，并讨论了一些差异。
Calculations of 1 s electron inner-shell photoionization from the 1s 2 2p 2P a Li excited state were previously reported using the R-matrix code [Zhou et al., Phys. Rev. A 59, 462 (1999)]. These calculations included important resonances in the partial and total photoionization cross sections for incident photon energies (i) lower than 74 eV and due to the I snln'l' 2 L e >' autoionizing states for n = 2 and 3 and L = S, P, and D, and (ii) ) larger than 140 eV and due to the 2ln'l'n"l" 2Le autoionizing states. The latter resonances corresponding to 2ln'l'n"l" were recently analyzed by Zhou et al. [Phys. Rev. A 62, 012707 (2000)], using an eigenphase derivative technique along with quantum defect theory. The present paper proposes an analysis of the former resonances in the 58-74 eV incident photon energy range. The determination of the resonant positions for each series converging to a 1s2l 1 , 3 L or I s3l 1 , 3 L ionization threshold of Li is obtained using the same method as in Zhou et al. [Phys. Rev. A 62, 012707 (2000)]. The identifications are compared with theoretical results of Chung [Phys. Rev. A 57, 3518 (1998)] using the saddle-point method for energies below the Li + 1s2s 1 S threshold. Agreement is excellent in most cases and some discrepancies are discussed.