Effect of Exchange on XUV Absorption Spectrum of Atoms

Fig. 5. Comparison of absorption cross section with or without exchange interaction. (a) Absolute size; (b) difference in relative strength before and after considering exchange interaction

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Fig. 6. Comparison of absorption cross section between Ref. [12] and new model

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Fig. 7. XUV absorption chromatographic temperature diagram of He atom

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Fig. 8. Laser wave packet and atomic absorption cross section under different delay time. (a) Wave packet overlap diagram; (b) absorption cross section diagram

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Fig. 9. Absorption spectra with different IR light; (a) Absorption spectrum corresponding to ω_L=2.38×1.05 eV; (b) absorption spectrum corresponding to ω_L=2.38×0.95 eV

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Table 1. Comparison of energy level difference before and after
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Table 1. Comparison of energy level difference before and after
Item ${Δ_{13}}_{}$ / eV Error of ${Δ_{13}}_{}$ /% ${Δ_{23}}_{}$ /eV Error of ${Δ_{23}}_{}$ /%
Experimental value 23.06 — 2.51 —
Before considering 22.10 4.16 2.00 20.32
After considering 21.61 6.29 2.38 5.18

Table 2. Comparison of various components of dipole moment

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Table 2. Comparison of various components of dipole moment

Item	With exchange effect	Without exchange effect
Contribution of electrons in ground state (d1)	2D₁₁ ${\|C_{1}\|}^{2}$	D₁₁( ${\|C_{1}\|}^{2}$ +1)
Contribution of electrons at 2s (d2)	(D₁₁+D₂₂) ${\|C_{2}\|}^{2}$	D₂₂ ${\|C_{2}\|}^{2}$
Contribution of electrons at 3p (d3)	(D₁₁+D₃₃) ${\|C_{3}\|}^{2}$	D₃₃ ${\|C_{3}\|}^{2}$
Contribution of transition from ground state to 3p (d4)	2 $\sqrt[]{2}$ Re[D₁₃ $C_{1}^{*}$ C₃exp(-iΔ₁₃t)]	2Re[D₁₃ $C_{1}^{*}$ C₃exp(-iΔ₁₃t)]
Contribution of transition from 3p to 2s (d5)	2Re[D₂₃ $C_{2}^{*}$ C₃exp(-iΔ₂₃t)]	2Re[D₂₃ $C_{2}^{*}$ C₃exp(-iΔ₂₃t)]