研究目的
Investigating the electron correlation in the double photoexcitation of H2S and comparing it with H2O to understand the differences in their electronic structures and the formation of H(2p) atoms.
研究成果
The study found that the electron correlation in H2S is stronger than in H2O, leading to smaller values of the dipole oscillator strengths for H(2p) formation in H2S. The energy splitting of the doubly excited states in H2S is enhanced compared to H2O, and the border between the inner valence and outer valence ranges becomes more obscure in H2S. The similarity in shape between the inner valence band and inner shell band in the fluorescence cross sections for H2S and H2O indicates that electrons are excited to similar orbitals from the valence or inner shell orbitals.
研究不足
The study is limited by the energy resolution of the incident photon energy and the complexity of separating the Lyman-α fluorescence from other fluorescences in the nondispersed experiments of H2S. The change of the major fragment atoms from H(2p) to S? in H2S also poses challenges in data interpretation.
1：Experimental Design and Method Selection:
The study involved measuring cross sections for the emission of dispersed and nondispersed atomic fluorescence against the incident photon energy in the range 11–40 eV. The method allowed extraction of discrete electronic states from the superposition with continuous electronic states.
2：Sample Selection and Data Sources:
H2S and H2O were used as samples. The experiments were performed at the 10 m NIM beamline of undulator U125-2 of the Helmholtz-Zentrum Berlin (HZB), i.e., BESSY II, and at the bending beamline BL-20A of the Photon Factory, KEK.
3：List of Experimental Equipment and Materials:
A commercial McPherson 1 m normal-incidence spectrometer equipped with a gold-coated 1200 lines/mm grating was used for dispersed fluorescence experiments. For nondispersed fluorescence experiments, photon detectors incorporating MCPs with and without CsI coating were used.
4：Experimental Procedures and Operational Workflow:
Linearly polarized light was introduced into a gas cell fitted to the spectrometer. The fluorescence emitted perpendicular to the unit polarization vector of the linearly polarized incident light was dispersed and detected.
5：Data Analysis Methods:
The count rates for each channel of the position sensitive detector were normalized for the total gas pressure and incident photon flux and corrected for the sensitivity of the fluorescence spectrometer and detector.
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