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- W4225147757 abstract "Abstract The dispute about whether the 1 s core-hole is localized on one atom or delocalized over both in a homonuclear diatomic molecule has continued for decades, which has been extensively studied by the photoelectron and electron–ion coincidence spectroscopies. For N 2 , if the 1 s core-hole is delocalized, the K-shell excitation into the 1 π g orbital should split into two components, i.e., the dipole-allowed transition from the ungerade 1 σ u state and the dipole-forbidden transition from the gerade 1 σ g state. However, only the dipole-allowed transition has been observed up to now. Here, we report the inner-shell electron energy loss spectra of N 2 at different scattering angles with an incident electron energy of 1500 eV and an energy resolution of 65 meV. The vibrational structures of both the dipole-allowed <?CDATA ${(1s{sigma }_{u})}^{-1}{(1{pi }_{g})}^{1}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:msup> <mml:mrow> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mrow> <mml:mn>1</mml:mn> <mml:mi>s</mml:mi> <mml:msub> <mml:mrow> <mml:mi>σ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>u</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> <mml:msup> <mml:mrow> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mrow> <mml:mn>1</mml:mn> <mml:msub> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>g</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> and dipole-forbidden <?CDATA ${(1s{sigma }_{g})}^{-1}{(1{pi }_{g})}^{1}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:msup> <mml:mrow> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mrow> <mml:mn>1</mml:mn> <mml:mi>s</mml:mi> <mml:msub> <mml:mrow> <mml:mi>σ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>g</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> <mml:msup> <mml:mrow> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mrow> <mml:mn>1</mml:mn> <mml:msub> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>g</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> states of N 2 have been identified at different momentum transfers. The splitting between the <?CDATA ${(1{sigma }_{g})}^{-1}{(1{pi }_{g})}^{1}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:msup> <mml:mrow> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mrow> <mml:mn>1</mml:mn> <mml:msub> <mml:mrow> <mml:mi>σ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>g</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> <mml:msup> <mml:mrow> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mrow> <mml:mn>1</mml:mn> <mml:msub> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>g</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> and <?CDATA ${(1{sigma }_{u})}^{-1}{(1{pi }_{g})}^{1}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:msup> <mml:mrow> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mrow> <mml:mn>1</mml:mn> <mml:msub> <mml:mrow> <mml:mi>σ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>u</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> <mml:msup> <mml:mrow> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mrow> <mml:mn>1</mml:mn> <mml:msub> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>g</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> states with the reverse symmetry is determined to be 67 ± 7 meV. Moreover, the momentum transfer dependence behavior of the transition intensity ratio agrees with the theoretical predictions, as increasing to a maximum and then decreasing. The experimental observations clearly show that the inner most electrons can be described by 1 σ g and 1 σ u , which indicates that the inner-shell 1 s core-hole of N 2 is delocalized over two N atoms based on the excitation process." @default.
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- W4225147757 date "2022-05-01" @default.
- W4225147757 modified "2023-09-26" @default.
- W4225147757 title "Probing the delocalized core-hole via inner-shell excitation in N<sub>2</sub>" @default.
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- W4225147757 doi "https://doi.org/10.1088/1367-2630/ac6bb7" @default.
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