High resolution X-ray photoelectron spectroscopy on nitrogen molecules |
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Authors: | K Ueda R Püttner N A Cherepkov F Gel’mukhanov M Ehara |
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Institution: | 1. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577, Japan 2. Institut für Experimentalphysik, Freie Universit?t Berlin, Arnimallee 14, 14195, Berlin, Germany 3. State University of Aerospace Instrumentation, 190000, St. Petersburg, Russia 4. School of Biotechnology, Royal Institute
of Technology, 106 91, Stockholm, Sweden 5. Institute for Molecular Science, Okazaki, 444-8585, Japan
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Abstract: | This paper summarizes recent developments for experimental and theoretical studies on core-level
photoelectron spectroscopy of N2. Analysis of experimental spectra reveals that the 1σg and
1σu core-hole states differ in energy by ~100meV and in equilibrium bond length by ~0.04pm,
in agreement with ab initio predictions. The ratio of the 1σg and 1σu photoionization cross sections
measured in the photon energy range up to 1 keV reveals oscillatory structure due to two-center interference, equivalent to
Young’s
double-slit experiment, as Cohen and Fano predicted. The experimental Auger rates for the transition to the dicationic ground
state
are found to be different by a factor of two for 1σg and 1σu hole states and are well reproduced by the
ab initio calculations. All these findings support the delocalized picture of the core hole. Discussion is given how many-body
processes involved and observations for these processes affect the observation of the localized and/or delocalized core hole. |
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