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Effects of molecular potential and geometry on atomic core-level photoemission over an extended energy range: The case study of the CO molecule

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  • We report an experimental and theoretical study of single-molecule inner-shell photoemission measured over an extended range of photon energies. The vibrational intensity ratios I (nu = 1)/I (nu = 0) from the C 1s photoelectron spectra of carbon monoxide, although mostly determined by the bond length change upon ionization, are shown to be affected also by photoelectron recoil and by scattering from the neighboring oxygen atom. Static-exchange density functional theory (DFT) is used to encompass all these effects in a unified theoretical treatment. The ab initio calculations show that the vibrational ratio as a function of the photoelectron momentum is sensitive to both the ground-state internuclear distance and its contraction upon photoionization. We present a proof-of-principle application of DFT calculations as a quantitative structural analysis tool for extracting the dynamic and static molecular geometry parameters simultaneously.
  • Keywords: Diffraction, Photoelectron spectra, Vibrational structure, Photoionization
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  • Kukk, E., Travnikova, O., Mondal, S., Kimura, M., Sakai, K., Miron, C., . . . Kooser, K. (2013). Effects of molecular potential and geometry on atomic core-level photoemission over an extended energy range: The case study of the CO molecule. Physical Review A, 88(3) doi:10.1103/PhysRevA.88.033412
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  • 88
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  • 3
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  • This work was supported by the FP7/2007-2013 Grant No. 252781 (OT) and Triangle De la Physique Contract No. 2007-010T (OT), and by the MEXT and JSPS agencies (Japan). E.K. acknowledges financial support from the Academy of Finland. E.P., L.A., D.A., A.P., and F.M.acknowledge financial support from the Advanced Grant of the European Research Council XCHEM 290853, the MICINNProjects No. FIS2010-15127, No. ACI2008-0777, and No.CSD 2007-00010 (Spain), the ERA-Chemistry Project No.PIM2010EEC-00751, the European rants MC-ITN CORINFand MC-RG ATTOTREND, and the European COST Action No. CM0702 (CUSPFEL) and No. CM1204 (XLIC).
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