Electronic structure effects from hydrogen bonding in the liquid phase and in chemisorption: An integrated theory and experimental effort

Lars G.M. Pettersson, Anders Nilsson, Satish Chandra Babu Myneni, Yi Luo, Mats Nyberg, Matteo Cavalleri, Lars Ojamäe, Lars Åke Näslund, Hirohito Ogasawara, Michael Odelius, Alexander Pelmenschikov

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

A closely integrated theoretical and experimental effort to understand chemical bonding using X-ray spectroscopic probes is presented. Theoretical techniques to simulate XAS (X-ray absorption spectroscopy), XES (X-ray emission spectroscopy), RIXS (resonant inelastic X-ray scattering) and XPS (X-ray photoelectron spectroscopy) spectra have been developed and implemented within a density functional theory (DFT) framework. In combination with new experimental techniques, such as high-resolution XAS on liquid water under ambient conditions and XES on complicated surface adsorbates, new insight into e.g. hydrogen-bonded systems is obtained. For the (3×2) overlayer structure of glycine/Cu(110), earlier work has been extended to include adsorbate-adsorbate interactions. Structures are optimized for large cluster models and for periodic boundary conditions. It is found that specific features in the spectra arise from hydrogen-bonding interactions, which thus have important effects at the molecular-orbital level. XAS on liquid water shows a pronounced pre-edge feature with significant intensity, while the spectrum of ice shows only little intensity in this region. Theoretical spectrum calculations, based on instantaneous structures obtained from molecular-dynamics (MD) simulations, show that the pre-edge feature in the liquid is caused by water molecules with unsaturated hydrogen bonding. Some aspects of the theoretical simulations will be briefly discussed.

Original languageEnglish (US)
Pages (from-to)136-140
Number of pages5
JournalJournal of Synchrotron Radiation
Volume8
Issue number2
DOIs
StatePublished - Mar 1 2001

All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

Keywords

  • Density functional theory (DFT)
  • Glycine/Cu(110)
  • Hydrogen bonding
  • Liquid XAS
  • Water

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