Excitations of lithium ammonia complexes studied by inelastic x-ray scattering

C. A. Burns, G. Vankó, H. Sinn, A. Alatas, E. E. Alp, A. Said

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We have carried out high-resolution inelastic x-ray scattering measurements of the excitations of lithium dissolved in ammonia. The incident x-ray energy was 21.6 keV and the resolution was about 2 meV. Several different excitations are observed in the energy range of 0-60 meV (0-500 cm-1). In addition to acoustic phonons at low energies, we see excitations that are associated with vibrations of Li (N H3) 4+ complexes. We examined these excitations as a function of momentum transfer, lithium concentration, temperature, and state of the system (solid versus liquid). Data are compared with Hartree-Fock and density-functional theory calculations of the excitations of this complex, which agree well with the measured excitation energies.

Original languageEnglish
Article number024720
JournalJournal of Chemical Physics
Issue number2
Publication statusPublished - Jan 23 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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