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Related Experiment Videos

Dynamic stabilization in 1sigma(u)-->1pi(g) excited nitrogen clusters.

R Flesch1, A A Pavlychev, J J Neville

  • 1Fachbereich Physik, Universität, Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany.

Physical Review Letters
|May 1, 2001
PubMed
Summary

Researchers observed a slight redshift in nitrogen clusters

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Molecular nitrogen (N2) spectroscopy provides fundamental insights into chemical bonding and electronic structure.
  • Understanding nitrogen clusters is crucial for modeling atmospheric phenomena and chemical processes.
  • Synchrotron radiation enables high-resolution studies of electronic excitations in molecules and clusters.

Purpose of the Study:

  • To investigate the 1s near-edge X-ray absorption fine structure (XAFS) of molecular nitrogen and nitrogen clusters.
  • To analyze the core-to-valence electronic excitations in N2 molecules within clusters.
  • To determine the influence of cluster formation on the electronic and vibrational properties of N2.

Main Methods:

  • High-resolution 1s near-edge X-ray absorption spectroscopy was performed on molecular nitrogen and variable-size nitrogen clusters.

Related Experiment Videos

  • Monochromatic synchrotron radiation from the BESSY-II storage ring was utilized for excitation.
  • Vibrational resolution was achieved to analyze spectral features.

    • Main Results:

    • A distinct redshift of 6+/-1 meV was observed in the 1sigma(u)-->1pi(g) core-to-valence excitation band of nitrogen clusters compared to isolated N2 molecules.
    • The vibrational structure and linewidths of the excitation band remained largely unchanged in the clusters.
    • The observed spectral shift was attributed to dynamic stabilization of excited molecules within the cluster environment.

    Conclusions:

    • Core-hole localization in the low-symmetry cluster field induces a dynamic dipole moment, leading to stabilization of excited N2 molecules.
    • Intermolecular interactions in nitrogen clusters are altered upon electronic excitation compared to the ground state.
    • The observed spectral shifts are anticipated to be a general phenomenon in molecular clusters and condensed phases.