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High-Order Resonances in the Water Molecule.

Bykov1, Naumenko, Sinitsa

  • 1SB, Institute of Atmospheric Optics, Tomsk, Russia

Journal of Molecular Spectroscopy
|January 10, 2001
PubMed
Summary

High-order resonances in water-vapor spectra were identified, revealing complex interactions between bending and stretching vibrations. These findings challenge traditional models of molecular vibrations in water molecules.

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Area of Science:

  • Molecular Spectroscopy
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Water vapor exhibits complex spectral patterns in the near-infrared and visible regions.
  • Understanding molecular vibrations is crucial for various scientific disciplines.

Purpose of the Study:

  • To find experimental evidence of unusual high-order resonance in water-vapor spectra.
  • To investigate interactions between high-bending and stretch vibration states in water molecules.

Main Methods:

  • Reanalysis of water-vapor spectra in the near-infrared and visible regions.
  • Assignment of approximately 70 transitions to specific bending states and their resonating partners.
  • Confirmation of assignments using combination differences and simultaneous observation of perturbed and perturbing levels.

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Main Results:

  • Experimental energy levels near or above the potential energy barrier to linearity were determined.
  • High-order resonances with significant changes in vibration quantum numbers were found to be typical for water molecules.
  • These resonances disrupt the standard polyad schemes caused by Coriolis, Darling-Dennison, and Fermi resonances.

Conclusions:

  • Strong centrifugal distortion near the linear configuration drives these high-order resonances in water.
  • The identified resonances significantly alter the understanding of molecular vibrational dynamics in H(2)O.
  • This study provides new insights into the complex vibrational behavior of water molecules.