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The smallest proton-bound dimer H5+: theoretical progress.

Rita Prosmiti1, Álvaro Valdés2

  • 1Departamento PAMS, Instituto de Física Fundamental (IFF-CSIC), CSIC, Serrano 123, 28006 Madrid, Spain.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|August 6, 2019
PubMed
Summary

The protonated hydrogen dimer (H5+) is crucial for understanding proton transfer and molecular astrophysics. Recent quantum simulations reveal its complex vibrational dynamics, challenging traditional theoretical methods.

Keywords:
computational spectroscopyelectronic structure computationshydrogen clustersnuclearquantum treatmentspotential energy surfaces

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Area of Science:

  • Quantum chemistry
  • Molecular astrophysics
  • Spectroscopy

Background:

  • The protonated hydrogen dimer (H5+) is the smallest system exhibiting proton transfer, first observed in 1962.
  • H5+ and its isotopologues are key intermediates in deuterium fractionation reactions, vital for molecular astrophysics.
  • Recent infrared spectra of H5+ and D5+ show complex vibrational dynamics, posing challenges for theoretical models.

Purpose of the Study:

  • To report recent advances in computational vibrational spectroscopy of the H5+ cation and its isotopologues.
  • To provide rigorous information on the vibrational dynamics of H5+ through full quantum spectral simulations.
  • To explore the challenges and opportunities in theoretical treatments of large-amplitude motions in H5+.

Main Methods:

  • Ab initio electronic structure calculations for potential energy and dipole moment surfaces.
  • High-dimensional quantum mechanical treatment of nuclear motion.
  • Full quantum spectral simulations for vibrational spectroscopy.

Main Results:

  • Successful simulation of the vibrational spectra of H5+ and its isotopologues.
  • Detailed insights into the rich vibrational dynamics and large-amplitude motions.
  • Demonstration of the capability of state-of-the-art theoretical methods to treat floppy and symmetric systems.

Conclusions:

  • Computational vibrational spectroscopy provides rigorous insights into H5+ dynamics.
  • Advances in theoretical methods are crucial for understanding complex molecular ions.
  • Further investigations are needed to fully elucidate the behavior of H5+ and related systems.