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Computing Hydrogen Tunneling Splittings with Nuclear-Electronic Orbital Multireference Configuration Interaction.

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The nuclear-electronic orbital-multireference configuration interaction (NEO-MRCI) method accurately calculates hydrogen and deuterium tunneling splittings. This quantum mechanical approach is crucial for understanding reaction rates and molecular spectra.

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Area of Science:

  • Quantum Chemistry
  • Chemical Physics

Background:

  • Hydrogen tunneling significantly influences chemical reaction rates and molecular spectra.
  • Accurate quantum mechanical treatment of transferring hydrogen is essential for understanding this phenomenon.

Purpose of the Study:

  • To implement and validate the nuclear-electronic orbital-multireference configuration interaction (NEO-MRCI) method for hydrogen tunneling systems.
  • To compute nuclear-electronic wave functions and vibronic energies for hydrogen tunneling.

Main Methods:

  • The study employed the NEO-MRCI method, which treats nuclei and electrons quantum mechanically at the same level.
  • This method incorporates static correlation for hydrogen tunneling and dynamic correlation for vibronic states.
  • Calculations were performed for four hydrogen tunneling systems at fixed geometries.

Main Results:

  • The NEO-MRCI method successfully computed nuclear-electronic wave functions and vibronic energies.
  • Results from NEO-MRCI were compared to numerically exact grid-based calculations.
  • The method demonstrated accuracy in calculating hydrogen and deuterium tunneling splittings at fixed geometries.

Conclusions:

  • The NEO-MRCI method provides accurate hydrogen and deuterium tunneling splittings at fixed geometries.
  • This work establishes NEO-MRCI as a valuable tool for studying hydrogen tunneling systems.
  • The findings contribute to a deeper understanding of quantum mechanical effects in chemical processes.