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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
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Published on: July 27, 2018

Vibrational dynamics of the CH4·F- complex.

Robert Wodraszka1, Juliana Palma, Uwe Manthe

  • 1Theoretische Chemie, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany.

The Journal of Physical Chemistry. A
|June 27, 2012
PubMed
Summary

Investigating the vibrational dynamics of the methane-fluoride anion complex (CH(4)·F(-)) reveals minimal tunneling splittings. Calculations show lower frequencies for intermolecular modes compared to previous methods.

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Published on: July 27, 2018

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Area of Science:

  • Chemical Physics
  • Quantum Chemistry
  • Molecular Dynamics

Background:

  • Recent photodetachment experiments highlight resonance structures in the F + CH(4) reaction transition state.
  • Understanding the vibrational dynamics of the precursor complex CH(4)·F(-) is crucial for interpreting these experimental findings.

Purpose of the Study:

  • To compute the full-dimensionality vibrational eigenstates of the CH(4)·F(-) complex.
  • To investigate the tunneling splittings and vibrational frequencies within this complex.

Main Methods:

  • Utilized the multiconfigurational time-dependent Hartree (MCTDH) approach for accurate vibrational dynamics.
  • Employed a novel iterative diagonalization approach for general multiwell systems.
  • Applied stereographic coordinates and a general N-body kinetic energy operator.

Main Results:

  • Calculated tunneling splittings for the ground and lower excited vibrational states of CH(4)·F(-) are less than 1 cm(-1).
  • MCTDH results for localized excitations show significantly lower frequencies for intermolecular modes compared to normal-mode-based calculations.

Conclusions:

  • The vibrational dynamics of the CH(4)·F(-) complex are characterized by small tunneling splittings.
  • The study validates advanced computational methods for complex molecular systems and highlights discrepancies with simpler models for intermolecular modes.