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Time and frequency resolved dynamics of ArBr2.

Jose Cabrera1, Craig R Bieler, Natalie McKinney

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Summary

Spectroscopic observations reveal vibrational predissociation dynamics in Argon-Bromine (ArBr2) complexes. The T-shaped isomer

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Area of Science:

  • Chemical Physics
  • Molecular Spectroscopy
  • Quantum Dynamics

Background:

  • Argon-bromine (ArBr2) complexes are van der Waals molecules.
  • Understanding their vibrational predissociation dynamics is crucial for molecular physics.

Purpose of the Study:

  • To perform the first spectroscopic observation of ArBr2.
  • To investigate the vibrational predissociation (VP) dynamics of ArBr2 isomers.

Main Methods:

  • Time- and frequency-resolved spectroscopy using a 15 ps pulse.
  • Measurement of product appearance rates for various vibrational states.

Main Results:

  • Spectroscopic data obtained for linear and T-shaped ArBr2 isomers.
  • Determined Ar-Br2 bond energy for the T-shaped isomer (B state, nu'=19) as 200 cm(-1).
  • Observed non-monotonic increase in VP rates with vibrational quantum number.

Conclusions:

  • ArBr2 undergoes VP in the sparse intramolecular vibrational relaxation regime.
  • Lifetimes are strongly dependent on vibrational and rotational quantum numbers.
  • A linear isomer contributes a quasicontinuous background to excitation spectra.