Accurate measurement of the T-shaped and linear Ar ⋯ i 2 (X, ν' = 0) binding energies using vibronic-specific I 2(B, ν) fragment velocity-map imaging

Jie Wei, Camille Makarem, Ashley L. Reinitz, Joshua P. Darr, Richard A. Loomis

Research output: Contribution to journalArticle

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Abstract

Ion time-of-flight slow fragment velocity imaging (SFVI) is combined with laser-induced fluorescence spectroscopy measurements to accurately determine the binding energies of the T-shaped and linear conformers of the ground-state Ar⋯I 2(X, ν″=0) complex. The fluorescence-based measurements were used to optimize the conditions for preferentially stabilizing either the T-shaped or linear conformers, and to ensure proper excitation energetics for the SFVI experiments. In the ion-imaging experiments, the kinetic energy distributions of specific I 2(B, ν) fragments formed with very low kinetic energies via dissociation of initially prepared Ar⋯I 2(B, ν′) intermolecular vibrational levels were imaged to measure the binding energies of the linear and T-shaped conformers. The linear conformer is energetically preferred, with a binding energy of 250.3(2.7) cm -1, over the T-shaped conformer, with a binding energy of 240.5(3.6) cm -1. These values are compared with previously reported data from high-level ab initio calculations and experiments.

Original languageEnglish (US)
Pages (from-to)172-179
Number of pages8
JournalChemical Physics
Volume399
DOIs
StatePublished - May 3 2012

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Keywords

  • ArI
  • Binding energies
  • LIF
  • Laser-induced fluorescence
  • Rare gas-dihalogen complexes
  • SFVI
  • VMI
  • Van der Waals complexes
  • Velocity map imaging

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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