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

作者：Wei Jie; Makarem Camille; Reinitz Ashley L; Darr Joshua P; Loomis Richard A^*

来源：Chemical Physics, 2012, 399: 172-179.

DOI：10.1016/j.chemphys.2011.06.039

• Van der Waals complexes
• Binding energies
• Velocity map imaging
• VMI
• SFVI
• Laser-induced fluorescence
• LIF
• ArI2
• Rare gas-dihalogen complexes

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,v '' = 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, m) fragments formed with very low kinetic energies via dissociation of initially prepared Ar . . . .I-2(B, v ') 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.

• 出版日期2012-5-3