1. Probing the potential energy surface by high-resolution x-ray absorption spectroscopy : The umbrella motion of the core-excited CH3 free radical
- Author
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M. Alagia(1-2), M. Lavollee, R. Richter, U. Ekstrom, V. Carravetta (6), D. Stranges, B. Brunetti(1), S. Stranges, Laboratoire d'interaction du rayonnement X avec la matière (LIXAM), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
NEXAFS ,experiment ,[PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph] ,umbrellalike vibration ,Physics::Atomic and Molecular Clusters ,radical CH3 ,Physics::Chemical Physics ,theory - Abstract
A detailed study of the umbrellalike vibration in inner-shell spectroscopy is presented. The high-resolution x-ray absorption spectrum for the lowest lying core excitation of the CH3 free radical was recorded. High quality potential energy surfaces (PES) for the initial and final states of the transition were calculated as a function of the symmetrical stretching and the umbrella deformation coordinates. The strong anharmonicity along the umbrella coordinate in the double-well region of the PES of the core excited state has a strong effect on the bending vibrational progressions. The excellent agreement between the experiment and theory allows an accurate spectroscopic characterization of the vibrational structure of the electronic transition, and the estimation of the umbrella inversion time of 149 fs.
- Published
- 2007
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