Probing the potential energy surface by highresolution x-ray absorption spectroscopy: The umbrella motion of the coreexcited CH3 free radical

Alagia, M.ISMN-CNR, Sez. Roma1, P.le A. Moro 5, I-00185 Roma, Italy and TASC-CNR, Area Science Park, Basovizza, I-34012 Trieste, Italy (author)

Probing the potential energy surface by highresolution x-ray absorption spectroscopy : The umbrella motion of the coreexcited CH3 free radical

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.

Lavollée, M.LIXAM-CNRS, F-91898 Orsay-Cedex, France (author)
Richter, R.Sincrotrone Trieste, Area Science Park, I-34012 Basovizza, Trieste, Italy (author)
Ekström, UlfLinköpings universitet,Beräkningsfysik,Tekniska högskolan(Swepub:liu)ulfek05 (author)
Carravetta, V.Institute of Chemical Physical Processes (CNR), Via Moruzzi 1, I-56124 Pisa, Italy (author)
Stranges, D.Dipartimento di Chimica and INSTM, Universitá La Sapienza, P.le A. Moro 5, I-00185 Roma, Italy and ISMN-CNR, Sez. Roma1, P.le A. Moro 5, I-00185 Roma, Italy (author)
Brunetti, B.ISMN-CNR, Sez. Roma1, P.le A. Moro 5, I-00185 Roma, Italy (author)
Stranges, S.Dipartimento di Chimica and INSTM, Universitá La Sapienza, P.le A. Moro 5, I-00185 Roma, Italy; ISMN-CNR, Sez. Roma1, P.le A. Moro 5, I-00185 Roma, Italy; and TASC-CNR, Area Science Park, Basovizza, I-34012 Trieste, Italy (author)
ISMN-CNR, Sez. Roma1, P.le A. Moro 5, I-00185 Roma, Italy and TASC-CNR, Area Science Park, Basovizza, I-34012 Trieste, ItalyLIXAM-CNRS, F-91898 Orsay-Cedex, France (creator_code:org_t)

By the author/editor: Alagia, M.; Lavollée, M.; Richter, R.; Ekström, Ulf; Carravetta, V.; Stranges, D.; show more...; Brunetti, B.; Stranges, S.; show less...

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