title: Angle-Resolved Auger Spectroscopy as a Sensitive Access to Vibronic Coupling.
abstract: In the angle-averaged excitation and decay spectra of molecules, vibronic coupling may induce the usually weak dipole-forbidden transitions by the excitation intensity borrowing mechanism. The present complementary theoretical and experimental study of the resonant Auger decay of core-to-Rydberg excited CH_{4} and Ne demonstrates that vibronic coupling plays a decisive role in the formation of the angle-resolved spectra by additionally involving the decay rate borrowing mechanism. Thereby, we propose that the angle-resolved Auger spectroscopy can in general provide very insightful information on the strength of the vibronic coupling.
authors.affiliation: Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Knie
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur Yvette Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Patanen
authors.affiliation: Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Hans
authors.affiliation: Rostov State Transport University, Narodnogo Opolcheniya Square 2, 344038 Rostov-on-Don, Russia.|Research Institute of Physics, Southern Federal University, Stachki Avenue 194, 344090 Rostov-on-Don, Russia.
authors.forename: I D
authors.initials: ID
authors.lastname: Petrov
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur Yvette Cedex, France.
authors.forename: J D
authors.initials: JD
authors.lastname: Bozek
authors.affiliation: Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Ehresmann
authors.affiliation: Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.|Research Institute of Physics, Southern Federal University, Stachki Avenue 194, 344090 Rostov-on-Don, Russia.
authors.forename: Ph V
authors.initials: PV
authors.lastname: Demekhin