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12.05.2016 16:02

Angle-Resolved Auger Spectroscopy as a Sensitive Access to Vibronic Coupling

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 CH4 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.

A. Knie, M. Patanen, A. Hans, I. D. Petrov, J. D. Bozek, A. Ehresmann, Ph. V. Demekhin, Phys. Rev. Lett. 116, 193002 (2016)