Inverse internal conversion in C4− below the electron detachment threshold

Abstract

Inverse internal conversion followed by recurrent fluorescence was observed as a fast decay (10 μs range) in the time profile of neutral yields from photo-excited C₄⁻ molecular ions. We also elucidated the contribution of such electronic radiative cooling to the C₄⁻ ions with internal energy far below the detachment threshold by an alternative novel approach, observing the laser wavelength and storage time dependence (ms range) of the total yield of the photo-induced neutrals.