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We experimentally show that the N-H bond cleavage in pyrrole moleculefollowing resonant electron attachment is allowed and controlled by the motionof the atoms which are not dissociating, namely of the carbon-attached hydrogenatoms. In order to interpret these findings, we have developed a method forlocating all resonant and virtual states of an electron-molecule system in thecomplex plane, based on all-electron R-matrix scattering calculations. Mappingthese as a function of molecular geometry allows us to separate twocontributing dissociation mechanisms: a $\pi^*$ resonance formation inducingstrong bending deformations and a non-resonant $\sigma^*$ mechanism originatingin a virtual state. The coupling between the two mechanisms is enabled by theout-of-plane motion of the C-H bonds and we show it must happen on an ultrafastfew-fs timescale.

Coupling of distant parts of pyrrole molecule through virtual and resonant states