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Electron attachment to pyrrole allows N-H bond cleavage, controlled by non-dissociating C-H bonds. This discovery enables steering bond cleavage efficiency via molecular motion.

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Area of Science:

  • Physical Chemistry
  • Quantum Chemistry
  • Chemical Physics

Background:

  • Electron attachment to molecules can induce bond cleavage.
  • Understanding dissociation mechanisms is crucial for controlling chemical reactions.

Purpose of the Study:

  • To experimentally demonstrate and theoretically interpret N-H bond cleavage in pyrrole via electron attachment.
  • To investigate the role of molecular motion in controlling dissociation pathways.
  • To develop a method for analyzing electron-molecule resonant and virtual states.

Main Methods:

  • All-electron R-matrix scattering calculations to locate electron-molecule system states.
  • Experimental measurements of electron-induced dissociation.
  • Mapping resonant and virtual states as a function of molecular geometry.

Main Results:

  • N-H bond cleavage in pyrrole is experimentally shown to be allowed and controllable.
  • A new method accurately locates resonant and virtual states in the complex plane.
  • Two dissociation mechanisms, π* resonance and σ* virtual state, are identified and separated.
  • Out-of-plane C-H bond motion couples these mechanisms on an ultrafast timescale (femtoseconds).

Conclusions:

  • The motion of non-dissociating atoms, specifically C-H bonds, dictates N-H bond cleavage efficiency in pyrrole.
  • Ultrafast coupling between resonance and virtual state mechanisms is essential for dissociation.
  • This work provides a pathway to control bond cleavage through molecular dynamics.