Pathways of relaxation of the N–H stretching vibration of pyrrole in liquids

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Abstract
The v=1, N–H vibrational excitations of pyrrole flow with high selectivity into ring breathing motions. The process is intermolecular, involving a coupling of H motion in one pyrrole with the π system of another pyrrole or benzene molecule in the solution. The inter‐ and intramolecular contributions to vibrational relaxation are experimentally distinguished.