When a nucleus captures a low energy neutron it emits a gamma ray as it recoils. The recoil energy is often sufficient to break a covalent bond to the atom concerned. The effect is known as a Szilard-Chalmers (SC) reaction. We propose to use neutron Compton scattering (NCS) on Vesuvio to systematically examine how well the adiabatic and harmonic approximation works for the quantum mechanical description of bond breaking using the SC reaction. Vesuvio offers a unique opportunity here as it operates at electron volt range of energy transfer from neutrons where gamma resonances (GR) by a most nuclei are very well resolved in forward scattering owing to YAP detectors. GRs of I-127 in three alkyl halides containing methyl iodide, ethyl iodide and 1-propyl iodide will be measured and compared and contrasted using model free methods - Gram-Charlier expansion and Self Modelling Curve Resolution.