Spectroscopic Study of the Br(−)+CH(3)I→I(−)+CH(3)Br S(N)2 Reaction

Mass spectrometry and anion photoelectron spectroscopy have been used to study the gas‐phase [Formula: see text] reaction involving [Formula: see text] and [Formula: see text] . The anion photoelectron spectra associated with the reaction intermediates of this [Formula: see text] reaction are presented. High‐level CCSD(T) calculations have been utilised to investigate the reaction intermediates that may form as a result of the [Formula: see text] reaction along various different reaction pathways, including back‐side attack and front‐side attack. In addition, simulated vertical detachment energies of each reaction intermediate have been calculated to rationalise the photoelectron spectra.