“…Because most vibrations of bromine and iodine can be found in the spectral region below 600 cm -1 , there are not very many studies in which these particular modes have been securely assigned. Thus, the training set used comprises the following 36 molecules: methyl bromide, bromoform, bromoethylene, 2,3-dibromopropene, acetyl bromide, 3-bromopropene, 1-bromo-2-methylpropane, bromobenzene, all- cis -1,2-dimethyl-3-bromocyclopropane, dibromomaleic anhydride, o -bromotoluene, propionyl bromide, 2-bromofuran, p -bromonitrobenzene, bromocyclohexane, p -bromotoluene, N -bromosuccinimide, 2,5-dibromofuran, p -bromophenol, bromocyclopentane, 1-bromopropane, methyl iodide, iodoethylene, trans -diiodoethylene, cis -diiodoethylene, p -iodonitrobenzene, iodocyclopentane, allyl iodide, 2-iodofuran, iodoethane, o -diiodobenzene, p -diiodobenzene, o -iodotoluene, p -iodotoluene, N -iodosuccinimide, and 2-iodopropane. , It was found to be necessary to introduce four new scaling factors for each halogen (Hal). These correspond to X−Hal stretchings, XY−Hal bendings and two kinds of torsions, where X and Y denote C, N, or O atoms.…”