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The infra red absorp tion spectra of se ve n cyclopentane a nd fi ve cyclohexanes have been measured i n t he region from 2 to 15 microns. The substances were cyclopen tane, m e thylcyclopen tane, 1, I-dimethylcyclopen tane, tmns-l ,2-di methylcyclopen tane, trans-I , 3-dimeth ylcyclopen tane, cisl ,2-d imethylcyclopentane, a nd cis, tmns, cis-l ,2,4trimethy lcyclopentane, also cyclohexane, meth ylcyclohexane, 1, I-dimethylcyclohexa ne, lmns-l ,2dimethylcyclohexane, and cis-l,2-dimethylcyclohexane. The wavelengths of all t he obse rved absorp tion bands are g ive n in a table, and a graph is shown of the percen tage t ransmission over the wave length reg ion of each substance. The hydrocarbons were highl y purified in the C hemi t ry Division and these spectra will be of value as a check on the puri ty of t hese compounds which may be ob ta ined from other sources. Also t he more intense bands serve as a mea ns of ident ifi ca t ion. For each substance t he bands that are best suited fo r distinguishing it a re noted . Of special in te res t are the four dimethylcyclopen tanes which we re studied. The struct ural posit ions of t he substit u ted methyl groups differ only sligh tly, bu t the spectral d iffe rence is q ui te mar ked. The infra red ahsorp tion spectra a re we ll sui ted to show characteristic differences between isomers. The measuremen ts were made with a Perkin -Elmer spectromete r wi th a Gene ral Motor amplifier and Brown recorder. A sli t co ntrol mecha nism is described in detail. Although t he slit control gear arrangement is relatively simple, the results obtained wi th i t aloe good, The energy outpu t is held nearly constant from 3.5 to 14.5 m icrons .

Infrared absorption spectra of seven cyclopentanes and five cyclohexanes