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The spectra of 36 hydrocarbons have been recorded in the near infrared from 5,500 to 9,000 cm -1 (2/i to 1/x), using an automatic recording infrared glass spectrograph. Specific absorptive indices have been calculated from the results and plotted against wave numbers (wave lengths per centimeter). Correlations of the spectra of the various compounds have been made in regions associated with three energy transitions in the molecules. Characteristic differentiation of the compounds according to structural types has been indicated.
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Liddel et al. (1933) studied this question.
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