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Percent Transmittance

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    40860

    • The percent transmission, y axis of an infrared spectrum, is defined as follows.

    If the sample absorbs no light, I = Iο; percent transmittance = 100%. If the sample absorbs the light completely, I = 0; percent transmittance = 0. Thus, the greater the amount of light absorbed by the sample, the smaller the percent transmittance.