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| Keywords: SpectroscopyResearch 009.jpg The infrared spectrometer lower center was usd at NBS for the qualitative and wuantitative analysis of mixtures of gases and the estimation of impurities in organic compounds The intensity of infrared radiation selectively absorbed by the different atomic groups in the molecules was indicated on the strip chart recorder right as the wavelength of the radiation was changed continuously and automatically The resulting absorption spectrum was then subjected to measurement and interpretation National Institute of Standards and Technology 10/6/1948 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Spectroscopy | ||||
