Abstract
HISTORICAL. IN the year 1800 the elder Herschel, by placing a thermometer in the region lying beyond the visible red of the solar spectrum, gave the first experimental proof of the existence of radiation there by observing a rise in temperature of the instrument, and his son in 1840 described the existence of emission bands in the same region as shown by a discontinuous evaporation of alcohol from blackened paper placed in the same region.
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ROBERTSON, R. Infra-red Spectra. Nature 123, 915–918 (1929). https://doi.org/10.1038/123915a0
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DOI: https://doi.org/10.1038/123915a0