Abstract
ACCURATE, infrared, frequency and wavelength measurements now constitute the best means of determining the speed of light, and provide a link between the standards of length and time. We measured the frequency of the methane-stabilised He–Ne laser at 3.39 µm, and found good agreement with the result obtained by Evenson et al.1. The methane frequency was related to the caesium standard by using both the R(12) transition of CO2 at 9.3 µm, which has already been measured2, and the R(32) transition of CO2 at 10.17 µm.
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References
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BLANEY, T., BRADLEY, C., EDWARDS, G. et al. Measurement of the frequency of the methane-stabilised laser at 3.39 µm and of the R(32) transition of CO2 at 10.17 µm. Nature 254, 584–585 (1975). https://doi.org/10.1038/254584a0
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DOI: https://doi.org/10.1038/254584a0
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