Improved techniques have made it possible to increase the absolute and relative accuracy of wavelength measurements in the near infrared. Thirty lines of the 002–000 band of HCN have been measured and used to determine upper and lower state constants. The values in cm−1 are: B″=1.478218, B′=1.457069, D″=2.9137×10−6, D′=2.8637×10−6, and ν0=6519.6135. These values, when combined with microwave measurements, give for the velocity of light c=299 793.2±1.8 km/sec.
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Rank et al. (1957) studied this question.
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