Abstract

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.

© 1957 Optical Society of America

Precision Determination of the Velocity of Light Derived from a Band Spectrum Method*†

D. H. Rank, R. P. Ruth, and K. L. Vander Sluis
J. Opt. Soc. Am. 42(10) 693-698 (1952)

Tertiary Interferometric Wavelength Standards from Measurements on Lines of the 2-0 Band of Carbon Monoxide and Derived Wavelength Standards for Some Lines of the 1-0 Band of Carbon Monoxide. The Velocity of Light Derived from a Band Spectrum Method. IV*

D. H. Rank, A. H. Guenther, G. D. Saksena, J. N. Shearer, and T. A. Wiggins
J. Opt. Soc. Am. 47(8) 686-689 (1957)

A Method of Determining Optical Cross Sections*†

Einar Hinnov
J. Opt. Soc. Am. 47(2) 151-155 (1957)

Secondary and Tertiary Interferometric Wavelength Standards in the 1.5–2.5 μ Region*

D. H. Rank, A. H. Guenther, J. N. Shearer, and T. A. Wiggins
J. Opt. Soc. Am. 47(2) 144-148 (1957)

Velocity of Light from the Molecular Constants of Carbon Monoxide

Earle K. Plyler, L. R. Blaine, and W. S. Connor
J. Opt. Soc. Am. 45(2) 102-106 (1955)