Vacuum Wavenumber Research Articles

Wave-Lengths of Mercury 198

The wave-lengths of 26 visible and ultraviolet radiations from H80198g have been measured to eight figures relative to 5460.7532A, provisionally adopted for the green line. A water-cooled electrodeless lamp containing two milligrams of artificial H80198g served as a light source when excited with radio waves of 100 Mc frequency. This lamp illuminated a Fabry-Perot interferometer and a large quartz spectrograph with which the interference patterns were photographed. Measurements of these patterns yielded relative wave-lengths with probable errors usually less than 0.0001A. In addition to demonstrating that H80198g 5460.7532A provides a practically perfect primary standard of length, this paper presents preliminary values of 27 superior spectroscopic standards which show that differences among vacuum wave numbers recur within the accuracy of the measurements, and that all the existing dispersion curves for air are incorrect.

The Derivation of Vacuum Wave Numbers and the Reduction of Measured Wave Lengths to Standard Atmospheric Conditions.

view Abstract Citations (2) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Derivation of Vacuum Wave Numbers and the Reduction of Measured Wave Lengths to Standard Atmospheric Conditions. Babcock, Harold D. Abstract Vacuum wave numbers derived from Barrell and Sears's data on the refractivity of air are systematically lower than those found from Kayser's Schwingungszaklen. The differences are nonuniform to an extent that requires consideration in dealing with precise wave lengths. Effects of water vapor are illustrated. Tables are constructed from the data of Barrell and Sears for reducing wave lengths observed under nonstandard conditions to their values at 760 mm and 15 C. The new tables are compared with those of Meggers and Peters. Publication: The Astrophysical Journal Pub Date: January 1950 DOI: 10.1086/145239 Bibcode: 1950ApJ...111...60B full text sources ADS |