Abstract

The primary standard of length is defined in terms of the unperturbed $2{\mathcal{p}}_{10}-5d_5$ radiation of Kr-86. This paper reports new measurements of the perturbations due to the conditions of excitation necessary for its practical realization. The results confirm that the present recommendation of the International Committee of Weights and Measures yields the defined standard to an accuracy of better than 1:10⁸ and they indicate how an improvement by about an order of magnitude may be realized by more exact specifications.

© 1962 Optical Society of America

A Light Source for the Primary Standard of Wave-Length*

Chao-Wang Hsueh
J. Opt. Soc. Am. 36(3) 160-164 (1946)

Wavelengths, Energy Levels, and Pressure Shifts in Mercury 198

Victor Kaufman
J. Opt. Soc. Am. 52(8) 866-870 (1962)

Problem of Realizing the Primary Standard of Light

C. L. Sanders and O. C. Jones
J. Opt. Soc. Am. 52(7) 731-746 (1962)

The International Length Standard

K. M. Baird and L. E. Howlett
Appl. Opt. 2(5) 455-463 (1963)

Germanium Vacuum Ultraviolet Ritz Standards*

Victor Kaufman and Kenneth L. Andrew
J. Opt. Soc. Am. 52(11) 1223-1237 (1962)