Abstract

With enhanced samples of the eight isotopes of cadmium in electrodeless discharge tubes, measurements of the center of gravity line position of λ6438 have been made to better than one part in 25 million or to about 0.0003 A. The estimated resolution, based on Doppler broadening, was 500 000. The observed shifts, compared to a similar normal cadmium source, have been treated by a least squares analysis of a matrix multiplication by the ORACLE. These preliminary results indicate a difference for the extreme masses of about 0.008 A, which is comparable with the half-width of the red line in an atomic beam source. With the exception of mass 108, there is a regular increase in wavelength for the even mass numbers. The odd mass isotopes appear to give anomalous shifts, falling near the shift for the adjacent larger even mass. The principal source of error in the procedure is associated with apparent shifts due to differences in density of the patterns.

© 1956 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Primary Standard of Length

K. M. Baird and D. S. Smith
J. Opt. Soc. Am. 52(5) 507-514 (1962)

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

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

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (7)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription