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 AmericaFull Article | PDF Article
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