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With t he aid of new data on wavelengths, intensities, and t he Zeem an effect, t he structural analysis of the first spectrum of rhenium (Re I) has been extended to include 2,764 lines that are explained as transitions among 282 atomic en ergy levels. This analysis accounts for 90 percent of the total observed intensity, alt hough only 64 p ercent of t he t otal number of lines has been classified. From the Zeeman effect, magnetic splittin g fac t ors h ave been derived for 75 percent of the levels, and nearly 40 percent of t hese have been grouped into designated spectral terms ascribed to speci fic configurations of electrons. The normal state of neutral R e atoms is 5d 5 68 2 682», and t he ionization limit is approximately 63530 kaysers or 7.87 electron volts.

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