Abstract

To date 268 even and 255 odd atomic energy levels in Th i have been found. The lowest level of the configuration 5f 6d 7s2 is 3H40 and lies 7795.27 cm−1 above the ground level 3F2 of 6d2 7s2. Some levels of 5f 6d2 7s and 6d2 7s 7p are identified.

© 1968 Optical Society of America

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