Abstract

Fifty-three emission-spectrum lines of einsteinium have been observed. The interval between the ground level 5I8 and the first excited level 3I7 of Es ii has been found to be 938.66 cm−1. The hyperfine structure confirms that the nuclear spin of 253Es is 72. A value of μI = (+5.1±1.3)μN was obtained for the nuclear magnetic dipole moment.

© 1970 Optical Society of America

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