Abstract
The first energy interval of the 4f116s configuration of Ho ii was recently found by Spector and Sugar to be 637.8 cm−1. The hfs of four of the lines defining this interval have been measured with an HYPEAC spectrometer at a resolution of 600 000. Seven independent equations relating the splitting factors a6s, a4f, and b4f to the measured hfs were derived. Known values of a4f and b4f from Ho i (deduced in an atomic-beam magnetic-resonance experiment) were inserted in these equations, giving a6s = 0.4437 cm−1 (corrected for core polarization) with a probable error of 0.0004 cm−1. From a6s, a value for the nuclear magnetic dipole moment μI = (3.94±0.05)μN was derived. The uncertainty of μI is the rms deviation due to uncertainties of a6s, and ψ6s2(0), the value of the probability density of the 6s electron at the nucleus.
© 1968 Optical Society of America
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