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2. Spectroscopic Measurement of the Nuclear Spin and Magnetic Moment of ^39Ar†

Author

Traub, W., Roesler, F. L., Robertson, M. M., and Cohen, V. W.

Abstract

The nuclear spin and magnetic moment of argon 39 have been determined by high-resolution optical spectroscopy, using a pressure-swept Fabry–Perot interferometer, photoelectric detection, and digital data processing. The ^39Ar was produced through the ^39K(n,p)^39Ar reaction by pile neutron irradiation of KF. The spectrum of ^39Ar was excited in a miniature hollow cathode cooled by liquid nitrogen. Helium was used as a carrier gas. By application of the intensity rules, the nuclear spin was determined to be 72, in agreement with the shell model. Anomalous spin values which were measured from some lines were shown to be caused by self-absorption from excited states. Using the A value of −23.76 ± 0.04 mK (1 mK = 10^−3 cm^−1) measured for the 1s_2 level and the previous result for ^37Ar the nuclear magnetic moment has been determined to be −1.3 ± 0.3 nuclear magnetons. The measured B value for the 1s_2 level is B = +2.80 ± 0.02 mK. Several level structures and isotope shifts are reported.

Published
1967

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