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 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 , 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 1s2 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 1s2 level is B = +2.80 ± 0.02 mK. Several level structures and isotope shifts are reported.
© 1967 Optical Society of America
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