About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Publication
Physical Review
Paper
Magnetic moment of helium in Its S13 metastable state
Abstract
The ratio of the electronic gJ value of He in its 1s2s, S13 metastable state to the gJ of H in its ground state has been redetermined by the atomic beam magnetic resonance method using separated oscillating fields. At magnetic fields of about 540 and 575 gauss the transitions Δm=±1,±2 in He and (F,m)=(1,0)(1,-1) in H are observed at frequencies of approximately 1570 Mc/sec and 1140 Mc/sec, respectively. The natural line shapes for the separated oscillating fields method are obtained with spacings between the oscillating fields of both 4.2 cm and 2.2 cm. The experimental result is gJ(He,S13)gJ(H,S122)|exp=1-(23.3±0.8)×10-6, which agrees with an earlier measurement having an accuracy of 16 ppm, and also with the theoretical value gJ(He,S13)gJ(H,S122)|theor=1-(23.3±1.0)×10-6 obtained by Perl and Hughes, which was computed from the Breit equation for He with the addition of a term to represent the interaction of the anomalous spin magnetic moment of each electron with the external magnetic field. © 1958 The American Physical Society.