Theory of laser magnetometers

Abstract

This instrument is a development of the peiidulum mag-iietometer f o r the ineasurenient of saturation inagnetizarion: it has been found especially useful for exploratory work on new materials: since the test samples it requires are sinal1 and of simple shape.The specimen is attached to the end of a flat nonmagnetic spring, niaintained in continuous vibration in a non-uniform magnetic jield: by observing the sesonant fiequency wffh and without the field, the magnefization can be calculated by comparison with a reference samyle.Accuracies of about 1 % can be obtained on materials with speci;ic magnetizations of 50 e.in.v. ~ wiiile the loner h i t of usefulness of the instrument is determined priinariiy by the accuracy required. The device is iobust, inexpensive to construct and, in its present forin, may be used j70m rooin teniperature up to 490" C.

Pair production and vacuum polarization of vector particles with electric dipole moments and anomalous magnetic moments

“…so that ∂ µ θ µα = 0; ϕ(x) = ϕ + (x)β 4 , ϕ + (x) is the Hermitian-conjugate wave function. It is easy to verify that the quantity (20) is also conserved in the boson case (see also [28]), when the fields are given by Eqs. (6), (12).…”

“…Adding and subtracting equations (1)-(3) we get equations (4), (5). The self-dual tensor M µν which obeys the equations (4) is transformed under (1, 0)-representation of the Lorentz group and has 3 independent components (see also [28]). Equations (4) are not invariant under the parity transformation and there is no Lagrangian formulation of them.…”