Helikonoszillationen in indium

Resonances of a Small Plasma Sphere in a Magnetic Field

“…(15) has real roots, as we increase the sphere radius this equation is not valid, and the resonance frequency, obtained as a solution of Eq. (13), becomes complex, the sphere radiates at resonance, and the resonance line is broadened.…”

“…(It is this mode of propagation which has been referred to as "helicon" waves 10 and observed in InSb, 11 sodium, 12 and other metals. 13 ) Clearly, the treatment used in the previous section is no longer valid. In spite of the fact that an element of the dielectric constant tensor is a large negative number, one might expect electromagnetic resonance modes to exist when khR> 1.…”

“…For the magnetic modes we have = [ftoRA» (1) (AoR)]7*n (1) (ft«»R). (13) Since koR<£l we expand the right-hand side of Eqs. (10) and (13) and the conditions for resonance become…”

“…These resonances are closely related to the "helicon" waves and resonances, which have been discussed recently. [10][11][12][13] We have not solved this boundaryvalue problem, but it appears that an assumption of an effective scalar dielectric constant fits the experiments surprisingly well. The lowest resonant mode observed in this case behaves very much like a magnetic dipole precessing about the applied magnetic field.…”

Electromagnetic Waves in Metals in a Magnetic Field

“…Substituting (1.18) in (1.17) we can readily show that if to > (1.20) there exist in the metal two weakly-damped waves with a spectrum given by the formula'-9 -' where ,-1/2 (1.21) (1. 22) is the carrier Alfven velocity.…”