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Electromagnetic momentum in frontiers of modern
physics
SPAVIERI Gianfranco, ERAZO Jesús, SANCHEZ Arturo, AGUIRRE Felix, GILLIES George T., RODRIGUEZ Miguel
Frontiers of Physics in China - Selected Publications from Chinese Universities. 2008, 3 (3): 239-249.
https://doi.org/10.1007/s11467-008-0036-9
We review the role of the momentum of the electromagnetic (EM) fields Pe in several areas of modern physics. Pe represents the EM interaction in equations for matter and t waves propagation. As an application of wave propagation properties, a first order optical experiment which tests the speed of light in moving rarefied gases is presented. Within a classical context, the momentum Pe appears also in proposed tests of EM interactions involving open currents and angular momentum conservation laws.Moreover, Pe is the link to the unitary vision of the quantum effects of the Aharonov-Bohm (AB) type and, for several of these effects, the strength of Pe is evaluated. These effects provide a quantum approach to evaluate the limit of the photon mass mph. A new effect of the AB type, together with the scalar AB effect, provides the basis for table-top experiments which yield the limit mph = 9.4 × 10-52 g, a value that improves the results achieved with recent classical and quantum approaches.
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Theory of the resonance escape factors of plasma
resonance lines basing on the exact Voigt profile
ZHANG Qing-guo, HE Jian
Frontiers of Physics in China - Selected Publications from Chinese Universities. 2008, 3 (3): 264-268.
https://doi.org/10.1007/s11467-008-0020-4
In this paper, based on the exact Voigt profile we obtained, we derive the theory of resonance escape factors of plasma resonance lines, for both Lorentzian profile and Voigt profile. The oscillator strength, the number density of the absorbing atoms in the ground state, and the optical depth in the line center are discussed. As an example, the helium He I 1083.0 nm, lithium Li I 670.970 nm and carbon C I 111.74 nm are discussed for infrared, visible and ultraviolet regions. The results we calculated are in good agreement with the experimental results. These calculations will be significant in the theoretical analysis of plasma.
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