The Transverse Momentum of an Electron in a Wave
نویسندگان
چکیده
When a charged particle (of mass m and charge e) interacts with a linearly polarized plane wave with electric field Ex = E0 cos(kz − ωt), the particle’s motion consists of a transverse oscillation. Hence, the particle has transverse momentum, while the wave carries only longitudinal momentum. How is Newton’s 3rd law satisfied in this situation? Hint: Consider the interaction field momentum. This problem may be analyzed in the frame in which the particle is at rest on average. The longitudinal oscillation is negligible if eE0/mωc 1, as may be assumed.
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