Artru, X. (2011) Unitarity bound on the energy loss by a charged particle travelling near a periodic radiator. Il nuovo cimento C, 34 (4). pp. 2936. ISSN 18269885

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Abstract
The linear energy loss, or braking force, dW/dz of a charged particle passing at constant distance b from a semiinfinite inhomogeneous or periodic medium is related to the reflection coefficient R of an evanescent wave. Assuming that R < 1 as for an ordinary wave, a bound dW/dz ≤ Z2/(2π × 137 b2), in natural units, is obtained. Detailed bounds are also obtained for the frequency and angular spectrum of the SmithPurcell and Cherenkovatdistance radiations. Some examples in favor of the prolongation of R < 1 for evanescent waves, as well as some examples rising doubts about it, are presented.
Item Type:  Article 

Uncontrolled Keywords:  Classical electromagnetism, Maxwell equations ; Radiation by moving charges ; Cherenkov radiation 
Subjects:  500 Scienze naturali e Matematica > 530 Fisica 
Depositing User:  Marina Spanti 
Date Deposited:  07 Apr 2020 15:47 
Last Modified:  07 Apr 2020 15:47 
URI:  http://eprints.bice.rm.cnr.it/id/eprint/17300 
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