K. P. Singh [Phys. Rev. E 69, 056410 (2004)] put forward a scheme of vacuum laser acceleration in a static magnetic field. We point out that one of the assumptions used in their model does not stand on a solid physical ground and that it seriously influences electrons to obtain net energy gains from the laser field.
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Gwangju Inst Sci & Technol, APRI, Kwangju 500712, South Korea
Korea Electrotechnol Res Inst, Chang Won 641120, Kyongnam, South KoreaGwangju Inst Sci & Technol, APRI, Kwangju 500712, South Korea
Hur, Min Sup
Gupta, Devki Nandan
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Gwangju Inst Sci & Technol, Sch Photon Sci & Technol, Kwangju 500712, South KoreaGwangju Inst Sci & Technol, APRI, Kwangju 500712, South Korea