title: Comment on "Electron acceleration by an intense short pulse laser in a static magnetic field in vacuum".
abstract: 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.
authors.affiliation: Department of Physics, Zhejiang Normal University, Zhejiang 321004, China. shihuahuang@163.com
authors.forename: Shihua
authors.initials: S
authors.lastname: Huang
authors.forename: Fengmin
authors.initials: F
authors.lastname: Wu