Phys. Rev. A 20, 2629–2630 (1979)Can beats of electron waves at optical frequencies drive a free-electron laser?Received 4 June 1979; published in the issue dated December 1979 A recent proposal by H. Schwarz is analyzed. General principles of quantum mechanics are used to limit the possibilities for radiation from beats in an electron beam. © 1979 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.20.2629
DOI:
10.1103/PhysRevA.20.2629
PACS:
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