Physical Review LettersComment on ‘‘Ionization of Rydberg atoms by a circularly polarized microwave field’’Michael NauenbergPublished May 28, 1990• 36 citationsPublisherAbstractA Comment on the Letter by Fu et al., Phys. Rev. Lett. 64, 511 (1990).Received 13 February 1990DOI:https://doi.org/10.1103/PhysRevLett.64.2731©1990 American Physical SocietyDOI10.1103/physrevlett.64.2731