Phys. Rev. Lett. 19, 219–222 (1967)Plasma Wave EchoReceived 29 May 1967; published in the issue dated 31 July 1967 It is shown that if a longitudinal wave is excited in a collision-free plasma and Landaudamps away, and a second wave is excited and also damps away, then a third wave (i.e., the echo) will spontaneously appear in the plasma. © 1967 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.19.219
DOI:
10.1103/PhysRevLett.19.219
PACS:
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