Smith-Purcell radiation has a quantum energy threshold from conservation laws below which emission cannot occur and the electron backscatters, plus a classical threshold from the Duane-Hunt limit.
Broadband Enhancement of Cherenkov Radiation Using Dispersionless Plasmons,
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Energy threshold in Smith-Purcell radiation
Smith-Purcell radiation has a quantum energy threshold from conservation laws below which emission cannot occur and the electron backscatters, plus a classical threshold from the Duane-Hunt limit.