电子束沿多层膜表面运动时会产生自发辐射。分析自发辐射的精确波长公式、自发辐射中电子束品质的变化规律和电子自发辐射的功率后得出:电子束沿金属-介质多层膜表面运动时产生自发辐射,电子束内各种速度的电子数都按指数规律变化,实际电子束自发辐射的总辐射功率与金属-介质多层膜的空间周期成反比。 Electron beams move spontaneously along the surface of the multilayer film. The analysis of the exact wavelength formula of spontaneous emission, the variation of electron beam quality in spontaneous emission and the power of spontaneous emission of electrons leads to the spontaneous emission of electron beam along the surface of metal-dielectric multilayer film, The number of electrons varies exponentially, and the total radiant power of the spontaneous emission of the actual electron beam is inversely proportional to the spatial period of the metal-dielectric multilayer.