We have observed interference fringes of electrons in field emission patterns from multiwalled carbon nanotubes at 60 K. The observed fringe pattern is reproduced by calculations based on the formula of Young's interference of two beams. Three-beam interference has also been detected over short time periods. We discuss the reason why Young's interference appears in the electron emission pattern in accelerating fields.

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We have measured energy spectra of field emission (FE) electrons from multiwalled carbon nanotubes in various conditions such as a tip temperature, electric fields, the emission direction, and adsorption. The observed spectra indicated that peak near EF originated from the FE electrons from the inner walls, while FE electrons forming the shoulder at deeper energy came from a surface wall. Both the position and the intensity of the shoulder changed from one specimen to the others; no spectra were the same as the others. The Fermi level of the surface wall is different from that of the inner walls under the FE condition.

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