Interference fringes observed in electron emission patterns of a multi-wall carbon nanotube

Field electron emission patterns from a MWNT with clean surface exhibit fine structures originating from pentagons located at the tip end. The field emission microscopy (FEM) has resolved six pentagons each of which has a small dark spot in its center. Moreover, the bright streaks have been observed at the boundary regions between adjacent pentagons. By calculations based on the formula of Young´s interference of two beams, Oshima et al. (2002) reported that the observed streaks are interference fringes. In this paper, we show experimental results to prove that the streaks are Young´s interference fringes.