title: Atom-column distinction by Kikuchi pattern observed by an aberration-corrected convergent electron probe.
abstract: Kikuchi patterns of an MgO crystal at the [110] incidence have been taken by a sub-angstrom electron beam focused on the single atom-column. A significant change in intensity has been observed in the 111 band; that is, the contrast in the central and side bands is reversed depending on the illuminated atom-column. The contrast reversal in the 111 band has been reproduced by multislice simulation using the frozen-phonon approach. The beam-position dependence of the 111 band intensity can be interpreted by electron channelling and the reciprocity theorem. The anomalous Kikuchi pattern can be a probe for identifying the illuminated atom-column, which is useful for column-by-column electron energy-loss spectroscopy and X-ray emission spectroscopy.
authors.forename: Koh
authors.initials: K
authors.lastname: Saitoh
authors.forename: Yoshihide
authors.initials: Y
authors.lastname: Tatara
authors.forename: Nobuo
authors.initials: N
authors.lastname: Tanaka