Determination of mean inner potential of germanium using off-axis electron holography.
Off-axis electron holography has been used to determine the mean inner potential of germanium using cleaved 90 degrees wedge samples, where the wedge thickness profiles were checked by weak-beam dark-field extinction fringes. Dynamical contributions to the phase of the image were minimized by tilting to weakly diffracting conditions, as confirmed by reference to convergent-beam electron diffraction patterns. Small residual corrections were determined using multislice calculations. From a total of 18 separate measurements, it is concluded that the value of the mean inner potential is 14.3(2) V, which agrees with recent theoretical calculations to within experimental error.
Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504, USA. jing.li@asu.edu
J
Li
MR
McCartney
RE
Dunin-Borkowski
DJ
Smith