view article
Figure 2
Schematic view (a) and simulated electron trajectories (b,c) for the high-energy time-of-flight momentum microscope. Simulations for an initial kinetic energy of Ekin = 4 keV with an extractor field of 1 kV mm−1 (b) and Ekin = 8 keV at extractor field zero (c). The drift energy is 60 eV. Despite zero extractor field in (c) the k-image diameters are quite similar, 18 Å−1 (b) and 16 Å−1 (c). Three lens groups focus and decelerate the beam; an adjustable field aperture in a real image plane can serve for selection of the region of interest. Despite the large k-fields the isochrones surfaces are almost planar; blue dots are time markers (10 ns spacing). The right-hand side shows measured results for a graphite single crystal: a typical ToF spectrum of the carbon 1s core-level signal (a) and two Kikuchi-type photoelectron diffraction patterns taken near normal emission (b, detail of a larger pattern) and 30° off-normal (c).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 6| November 2019| Pages 1996-2012
https://doi.org/10.1107/S1600577519012773
Follow J. Synchrotron Rad.
Sign up for e-alerts
E-alerts
Follow J. Synchrotron Rad. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS