Tomographic spectroscopic imaging; an experimental proof of concept.
Recording the electron energy loss spectroscopy data cube with a series of energy filtered images is a dose inefficient process because the energy slit blocks most of the electrons. When recording the data cube by scanning an electron probe over the sample, perfect dose efficiency is attained; but due to the low current in nanoprobes, this often is slower, with a smaller field of view. In W. Van den Broek et al. [Ultramicroscopy, 106 (2006) 269], we proposed a new method to record the data cube, which is more dose efficient than an energy filtered series. It produces a set of projections of the data cube and then tomographically reconstructs it. In this article, we demonstrate these projections in practice, we present a simple geometrical model that allows for quantification of the projection angles and we present the first successful experimental reconstruction, all on a standard post-column instrument.
Van den Broek
W
W
EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium. wouter.vandenbroek@ua.ac.be
Verbeeck
J
J
Schryvers
D
D
De Backer
S
S
Scheunders
P
P