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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2016 ; 7
(ä): 12532
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Simultaneous atomic-resolution electron ptychography and Z-contrast imaging of
light and heavy elements in complex nanostructures
#MMPMID27561914
Yang H
; Rutte RN
; Jones L
; Simson M
; Sagawa R
; Ryll H
; Huth M
; Pennycook TJ
; Green ML
; Soltau H
; Kondo Y
; Davis BG
; Nellist PD
Nat Commun
2016[Aug]; 7
(ä): 12532
PMID27561914
show ga
The aberration-corrected scanning transmission electron microscope (STEM) has
emerged as a key tool for atomic resolution characterization of materials,
allowing the use of imaging modes such as Z-contrast and spectroscopic mapping.
The STEM has not been regarded as optimal for the phase-contrast imaging
necessary for efficient imaging of light materials. Here, recent developments in
fast electron detectors and data processing capability is shown to enable
electron ptychography, to extend the capability of the STEM by allowing
quantitative phase images to be formed simultaneously with incoherent signals. We
demonstrate this capability as a practical tool for imaging complex structures
containing light and heavy elements, and use it to solve the structure of a
beam-sensitive carbon nanostructure. The contrast of the phase image contrast is
maximized through the post-acquisition correction of lens aberrations. The
compensation of defocus aberrations is also used for the measurement of
three-dimensional sample information through post-acquisition optical sectioning.