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Microscopy and Microanalysis Microscopy and Microanalysis

Article contents

Diffraction Imaging in a He+ Ion Beam Scanning Transmission Microscope

Published online by Cambridge University Press:  31 August 2010

John Notte IV ,
Raymond Hill ,
Sean M. McVey ,
Ranjan Ramachandra ,
Brendan Griffin  and
David Joy
John Notte IV
Affiliation:
Carl Zeiss SMT Inc., One Corporation Way, Peabody, MA 01960, USA
Raymond Hill
Affiliation:
Carl Zeiss SMT Inc., One Corporation Way, Peabody, MA 01960, USA
Sean M. McVey
Affiliation:
Carl Zeiss SMT Inc., One Corporation Way, Peabody, MA 01960, USA
Ranjan Ramachandra
Affiliation:
Center for NanoPhase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6496, USA
Brendan Griffin
Affiliation:
Center for NanoPhase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6496, USA Centre for Microscopy, Characterization and Analysis (M010), University of Western Australia, Crawley, WA 6009, Australia
David Joy
Affiliation:
Center for NanoPhase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6496, USA Electron Microscopy Facility, University of Tennessee, Knoxville, TN 37996-0840, USA
Corresponding
E-mail address:
djoy@utk.edu
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Abstract

The scanning helium ion microscope has been used in transmission mode to investigate both the feasibility of this approach and the utility of the signal content and the image information available. Operating at 40 keV the penetration of the ion beam, and the imaging resolution achieved, in MgO crystals was found to be in good agreement with values predicted by Monte Carlo modeling. The bright-field and annular dark-field signals displayed the anticipated contrasts associated with beam absorption and scattering. In addition, the diffraction of the He ion beam within the sample gave rise to crystallographic contrast effects in the form of thickness fringes and dislocation images. Scanning transmission He ion microscopy thus achieves useful sample penetration and provides nanometer scale resolution, high contrast images of crystalline materials and crystal defects even at modest beam energies.

Keywords

helium ion beams scanning transmission microscopy Monte Carlo modeling ion diffraction
Type
STEM Development and Applications
Information
Microscopy and Microanalysis , Volume 16 , Issue 5 , October 2010 , pp. 599 - 603
Copyright
Copyright © Microscopy Society of America 2010

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References

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