Practical methods for the measurement of spatial coherence-A comparative study

C. Maunders; C. Dwyer; P. C. Tiemeijer; J. Etheridge

doi:10.1016/j.ultramic.2011.05.011

Practical methods for the measurement of spatial coherence-A comparative study

C. Maunders, C. Dwyer, P. C. Tiemeijer, J. Etheridge

Physics

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

Two new methods for the measurement of transverse spatial coherence in a transmission electron microscope (TEM) are developed and applied to measure the spatial coherence in a field emission gun TEM. Measurements are made under different illumination and operating conditions, illustrating the effect of these conditions on the spatial coherence. The relative merits and limitations of these methods are discussed and compared, together with the previously described "Ronchigram" method.

Original language	English (US)
Pages (from-to)	1437-1446
Number of pages	10
Journal	Ultramicroscopy
Volume	111
Issue number	8
DOIs	https://doi.org/10.1016/j.ultramic.2011.05.011
State	Published - Jul 2011

Keywords

Coherence
HRTEM
STEM
Source size

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Instrumentation

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10.1016/j.ultramic.2011.05.011

Cite this

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title = "Practical methods for the measurement of spatial coherence-A comparative study",

abstract = "Two new methods for the measurement of transverse spatial coherence in a transmission electron microscope (TEM) are developed and applied to measure the spatial coherence in a field emission gun TEM. Measurements are made under different illumination and operating conditions, illustrating the effect of these conditions on the spatial coherence. The relative merits and limitations of these methods are discussed and compared, together with the previously described {"}Ronchigram{"} method.",

keywords = "Coherence, HRTEM, STEM, Source size",

author = "C. Maunders and C. Dwyer and Tiemeijer, {P. C.} and J. Etheridge",

note = "Funding Information: The authors would like to acknowledge Dr. Philip Martineau and The Diamond Trading Company for supplying the diamond TEM specimens used in this work, Dr. Philip Nakashima for measurement of the PSF of the CCD cameras, Dr. Matthew Weyland for assistance with some of the experiments, and Dr. Christopher Rossouw for supplying the Bloch wave computer code and assistance with the Bloch wave calculations. C.D. and J.E. gratefully acknowledge financial support from FEI Company , nanoTechnology Systems , and the Australian Research Council (ARC Linkage Project LP0990059 ). ",

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doi = "10.1016/j.ultramic.2011.05.011",

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AU - Dwyer, C.

AU - Tiemeijer, P. C.

AU - Etheridge, J.

N1 - Funding Information: The authors would like to acknowledge Dr. Philip Martineau and The Diamond Trading Company for supplying the diamond TEM specimens used in this work, Dr. Philip Nakashima for measurement of the PSF of the CCD cameras, Dr. Matthew Weyland for assistance with some of the experiments, and Dr. Christopher Rossouw for supplying the Bloch wave computer code and assistance with the Bloch wave calculations. C.D. and J.E. gratefully acknowledge financial support from FEI Company , nanoTechnology Systems , and the Australian Research Council (ARC Linkage Project LP0990059 ).

PY - 2011/7

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N2 - Two new methods for the measurement of transverse spatial coherence in a transmission electron microscope (TEM) are developed and applied to measure the spatial coherence in a field emission gun TEM. Measurements are made under different illumination and operating conditions, illustrating the effect of these conditions on the spatial coherence. The relative merits and limitations of these methods are discussed and compared, together with the previously described "Ronchigram" method.

AB - Two new methods for the measurement of transverse spatial coherence in a transmission electron microscope (TEM) are developed and applied to measure the spatial coherence in a field emission gun TEM. Measurements are made under different illumination and operating conditions, illustrating the effect of these conditions on the spatial coherence. The relative merits and limitations of these methods are discussed and compared, together with the previously described "Ronchigram" method.

KW - Coherence

KW - HRTEM

KW - STEM

KW - Source size

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Practical methods for the measurement of spatial coherence-A comparative study

Abstract

Keywords

ASJC Scopus subject areas

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