Single atom spectroscopy with reduced delocalization effect using a 30 kV-STEM

Suenaga, Kazu; Iizumi, Yoko; Okazaki, Toshiya

doi:10.1051/epjap/2011100414

Cited by 38 publications

(26 citation statements)

References 10 publications

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“…"Atomic-resolution imaging was reached with small chromatic aberration and a large uniform phase". This work is a continuation of that of Suenaga et al [177,178].…”

Section: Jeol Crest R005 and CCC (Triple C)supporting

confidence: 58%

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The correction of electron lens aberrations

Hawkes

2015

Ultramicroscopy

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“…"Atomic-resolution imaging was reached with small chromatic aberration and a large uniform phase". This work is a continuation of that of Suenaga et al [177,178].…”

Section: Jeol Crest R005 and CCC (Triple C)supporting

confidence: 58%

“…Correction of the spherical aberration of a 200 kV TEM by means of a hexapole corrector.Optik 99,[167][168][169][170][171][172][173][174][175][176][177][178][179] M Haider, G. Braunshausen and E. Schwan (1995)…”

mentioning

confidence: 99%

The correction of electron lens aberrations

Hawkes

2015

Ultramicroscopy

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“…Energetically, it would also fit to the oxygen K edge. However, this signal is too weak (intensity of signal only 0.1% above background) and therefore it would only correspond to a handful of atoms30. Although the detection of carbon appears to be trivial, because the Au-X cuboid is directly located on top of the multilayer graphene substrate, the exclusion of all other reasonable elements justifies the conclusion that carbon must be the only constituent element in addition to gold.…”

Section: Resultsmentioning

confidence: 99%

Bottom-up formation of robust gold carbide

Westenfelder

Biskupek

Meyer

et al. 2015

Sci Rep

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A new phenomenon of structural reorganization is discovered and characterized for a gold-carbon system by in-situ atomic-resolution imaging at temperatures up to 1300 K. Here, a graphene sheet serves in three ways, as a quasi transparent substrate for aberration-corrected high-resolution transmission electron microscopy, as an in-situ heater, and as carbon supplier. The sheet has been decorated with gold nanoislands beforehand. During electron irradiation at 80 kV and at elevated temperatures, the accumulation of gold atoms has been observed on defective graphene sites or edges as well as at the facets of gold nanocrystals. Both resulted in clustering, forming unusual crystalline structures. Their lattice parameters and surface termination differ significantly from standard gold nanocrystals. The experimental data, supported by electron energy loss spectroscopy and density-functional theory calculations, suggests that isolated gold and carbon atoms form – under conditions of heat and electron irradiation – a novel type of compound crystal, Au-C in zincblende structure. The novel material is metastable, but surprisingly robust, even under annealing condition.

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“…At an e‐beam energy of 200 or 300 keV, commonly utilised in TEM, light and medium atomic weight elements that constitute the vast majority of molecular compounds are highly susceptible to ejection. However, a sharp decrease of σ d for most elements when the energy of the e‐beam is lowered has the consequence that most of the studies on carbon‐based materials in an aberration‐corrected TEM are nowadays performed at voltages of 80 kV or 60 kV and even below …”

Section: Introductionmentioning

confidence: 99%

Isotope Substitution Extends the Lifetime of Organic Molecules in Transmission Electron Microscopy

Chamberlain

Biskupek

Skowron

et al. 2014

Small

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Structural characterisation of individual molecules by high‐resolution transmission electron microscopy (HRTEM) is fundamentally limited by the element and electron energy‐specific interactions of the material with the high energy electron beam. Here, the key mechanisms controlling the interactions between the e‐beam and C–H bonds, present in all organic molecules, are examined, and the low atomic weight of hydrogen—resulting in its facile atomic displacement by the e‐beam—is identified as the principal cause of the instability of individual organic molecules. It is demonstrated theoretically and proven experimentally that exchanging all hydrogen atoms within molecules with the deuterium isotope, and therefore doubling the atomic weight of the lightest atoms in the structure, leads to a more than two‐fold increase in the stability of organic molecules in the e‐beam. Substitution of H for D significantly reduces the amount of kinetic energy transferred from the e‐beam to the atom (main factor contributing to stability) and also increases the barrier for bond dissociation, primarily due to the changes in the zero‐point energy of the C–D vibration (minor factor). The extended lifetime of coronene‐d12, used as a model molecule, enables more precise analysis of the inter‐molecular spacing and more accurate measurement of the molecular orientations.

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Single atom spectroscopy with reduced delocalization effect using a 30 kV-STEM

Cited by 38 publications

References 10 publications

The correction of electron lens aberrations

The correction of electron lens aberrations

Bottom-up formation of robust gold carbide

Isotope Substitution Extends the Lifetime of Organic Molecules in Transmission Electron Microscopy

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