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Attention Score in Context
| Title |
Direct imaging of hydrogen-atom columns in a crystal by annular bright-field electron microscopy
|
|---|---|
| Published in |
Nature Materials, February 2011
|
| DOI | 10.1038/nmat2957 |
| Pubmed ID | |
| Authors |
Ryo Ishikawa, Eiji Okunishi, Hidetaka Sawada, Yukihito Kondo, Fumio Hosokawa, Eiji Abe |
| Abstract |
Enhancing the imaging power of microscopy to identify all chemical types of atom, from low- to high-atomic-number elements,would significantly contribute for a direct determination of material structures. Electron microscopes have successfully provided images of heavy-atom positions, particularly by the annular dark-field method, but detection of light atoms was difficult owing to their weak scattering power. Recent developments of aberration-correction electron optics have significantly advanced the microscope performance, enabling identification of individual light atoms such as oxygen, nitrogen, carbon, boron and lithium. However, the lightest hydrogen atom has not yet been observed directly, except in the specific condition of hydrogen adatoms on a graphene membrane. Here we show the first direct imaging of the hydrogen atom in a crystalline solid YH(2), based on a classic 'hollow-cone' illumination theory combined with state-of-the-art scanning transmission electronmicroscopy. The optimized hollow-cone condition derived from the aberration-corrected microscope parameters confirms that the information transfer can be extended to 22.5 nm(-1), which corresponds to a spatial resolution of about 44.4 pm. These experimental conditions can be readily realized with the annular bright-field imaging in scanning transmission electron microscopy according to reciprocity, revealing successfully the hydrogen-atom columns as dark dots, as anticipated from phase contrast of a weak-phase object. |
Mendeley readers
The data shown below were compiled from readership statistics for 334 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Japan | 7 | 2% |
| United States | 4 | 1% |
| Germany | 3 | <1% |
| India | 2 | <1% |
| Belgium | 2 | <1% |
| Brazil | 1 | <1% |
| United Kingdom | 1 | <1% |
| Norway | 1 | <1% |
| Spain | 1 | <1% |
| Other | 1 | <1% |
| Unknown | 311 | 93% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 95 | 28% |
| Researcher | 72 | 22% |
| Student > Master | 26 | 8% |
| Student > Doctoral Student | 23 | 7% |
| Student > Bachelor | 21 | 6% |
| Other | 60 | 18% |
| Unknown | 37 | 11% |
| Readers by discipline | Count | As % |
|---|---|---|
| Materials Science | 148 | 44% |
| Physics and Astronomy | 66 | 20% |
| Chemistry | 32 | 10% |
| Engineering | 20 | 6% |
| Biochemistry, Genetics and Molecular Biology | 4 | 1% |
| Other | 15 | 4% |
| Unknown | 49 | 15% |
Attention Score in Context
This research output has an Altmetric Attention Score of 3. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 25 February 2011.
All research outputs
#7,454,951
of 22,790,780 outputs
Outputs from Nature Materials
#2,899
of 3,973 outputs
Outputs of similar age
#56,034
of 185,212 outputs
Outputs of similar age from Nature Materials
#18
of 24 outputs
Altmetric has tracked 22,790,780 research outputs across all sources so far. This one is in the 44th percentile – i.e., 44% of other outputs scored the same or lower than it.
So far Altmetric has tracked 3,973 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 32.4. This one is in the 16th percentile – i.e., 16% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 185,212 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 27th percentile – i.e., 27% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 24 others from the same source and published within six weeks on either side of this one. This one is in the 1st percentile – i.e., 1% of its contemporaries scored the same or lower than it.