Calculations of spherical aberration-corrected imaging behaviour.
Different optimal operating conditions for a C3-corrected transmission electron microscope were compared for both conventional field emission sources and for the next generation of monochromated instruments. In particular, the contrast transfer functions and corresponding wave aberration functions f...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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2003
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| _version_ | 1797085005591085056 |
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| author | Chang, L Chen, F Kirkland, A Kai, J |
| author_facet | Chang, L Chen, F Kirkland, A Kai, J |
| author_sort | Chang, L |
| collection | OXFORD |
| description | Different optimal operating conditions for a C3-corrected transmission electron microscope were compared for both conventional field emission sources and for the next generation of monochromated instruments. In particular, the contrast transfer functions and corresponding wave aberration functions for two previously proposed optimal conditions in which C3 is adjusted to compensate, respectively, C5 or Cc are critically compared. The results indicate that in the presence of a small positive C5 the former provides flat transfer to the information limit whereas the latter shows oscillatory transfer at high spatial frequencies, which is more pronounced for the monochromated instrument. The effects of this behaviour were further investigated through multislice simulations of Si [110] and diamond [110] under the C5-limited condition. These confirm that for the former structure with an interatomic separation of 0.14 nm this aberration has little influence, but that for the latter with a sub-0.1 nm interatomic separation its presence leads to a restricted defocus range over which the structure is faithfully resolved. |
| first_indexed | 2024-03-07T02:03:06Z |
| format | Journal article |
| id | oxford-uuid:9e098d07-ae2e-4a72-b3a5-d2510b2259ab |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:03:06Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | oxford-uuid:9e098d07-ae2e-4a72-b3a5-d2510b2259ab2022-03-27T00:47:18ZCalculations of spherical aberration-corrected imaging behaviour.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9e098d07-ae2e-4a72-b3a5-d2510b2259abEnglishSymplectic Elements at Oxford2003Chang, LChen, FKirkland, AKai, JDifferent optimal operating conditions for a C3-corrected transmission electron microscope were compared for both conventional field emission sources and for the next generation of monochromated instruments. In particular, the contrast transfer functions and corresponding wave aberration functions for two previously proposed optimal conditions in which C3 is adjusted to compensate, respectively, C5 or Cc are critically compared. The results indicate that in the presence of a small positive C5 the former provides flat transfer to the information limit whereas the latter shows oscillatory transfer at high spatial frequencies, which is more pronounced for the monochromated instrument. The effects of this behaviour were further investigated through multislice simulations of Si [110] and diamond [110] under the C5-limited condition. These confirm that for the former structure with an interatomic separation of 0.14 nm this aberration has little influence, but that for the latter with a sub-0.1 nm interatomic separation its presence leads to a restricted defocus range over which the structure is faithfully resolved. |
| spellingShingle | Chang, L Chen, F Kirkland, A Kai, J Calculations of spherical aberration-corrected imaging behaviour. |
| title | Calculations of spherical aberration-corrected imaging behaviour. |
| title_full | Calculations of spherical aberration-corrected imaging behaviour. |
| title_fullStr | Calculations of spherical aberration-corrected imaging behaviour. |
| title_full_unstemmed | Calculations of spherical aberration-corrected imaging behaviour. |
| title_short | Calculations of spherical aberration-corrected imaging behaviour. |
| title_sort | calculations of spherical aberration corrected imaging behaviour |
| work_keys_str_mv | AT changl calculationsofsphericalaberrationcorrectedimagingbehaviour AT chenf calculationsofsphericalaberrationcorrectedimagingbehaviour AT kirklanda calculationsofsphericalaberrationcorrectedimagingbehaviour AT kaij calculationsofsphericalaberrationcorrectedimagingbehaviour |