Incoherent imaging using dynamically scattered coherent electrons
We use a Bloch wave approach to show that, even for coherent dynamical scattering from a stationary lattice with no absorption, annular dark-field imaging in a scanning transmission electron microscope gives a direct incoherent structure image of the atomic-column positions of a zone-axis-aligned cr...
| Үндсэн зохиолчид: | , |
|---|---|
| Формат: | Conference item |
| Хэвлэсэн: |
1999
|
| _version_ | 1826303811688333312 |
|---|---|
| author | Nellist, P Pennycook, S |
| author_facet | Nellist, P Pennycook, S |
| author_sort | Nellist, P |
| collection | OXFORD |
| description | We use a Bloch wave approach to show that, even for coherent dynamical scattering from a stationary lattice with no absorption, annular dark-field imaging in a scanning transmission electron microscope gives a direct incoherent structure image of the atomic-column positions of a zone-axis-aligned crystal. Although many Bloch waves may be excited by the probe, the detector provides a filtering effect so that the 1s-type bound states are found to dominate the image contrast for typical experimental conditions. We also find that the column intensity is related to the transverse kinetic energy of the 1s states, which gives atomic number, Z, contrast, The additional effects of phonon scattering are discussed, in particular the reasons why phonon scattering is not a prerequisite for transverse incoherence. (C) 1999 Elsevier Science B.V. All rights reserved. |
| first_indexed | 2024-03-07T06:08:22Z |
| format | Conference item |
| id | oxford-uuid:ee9e062c-b9f7-455d-9b6f-89a1e9a20532 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:08:22Z |
| publishDate | 1999 |
| record_format | dspace |
| spelling | oxford-uuid:ee9e062c-b9f7-455d-9b6f-89a1e9a205322022-03-27T11:34:06ZIncoherent imaging using dynamically scattered coherent electronsConference itemhttp://purl.org/coar/resource_type/c_5794uuid:ee9e062c-b9f7-455d-9b6f-89a1e9a20532Symplectic Elements at Oxford1999Nellist, PPennycook, SWe use a Bloch wave approach to show that, even for coherent dynamical scattering from a stationary lattice with no absorption, annular dark-field imaging in a scanning transmission electron microscope gives a direct incoherent structure image of the atomic-column positions of a zone-axis-aligned crystal. Although many Bloch waves may be excited by the probe, the detector provides a filtering effect so that the 1s-type bound states are found to dominate the image contrast for typical experimental conditions. We also find that the column intensity is related to the transverse kinetic energy of the 1s states, which gives atomic number, Z, contrast, The additional effects of phonon scattering are discussed, in particular the reasons why phonon scattering is not a prerequisite for transverse incoherence. (C) 1999 Elsevier Science B.V. All rights reserved. |
| spellingShingle | Nellist, P Pennycook, S Incoherent imaging using dynamically scattered coherent electrons |
| title | Incoherent imaging using dynamically scattered coherent electrons |
| title_full | Incoherent imaging using dynamically scattered coherent electrons |
| title_fullStr | Incoherent imaging using dynamically scattered coherent electrons |
| title_full_unstemmed | Incoherent imaging using dynamically scattered coherent electrons |
| title_short | Incoherent imaging using dynamically scattered coherent electrons |
| title_sort | incoherent imaging using dynamically scattered coherent electrons |
| work_keys_str_mv | AT nellistp incoherentimagingusingdynamicallyscatteredcoherentelectrons AT pennycooks incoherentimagingusingdynamicallyscatteredcoherentelectrons |