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Volumn 89, Issue 15, 2002, Pages 155502/1-155502/4

Atomic resolution three-dimensional electron diffraction microscopy

Author keywords

[No Author keywords available]

Indexed keywords

ABERRATIONS; ALGORITHMS; APPROXIMATION THEORY; COMPUTER SIMULATION; CRYSTAL STRUCTURE; ELECTRON BEAMS; ELECTRON DIFFRACTION; ELECTRON GUNS; ELECTRON SCATTERING; FOURIER TRANSFORMS; NANOSTRUCTURED MATERIALS; THREE DIMENSIONAL;

EID: 0037037902     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.89.155502     Document Type: Article
Times cited : (54)

References (23)
  • 8
    • 84988748273 scopus 로고    scopus 로고
    • note
    • While using a "thin sample" approximation in the Letter, we anticipate that a variety of nanomaterials can be studied by this form of microscopy. For light element, heavily faulted, and amorphous materials, sample thickness can range from a few tens of nanometer or thicker, depending on the energy of the electron beam. For perfect crystals of heavy elements, either thinner samples are desirable or the data collection slight tilts (several millirad) away from zone axes is necessary to dramatically lower the degree of multiple scattering.
  • 19
    • 84988783993 scopus 로고    scopus 로고
    • note
    • We believe that the tilt increments required by this form of microscopy are related to the complexity of the sample structure and the desired resolution. In simulations, we have observed that the quality of the reconstructed structures gradually deteriorated as the rotation increments increased. These effects will be explored further in future studies.
  • 20
    • 84988783994 scopus 로고    scopus 로고
    • note
    • The imaging mechanism of 3D electron diffraction microscopy is somewhat different from that of transmission electron microscopy. The former reconstructs small phase shifts inside each resolution volume of the sample (a resolution volume is a sphere with the diameter corresponding to the resolution length), while the latter images the exit waves from the sample. Due to the small size of each resolution volume, a phase object for 3D electron diffraction microscopy is usually a weak phase object, which is not necessarily the case for transmission electron microscopy. In the computer simulation, we assumed that the absorption by the sample is negligible, which makes the small phase shifts inside each resolution volume not only linear proportional to the Coulomb potential but also real and positive. However, the over-sampling phasing method works for the samples with complex Coulomb potential as well (see Ref. [10] for the computer simulation of the succes reconstruction of complex density distribution in x-ray diffraction using the oversampling phasing method).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.