Electron Crystallography School
July 04 - 08, Changchun 2005

Organised by
Prof. Shilun Qiu    Prof. Jihong Yu
(Jilin University , Changchun, China)

Teachers Sven Hovmöller (SH) Structural Chemistry, Stockholm University, S-106 91 Stockholm, Sweden. E-mail svenh@struc.su.se       Tel +46 8 16 23 80  Fax +46 8 16 31 18. Xiaodong Zou (XDZ) Structural Chemistry, Stockholm University, S-106 91 Stockholm, Sweden. E-mail zou@struc.su.se   Tel +46 8 16 23 80  Fax +46 8 16 31 18. Peter Oleynikov (PO) Structural Chemistry, Stockholm University, S-106 91 Stockholm, Sweden. E-mail oleiniko@struc.su.se    Tel +46 8 16 25 70  Fax +46 8 16 31 18. 　 All from Structure Chemistry, Stockholm University SE-106 91 Stockholm Sweden Textbook: Electron Crystallography. Electron microscopy and electron diffraction Zou & Hovmöller

Applications should be made before June 20, 2005. Please download and fill the registration form.

Lectures

I. Theory

 Microscopy:

• Image Formation and Diffraction

• Kinematical and Dynamical Theory

 Crystallography

• The effects of symmetry in real and reciprocal space

• The phase problem and ways to solve it

II.  Data Collection, Quantification and Processing

Digitisation from film and CCD Camera

• HREM (= High resolution Electron Microscopy)

• SAED  (= Selected Area Electron Diffraction)

• X-ray Powder diffraction

Data Processing

• Images: Fourier processing and extraction of amplitudes and phases

• SAED patterns: Extraction of intensities and Correction for Ewald sphere curvature and     misalignment

III. Determining Symmetry and Finding the Phases

Data analysis

     • Symmetry determination from HREM, SAED (and CBED)

     • 3D data merging

Phasing Methods

     • Experimental phases from HREM images

     • Phase extension

     • Deduced ab initio by probability; direct methods

IV. Constructing and Verifying a Structure Model

3D structure Determination and Evaluation

     • Inverse FT of phased data

     • Interpretation of density maps

Structure Refinement and Verification

     • Fourier refinement

     • Least-squares refinement

V. Applications of Electron Crystallography

     • Inorganic compounds; minerals, modulated structures, quasicrystals...

     • Organic compounds: lipids, liquid crystals, aromatics

     • Proteins; membrane proteins

Lab sessions

I. Image Processing

• Digitising HRTEM images. Fourier processing. Lattice refinement.

• Extracting crystallographic structure factor amplitudes and phases from HRTEM images

• Determining and compensation for the CTF

• Solving an inorganic structure from the processed image

II. Selected Area Electron Diffraction (SAED)

• Indexing an SAED pattern.

• Primitive and centered cells, symmetry determination from SAED

• Extraction of electron diffraction intensities

• Discussion of the value of SAED data; kinematical or dynamical?

• The Precession method for obtaining (near) kinematical electron diffraction data

IV. Direct Methods for Solving a Crystal Structure

• The triple relations

• Origin definition

• Solving an inorganic structure from electron diffraction data

VI. Structure Refinement against Electron and X-ray Diffraction Data

• Refinement of an inorganic crystal structure against SAED data to 0.8 Å resolution, using the standard X-ray crystallographic least-squares refinement program SHELX.

• Rietveld refinement using X-ray powder diffraction data

The Friendship Hall of Jilin University  (In the Friendship Hall, your options include single or double rooms furnished with necessary facilities such as bed, bookshelf, chair, desk, showerhead, satellite-TV, telephone, and the Internet. Each floor in the hall also provides public facilities such as kitchen and washing-machine (insert coins to operate). In some residential areas, there are gym and business center; besides, food and laundry services are provided.

Optional hotel : Tiandu hotel (nearest)  Tel: 86-431-5178621

Other Hotels in Changchun

State Key Laboratory of Inorganic Synthesis & Preparative Chemistry
Jilin University
2699 Qianjin Street
Changchun 130012
P. R. China