Courses

 

Transmission electron microscopy, "Praktikum Moderne Methoden der Physikalischen Chemie (M.Sc.)

TEM course

In this course you will study different materials with a transmission electron microscope (TEM) equipped with a LaB6 crystal as a cathode. The acceleration voltage is 120 keV corresponding to a wavelength of 0.035 Å. The TEM is equipped with a 2kx2k CCD camera. The examination of the samples involves the performance and analysis of imaging and diffraction studies.

 

Experimental tasks:
  1. Acquire a series of TEM images of gold particles, determine the aspect ratio. Acquire Debye-Scherrer diffraction images and use them to calibrate the diffraction data collected in task 3 and 4. (Au, space group Fm-3m, (111) 2.35 Å, (200) 2.04 Å, (220) 1.44 Å, (311) 1.23 Å, (222) 1.18 Å, (400) 1.02 Å). Why do we use a cubic material for calibration?
  2. Acquire a series of TEM images of CdSe semiconductor nanoparticles and determine size and size distribution.
  3. A TEM grid loaded with an inorganic compound will be provided. Take at least three different single-crystal diffraction patterns (zones), which need to be oriented delivering a diffraction pattern with inversion symmetry. Use the result from task 1 to calibrate the pattern and calculate the d-values. Find the correct compound from a list of compounds available in the script. Discuss the symmetry of the diffraction pattern and extinctions visible in the diffraction pattern according to the space group of the determined material.
  4. Three oriented diffraction patterns are provided for an unknown organic compound. Calibrate the diffraction pattern and calculate the d-values. Find the correct compound from the list of compounds available in the script. Discuss the symmetry of the diffraction pattern and extinctions visible in the diffraction pattern according to the space group of the determined material.
  5. Use the provided in-zone diffration patterns of thee non-linear optical active compound DMACB to determine cell parameters and space group by setting up Vainsthein-plots.
2003-2005 Physical Chemistry experiments: Partial molar volume: the volume contraction is investigated by adding NaOH in water; Spectral analysis: the wavelengths of spectral lines of different elements are analyzed with the aid of a prism spectrometer and the Rydberg constant is determined.

1995-2002 Course (3 weeks) on "structure determination " as add on to advanced course on physical chemistry or as stand-alone course. Conception of talks and Experiments
Course structure determination

1989-1994 Presentation of experiments in the Lectures for Inorganic Chemistry

1988-1989 Training course for Physical Chemistry including thermodynamics PCIII/IV-Vorlesung

2014 Course (2 weeks) on "electron crystallography" Conception of talks and experiments

1989-1994 JGU Presentation of experiments in the Lectures for Inorganic Chemistry

1988-1989 JGU Training course for Physical Chemistry including thermodynamics PCIII/IV-Vorlesung

Course (6 weeks) on "structure determination with electrons"

Wave-particle dualism: A six hours course including 3h theory and 3h hands-on teaching for pupils at high school level. The course provides insight into the applications of an transmission electron microscope (TEM) for materials science using both wave and particle character of an electron for imaging, diffraction and elemental analysis. Preliminary light diffraction experiments prepare for a better understanding of the TEM.