Procedure and Tasks

    1. Start with a voltage of 10 kV an modest intensity
    2. Focus the electron beam onto an undamaged position of the graphite
    3. Copy the (hexagonal) diffraction dots onto a transparent sheet
    4. Repeat the experiment for the voltages of 6 kV and 8 kV
    5. Verify the DeBroghli relation between l and the voltage V
    6. Draw the reciprocal lattice plane perpendicular to the bean direction
    7. Derive the atomic distance in the hexagonal plane of graphite

 

    1. Perform the experiment for the voltages of 6 kV, 8 kV and 10 kV
    2. Focus the electron beam onto an undamaged position of the Al
    3. Measure the radii of the diffraction rings for each voltage
    4. Verify the DeBroghli relation between l and the voltage V
    5. Which points in the reciprocal lattice contribute to the rings?
    6. Determine the size of the unit cell and the atomic distance.
    7. Comment on the lattice structure.