Skip to end of metadata
Go to start of metadata

You are viewing an old version of this page. View the current version.

Compare with Current View Page History

Version 1 Next »

The following are the general steps in setting up small convergence angle pencil beam on G-ARM 300F (E02):

  1. Load the standard gold cross-grating sample.

  2. Align the microscope in TEM mode, running the corrector software (COSMO) making sure that coma is corrected to around 80 nm.

  3. In TEM mode, after establishing parallel beam [e.g. by wobbling OL and changing beam spread (CL3) until beam shape is fixed], switch to diffraction and check roundness. Try correcting by adjusting OLS deflectors. Note down the values you reached.

  4. Switch to STEM mode, and press NBD Scan button on the Maintenance panel. By doing so COMO loads the correct files. At this point have the viewing screen in the lowered position and OneView retracted.

  5. Open the Free Lens Control (FLC) panel and insert hex values for the pre-sample lenses. The screenshot here shows the vakues for 300 kV alignment.

  • No labels