Ptychography

For the experiment, record the global meta data:

• Acceleration voltage (kV; e.g. 300 kV)
• convergence angle
• spot size
• scan rotation

For region of interest, record the following:

• Defocus (nm; under or overfocus?)
• Magnification (Mx) (to determine scan steps)
• Camera length
• dwell time (μs)
• Scan size (pixels; e.g. 512x512)
• Screen current from flucam (pA; e.g. 100 pA; you can change the mono to adjust the probe current, but you will have to fine tune the alignment each time you do. you can take notes on mono but it’s optional)
• Note (interesting shape? zone axis?)

Random notes:

• Why is it hard to find zone axis in nanoparticles? Small particles (1 - 10 nm). Tedious to tilt while constantly moving stage to bring ROI back.