How to make S/TEM zone axis tilt maps (1K subscribers special!)
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- Опубликовано: 12 сен 2024
- Getting good zone axis alignment is critical for getting the best high-resolution images whether in conventional or scanning mode. You must use the diffraction pattern to achieve zone axis alignment, but how exactly should you tilt the stage based of the appearance of the pattern to get aligned with the zone axis?
To do this, you need to make what I've termed a "tilt map" or "tilt cheat sheet". If you're lucky, the person who manages your instrument has graciously made one of these for you, but if not, these are not terribly difficult to make on your own. Stay tuned to find out how it's done and what important things you need to consider when making your map(s).
Finally, thank you so much for 1K subscribers!
Thanks for watching! Please like, subscribe, and share and let me know if you have any questions or comments. Video topic requests are always welcome and appreciated; I enjoy making these videos and wish I could make them more frequently, but the demands of my job make it tough to do so; I’m in charge of 3 S/TEMs, 2 dual beam FIB/SEM systems, and 1 SEM and this keeps me very busy!
Connect with me on LinkedIn:
/ nicholas-rudawski-3041...
E-mail me directly:
ngr@ufl.edu
Thanks a lot, sir, for all your videos on TEM. As a new user, it helped me a lot to learn TEM operations and understand the basic concepts in a better way. Please keep doing this great work.
You're very welcome; it's always great to hear that my videos are helping people get better at electron microscopy!
Hi Nicholas, great work. Can you make a video on performing 4D STEM with emphasis on convergence angle for type of data required (separate spot vs diffraction pattern) ? Touching a bit on analysis of data will be bonus.
know a bit from textbook and s/tem practice. now I get the While story here. brilliant work and of great help to tem users! thanks a lot. cheers!
typos......whole story ,,,
Such a perfect video! It helps me a lot and you must have invested enormous efforts in making this vedio! And could you make a vedio about EELS in the further?
If you could do one specifically doing WBDF, that would be fantastic. No one here knows how to do it. Thank you for all your great videos!
Hi Bram: thanks, please see here regarding WBDF:
ruclips.net/video/uTA-OWV2Shc/видео.html
This was done entirely on a cell phone and on an older Tecnai, but the process will be very similar to what is done on a Talos; eventually, I hope to make an updated one on the Talos using better production values!
All your videos are fantastic. Will you cover EELs in the future?
Thanks; will indeed eventually cover EELS on our new Themis Z system (our Talos unfortunately does not have EELS).
hey Nicholas, thanks for the tilt map for new TEM users like me. I wonder that is the tilt map universe for FEI G2 F30? Or I need to try the unique tilt map for my TEM?
Nice. Thank you.
You're welcome.
Dear Nicholas, All your videos are fantastic. Please could you a tutor about how to measure the sample thickness. Thank you very much
Hi Nabil: thank you, I'm glad to hear you like my videos. Measuring TEM sample thickness would be a great video topic, thanks for the suggestion!
Hello Nicholas. I was doing some polymer samples, couple of days ago. They were tough to do, simply because they were getting damaged. So, I had to use the smallest C2 aperture and spread the beam as much as possible. Not sure if I was doing correctly. Is this a reasonable way to do?
Hi Rahul; TEM of polymers is always tricky because of the beam damage issue, but reducing the beam current will help (which is what you did when you reduced the C2 aperture size); the other thing you can do is use a higher numerical value of spot size, which will also decrease beam current; the trade off of course will be reduced signal in your image, but sometimes a damage-free image with poor signal is all you can manage; there are some really nice digital cameras that do low dose imaging like this really well, if you can afford one!
Hello Nicholas. It's long time since your last video. My question is regarding capturing Kikuchi Bands while acquiring DP. Is it possible to capture Kikuchi Band along with DP? I am able to see them on fluorescent screen but unable to capture then using CETA camera.
Hi Rahul: yes, I really need to make another video, sorry I've been slacking off on this! The phosphor screen has a much better dynamic range compared to the Ceta camera. The key to capturing the Kikuchi lines in the Ceta camera is to make sure your area is on the thicker side and to block out the direct beam. You can also do some additional digital processing to make the lines more prominent.
@@NicholasRudawski thank you very much. Talking to you is always helpful. As far as taking Kikuchi Bands is concerned, I cannot go to thick region as my RoI will move out. May be a CMOS camera will be useful.
Could you please make a video about low dose STEM? iDPC-STEM
Hi Cailing: I'm just starting to get some exposure to DPC-STEM, but I don't think I'm comfortable to the point of doing a video right now but definitely a good suggestion for a future topic, thanks!
Can you please make a video on low dose operation on Tecnai ?