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NetNotes


If the tool is an ohmmeter, then [some of] the conditions are voltage of the ohmmeter, duration of the measurement cycle, air humidity, degree of mechanical disturbance of the component being tested (like moving, vibration). Te intermittent nature of the problem is the direct result of such dependencies. One must make an educated guess and then give it a try. If “educated guesses” consistently miss the root cause then it becomes an endless affair with an erroneous verdict in the end: “instrument is worn-out and needs to be replaced” or “spare components no longer available” or similar. Usually not true. Old instruments can be maintained reliably and indefinitely. Besides, the CM12 is fairly modern. Modern design, modern composition, modern component base. Components can be easily substituted or repaired/fabricated, with very few exceptions if any.Vitaly Feingold vitaly@sia-cam.com


Update on our scope. Our technician replaced the Wehnelt insert


cap and HT cable, the beam is not pulsing anymore. I was working with the scope all day and everything was fine. I will keep you posted if the issue comes back again. I would like to thank you all for taking the time to share your valuable knowledge and experience with me. I appreciate your help so much. Best wishes, Sara Rizzo sararizzo125@gmail.com


Tat is good to hear. Were you using a LaB6 and CeB6 or Tungsten filament?


I used to work for a company that designed, developed, and built cathodes and electron gun modules for thermionic sources; mainly LaB6


. When the cathode reached the end of life the customer


would send their gun assembly back and we would do a failure analysis report before we replaced the cathode and refurbished the Wehnelt. I always observed a deposited film that had a composition of LaB1


-


xOx. Eventually the film would begin to delaminate, and smaller flakes would curl up towards the cathode. At the time we hypothesized that there was charging and dis-charging of these flakes during operation. Essentially, the film/flakes were acting as a dielectric layer and aſter the charge reached a certain threshold the film would discharge, and the cycle would repeat. Tis changes the electric field lines near the entrance of the Wehnelt, which modulate the beam current (image intensity). Andrew Tron athron@ucdavis.edu


Horizontal Lines Occur During Image Capture Microscopy Listserver I have a Hitachi SU1510 and have been experiencing image


degradation on slow scan or capture, usually exemplified as horizontal lines during the scan. I have replaced the filament and completed an aperture alignment as required but the problem remains. Any ideas? Harry Murray harry.murray@dfo-mpo.gc


Usually this type of artifact is in the detector, not the beam itself.


From my experience it’s more common in SSD-type detectors, but I’ve seen it with end-of-life ETD or ICE-type detectors as well. Do you have the same artifact in multiple SE detectors? At least in FEI tools, the artifact can also be caused by a bad preamp. Kajir Mellor kajirmellor@gmail.com


picture. My first thought might be charging in the sample, but detector electronics are certainly another likely candidate.


Something similar happened to me on our Scios Dual Beam FIB.


Our trinity detectors - a set of below-the-lens, in-lens, and above- the-lens detectors - started showing lines in the images that did not match the contrast of the overall image. Te images were also noisier than usual. Te issue ended up being a pre-amplifier. Andrew Tron athron@ucdavis.edu


74


Tis is one of those times it would be nice to post a link to a It is also good


to check the other detectors, for example, BSE versus SE or ETD at different collection voltages. Warren Straszheim wesaia@iastate.edu


STEM Settings Microscopy Listserver As my TEM is down, I have been working on alternative


instruments. I have a ZEISS NVision 40 with a STEM option but no instructions. I can insert the detector and align the specimens, but that is as far as it goes. Does anyone have suggestions for the correct settings for: 1) operating voltage? 2) Which aperture? 3) What settings for the three “quadrants” of the detector. Any information would be much appreciated. I can get an image but it’s not that great as I’m guessing at the above settings. Thanks in advance. Emma S. Perry emma.perry@maine.edu


Since you have an image, I’m assuming the sample is thin


enough for transmission and you have the sample mounted in the appropriate STEM carrier. You may need to adjust the sample-to- detector distance by moving the stage up or down, but do this care- fully. Generally, higher accelerating voltages will give you a smaller probe and thus higher spatial resolution. You should also work at the maximum voltage to ensure maximum sample transmission, unless your sample is very thin. I would start with a large probe and aperture to make sure you can find the sample and optimize the image, then you can move to smaller spots to increase the spa- tial resolution if needed. I’m not familiar with ZEISS STEM detec- tors, but you should enable all the (HA)ADF and/or BF diodes to maximize the signal collected. Keep in mind the sample-to-detector distance will determine where the signal is landing on the detec- tor. If you still can’t get anything reasonable, be sure to inspect the STEM detector carefully. In a shared-user facility, STEM detectors occasionally get crashed into stages or scratched/broken from un- safe insertions. Check the diodes carefully to make sure they aren’t scratched or broken and check the wiring harness to make sure it’s intact. Since you have something of an image, hopefully all is okay with the detector. Chris Winkler crwinkler@ncsu.edu


Crossword Puzzle Answers See puzzle on page 66.


12 3 12 16


PH O S P H O R C O NV E X HO O K E


4 5 6 13 7


AT M O S P H E 19


22 23


SP A EP H L


30 38 41 T


WO R K I N G D I S T A N C E AT E


HU S 31


26 27 45


V O LTAG E S P I E Z OS EN R T FO P


42 44 46 47 48 55 56 59 62 66 T 49 I 63 C 60 50


RA D I A N L I G A T U RE OB S E R V E D A R T V NB


57 58 61 TE M P O R


A T O M I C I C E 67


64 65 A L N E S T O R www.microscopy-today.com • 2021 September A L


A S G 51


F O C A 52 53 54 L 32 33 39 A S 34 35


T I R T O P 43


40 36 37 20 24 E E


T H I RD L R 17 18


14 15


R E P L E 21


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R D L A 28


25 29 I D E


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