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connecting the video output on an external monitor. T is microscope has probably two stages of defl ectors to scan the beam and each of them set with X and Y defl ection coils. T e most common problem is coming from power transistor on horizontal circuit. T is component is more stressed because the scan speed horizontal is faster than the vertical. T is electronic is sensitive to temperature of the room and of the cooling water. T e faster the speed, the more those transistors are working. If you can set your microscope to slow scan mode when you do not use, it is safety for defl ection circuit. High magnifi cation position is also good. Nicolas Stephant nicolas.stephant@univ-nantes.fr Fri Mar 3


EDS:


zinc oxide and iron oxide reference standards One of the users for our EM facility is looking for zinc oxide and iron oxide as standard reference for EDS analysis. If anyone can help. Ravi T akkar ravi.thakkar369@gmail.com Mon Apr 17 We may need more information before we can answer the question well—at least, I would need more. Is this EDS in conjunction with TEM or SEM? T e form of the material would diff erent for the two applications. If TEM, I do not have much to suggest since I do SEM. It seems they would want a thin fi lm or powder. If SEM, they would probably want a homogenous, bulk sample. T ey can get bulk samples of iron oxide. Does it matter if it is Fe 2 O 3 or Fe 3 O 4 ? I am used to zinc oxide being a powder. It might be challenging to fi nd it in bulk form. What do they ultimately want to know? Do they want to know if their material matches? Do they want to quantify the oxide? Do they want to see if they have excess oxygen? I oſt en fi nd users coming in with too narrow a question. When I found out the true issue, there is usually much more freedom in suggesting a solution. Why do they want the oxides? Most EDS systems will have standards built in for


the elements. T ey are oſt en quite good. I would not think that they need the oxides of the metals. What form is their sample in, bulk, powder, fi lm? If it is not fl at, polished, thick material, then accurate quant will be out of the question. I hope that the answer is not simply “Because”. I fi nd it much easier to help someone who is forthcoming with information rather than one who is dead-set on a single course of action. Warren Straszheim wesaia@iastate.edu Tue Apr 18 T ere are some sources for standards mentioned in this thread: http://


probesoſt ware.com/smf/index.php?topic=889.msg5674#msg5674 John J. Donovan donovan@uoregon.edu Tue Apr 18 I am not affi liated with Ted Pella, but they do sell EDS/WDS mineral/oxide standards. http://www.tedpella.com/calibration_html/ UHV-EL_Reference_Standards_for_EDS_WDS.htm Anonymous Tue Apr 18


EDS: convert .spx data to .txt or .csv


I recently used an FEI Tecnai Osiris S/TEM to obtain EDS of my sample. I believe we have a Super-X EDX detection system in conjunction with Bruker Esprit soſt ware. T e data was unfortunately saved as .spx. Is there any way I could convert it into .txt or .csv format? Anuja Bhalkikar anuja.bhalkikar@huskers.unl.edu Wed Apr 19 Please look at the web page of NIST DTSA II soſt ware < http:// www.cstl.nist.gov/div837/837.02/epq/dtsa2/ >. It should be possible to import .spx fi le into this soſt ware and then export the data in .cvs format. Unfortunately I do not have any .spx fi les at hand, but I have tested it on .msa and .spc fi les, and it works well. Oldřich Benada benada@biomed.cas.cz Wed Apr 19


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