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we're having a weird phenomenon. We calculate the spring constant of the tip using the thermal fluctuation method. It generally works well but lately we have a strange result. Tips with K > 4 n/m we used before appear to have thermal fluctuation signal which is much reduced. The peak of the FFT signal drops almost an order of magnitude with the
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Currently we're having a very low SUM-signal (0.3V) on our E-scope. Does someone has any experience with this tool? Any suggestions, tricks on how to increase the signal? The same tips we use give a much higher sum signal on our other dimension tools, so it's not a tip problem.
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You may want to check out Bob Wolkow's method for making tips [M. Rezeq, J. Pitters and R.A. Wolkow, J. Chem. Phys. 124 (2006), p. 204716]. He reports the process working with tungsten.
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The two main types of STM tips seem to be W and Pt-Ir. W oxidizes in air, Pt-Ir does not (are you doing STM in air or UHV?). I've seen where people used W tips etched in HF just prior to scanning and they lasted a little while before oxidizing. Usually W tips are electrochemically etched, usually Pt-Ir tips are cut/torn (although they can also be
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How would one get or make STM tips with the following characteristics: -apex has 1 nm radius of curvature (or less) -opening angle (or cone angle) in the 5 nm above the apex is less than 60 degrees (full angle) -tip material is stable in air -can achieve atomic resolution
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We use CO2 snow for cleaning a variety of samples (not usually AFM ones though, those are mostly clean enough after sample prep). It's special gun hooked up to a tank of CO2 - a pretty simple setup. The blast with our gun is quite powerful so holding small samples is a bit of a challenge. The sample should also be heated slightly to stop condensation
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It has recently been discussed with respect to the cleaning of AFM calibration grids. For curiosity reasons, I asked several people, who worked with this technique, about its capabilities. The below is what I found out. Apparently, this method has been used since mid 80's. It works well for removing organics (liquid CO2 is a great organic solvent
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CO2 snow cleaning is an effective surface cleaning process aimed at both particle and hydrocarbon removal. Under good working conditions, particle removal has been measured from visible down to .03 microns (30 nanometers). Hydrocarbon removal is as good as solvents which means it depends on the CO2 or solvent grade. Details on the cleaning mechanisms
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Hi, Does anyone have experience with CO2 snow cleaning? I'd like to know what was your experience in using it? Does it really work to clean everything? And what are the limitations?
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We are seeking highly qualified and motivated applicants with a Ph.D. at the time of employment. The post-doctoral position is funded by the French National Institute for Agricultural Research (INRA) for one year, possibly for two years if renewal is allowed, and is available immediately. Please if you are interested in this position reply to Cedric