In order to make course scans at higher distances possible, a high bias voltage is needed. Based on the data available in this article: https://web.archive.org/web/20030508182417/http://www.nanoworld.org/museum/young2.pdf 200 volts should allow field emission scanning in a vacuum. I plan to operate in atmosphere, or possibly in mineral oil as described here: https://www.sciencedirect.com/science/article/abs/pii/092442479087067S Spice shows the high voltage…
The goal of the XYZ stage is to be able to position the STM tip quickly and to enable relatively course scans of the surface topography (for example to choose an area to gather atomic resolution data interactively). As I turned the stage micrometers I noticed that there was a small amount of static friction…
These are the key components to combine for course positioning and scanning. The math says that I should be able to step in increments of 122.6nm! One of the challenges with mounting steppers to micrometers is that the motor has to move along with the micrometer handle, or the shaft coupling needs to allow a…
