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…

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