Charged particle source
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United States of America Patent
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Aug 27, 2013
Grant Date -
Apr 11, 2013
app pub date -
Oct 5, 2012
filing date -
Oct 7, 2011
priority date (Note) -
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Abstract
A charged particle source comprises at least one gas inlet configured to supply gas particles, at least one tip having a tip apex being biased to provide an electrical field for generating charged particles, and at least one ionization area to which gas particles are supplied. The gas particles are ionized in the ionization area due to the electrical field. Additionally, the charged particle source comprises at least one first electrode configured to accelerate charged particles and at least one light emitting device providing a light beam. The light beam is focused to a focus point in the ionization area, specifically, to a focus volume such that the ionization area is at least partly positioned in the focus volume. The ionization area is arranged between the tip apex and the first electrode. The distance between the ionization area and the tip apex may be from 0.1 nm to 1 nm.
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