A desktop supersonic free-jet beam source for a scanning helium microscope (SHeM)
MetadataShow full item record
A simple design for an inexpensive, compact, desktop-sized helium free-jet beam source is described. The apparatus, which is Campargue-like in design and utilizes mostly off-the-shelf parts, is capable of producing a centreline intensity of 1.2 × 10^19 atoms per second per steradian. The beam performance was investigated using a conventional ion gauge and a stagnation detector, with the latter being used to produce beam flux profiles. The profile of the macroskimmed beam has been experimentally demonstrated to be strongly Gaussian.
Showing items related by title, author, creator and subject.
Novel method for state selective determination of electron-impact-excitation cross sections from 0° to 180°Weyland, M.; Ren, X.; Pflüger, T.; Baek, W.; Bartschat, K.; Zatsarinny, O.; Fursa, Dmitry; Bray, Igor; Rabus, H.; Dorn, A. (2014)We use an improved target recoil momentum spectroscopy setup to determine differential cross sections for excited metastable state production in atoms and molecules by electron impact and show its capabilities for an ...
Sunarso, J.; Hashim, S.; Lin, Y.; Liu, Shaomin (2017)Helium demand is expected to double within the next two decades given its essential role as a cryogenic fluid and an inert gas in various technological applications whereas its production capacity only increases by 3% per ...
Utamuratov, Ravshanbek (2010)This thesis presents the theoretical studies of positron scattering on the helium atom using two-center Convergent Close-Coupling (CCC) theory.The thesis organized in the following way: In the Introduction (Chapter I) the ...