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Direct Detection Of Polar Structure Formation In Helium Nanodroplets By Beam Deflection Measurements

Long-range intermolecular forces are able to steer polar molecules submerged in superfluid helium nanodroplets into highly polar metastable configurations. We demonstrate that the presence of such special structures can be identified, in a direct and determinative way, by electrostatic deflection … Continue reading

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Contrast Differences Between Nitrogen and Helium Ion Induced Secondary Electron Images Beyond Instrument Effects

The gas field ion source (GFIS) is able to generate tightly focused ion beams, which can be used to image or modify a specimen. Among the beam species, helium offers extremely high resolution, however, low sputter yield and sub-surface bubble … Continue reading

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Non-equilibrium Thermodynamical Description of Superfluid Transition in Liquid Helium

In previous papers a phase field model for λ–transition in 4He was proposed, which is able to describe the influence of the heat flux on the temperature transition. The model presented here generalizes previous results taking into account of a … Continue reading

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A High Capacity Pump For Liquid Helium

A new reciprocating liquid helium pump used for forced flow of supercritical helium has been developed by KfK. The pump is a single-acting piston pump with the following performance: temperature range 3.5–20 K; pressure range 1–10 bar; maximum pressure difference … Continue reading

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