The JT-STM marks SPECS' latest significant achievement in UHV scanning probe microscopy - simple handling, unprecedented stability, and an extremely long operating time without interruption.
Product DescriptionFollowing the design of Prof. Wulf Wulfhekel, the cryostat concept is based on a Joule-Thomson stage below a LHe bath cryostat with vapor-cooled shields and a surrounding LN2 vessel, all in a UHV environment. The consumption of LHe and LN2 in the entire cryostat is extremely low. This reduces cost and vibration and allows automated experiments to be run over very long time periods. The hold time for liquid helium is more than 4 days.
The Joule-Thomson stage below the LHe bath cools the STM down to approximately 1 K using 4He. The handling of the gas flow through the Joule-Thomson stage is very simple. Helium gas from a cylinder is pre-cooled to 4 K and expanded in a long capillary to a pressure of a few millibars. Liquefied helium is collected in the Joule-Thomson vessel. Microscope temperatures below 1.1 K have been achieved.
The STM is extremely stable mechanically at all temperatures and allows positioning of the tip above an atom for extended periods. The thermal broadening of the Fermi edge is reduced significantly compared with what is typically observed at 4 K.
The JT-STM in conjunction with the Nanonis control system exploits both of these advantages to the fullest, and is therefore especially suited to all kinds of tunneling spectroscopy experiments.
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