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FEM microscopes, X-ray microscopes, Electron microscopes

SPECS Scientific Instruments

  • Scanning tunneling microscope / laboratory / automated

JT-STM

Article: 00049078

Scanning tunneling microscope / laboratory / automated

Joule-Thomson Scanning Tunneling Microscope

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.

Features

Base temperature: Approximately 1 K (optional: 650 mK)
LHe hold time: >100 hours
LN2 time: >80 hours
Extreme stability and resolution
Nanonis control system

Product Description
Following 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.

Specifications

  • Type: scanning tunneling
  • Technical applications: laboratory
  • Other characteristics: automated

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