The York STM has been a stalwart of research within the group for many years. The instrument was one of the first to roll off the Omicron production line and experiments performed using it have formed the basis of several PhD thesis. Although now aged the STM is perfectly servicable and easily capable of atomic resolution imaging. The STM is attached to a UHV sample preparation chamber which has LEED/AES and a variety of deposition sources. The system operates at a base pressure of ~1×10-10 mbar. Samples may be heated and Ar+ bombarded and the facility to introduce a variety of gasses to the chamber is available. To reduce vibrations and other interference the system is mounted on three tyre inner tubes and housed within a purpose built "hut" inside the laboratory. This hut may be closed up to isolate the instrument during operation, all rotary pumps, controls and possible sources of vibration being outside the hut.
