Ultrahigh vacuum facility with the helium cryocondensation pump

Construction of ultrahigh vacuum equipment with a helium cryocondensation pump, designed for making ultrahigh-vacuum studies of films of various materials sprayed in this equipment, is described. The equipment consists of a serially connected, and constantly functioning in an operating regime, ultrahigh vacuum oil-vapor diffusion pump which gives a limiting vacuum of 10-9 to 10-10 mm Hg, at the outlet of which a vacuum of 10-5 to 10-6 mm Hg is maintained, and a helium cryocondensation pump with traps cooled with liquid helium and surrounded below with and above with nitrogen traps and followed by a chamber and chamber cryostat with sample holder. The limiting vacuum, reached in the receiver equipment, is better than 10-14 mm Hg. The body of all ultrahigh vacuum units may be heated to 5000C and cooled to 77 K. The equipment satisfies the requirements for ultrahigh vacuum cryogenic equipment with long continuous evacuation capability