Abstract
This paper describes an UHV system for studying condensed films or free metal surfaces at temperature near 14 K. The system consists of a commercial cryopump, and 80 1/s ion pump, a sorption pump and a 30 l chamber having one square meter of internal surface. The standard nonbakeable components in the cryopump have been modified at the factory. The charcoal is now held in contact with 14 K cryopanel by means of small copper rods and a brass screen; all connections are made by Conflat flanges; and the indium gaskets have been replaced by silver ones. With the exception of the charcoal and the electrical feedthroughs, the system is entirely metallic. A base pressure in the 10−11 Torr range can be reached after a 24 h bakeout period at 250°C. During this period, only the ion pump is operative. Between experiments, the cryopump can be periodically turned off and regenerated by pumping the desorbing gases with the ion pump. The base pressure can be restored 4 h after restarting the cryopump.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
