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New low background crossed molecular beam apparatus: Low background detection of H2
1998
Review of Scientific Instruments
A low background and almost hydrocarbon free (ϳ1ϫ10 Ϫ14 Torr) molecular beam apparatus with an improved universal detector, based on electron bombardment ionization, has been constructed for crossed molecular beam research. Extremely high vacuum (ϳ1ϫ10 Ϫ12 Torr) for the detector's ionization region is achieved using multiple ultrahigh vacuum pumps. In addition to a home-made liquid nitrogen cryopump and a turbomolecular pump, a two stage cryogenic He cold head ͑ϳ10 K͒ is used to pump the
doi:10.1063/1.1148821
fatcat:xobpkg374vcipanr42w4q5mugi