title: Improved charcoal trap for rare gas mass spectrometry.
abstract: A charcoal trap for progressive desorption of rare gases, including helium and neon, is described and performance data given. Cooling is by a commercial helium expansion refrigerator. Temperatures are readily controlled down to about 20 K. No cold, condensed gases are used.
authors.affiliation: Department of Physics, University of California, Berkeley, CA 94720, USA.
authors.forename: J H
authors.initials: JH
authors.lastname: Reynolds
authors.forename: P M
authors.initials: PM
authors.lastname: Jeffery
authors.forename: G A
authors.initials: GA
authors.lastname: McCrory
authors.forename: P M
authors.initials: PM
authors.lastname: Varga
mesh_terms: D000042:Absorption; D002606:Charcoal / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000302:isolation & purification*; D013058:Mass Spectrometry / Q000295:instrumentation* / Q000379:methods; D013048:Specimen Handling / Q000295:instrumentation* / Q000379:methods; D014462:Ultrafiltration / Q000295:instrumentation* / Q000379:methods
chemical_list: D005740:Gases; D002606:Charcoal