Dear Steve,
See the paper by Halas and Durakiewicz, Improved adsorbant trap for
gases, Chem. Geol. 122 (1995) 271. It is important to adsorb and
desorb gases with 100% yield to avoid fractionation. The finger
described in this paper allows one to do it in a reasonably short
time.
Regards,
Tomasz
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Dr. Tomasz Durakiewicz
Mass Spectrometry Laboratory
Institute of Physics
Maria Curie Sklodowska Univ.
20-031 Lublin, Poland
tel.: (48 81) 537 62 75
fax: (48 81) 533 36 69