Münster 1999 – wissenschaftliches Programm

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VA: Vakuumphysik und Vakuumtechnik

VA 6: Ausgasung und Oberflächen

VA 6.3: Vortrag

Dienstag, 23. März 1999, 16:30–16:50, ZH

Molecular Desorption Induced by Photons on NEG St 707 at Room Temperature — •frederic Le Pimpec — Geneva Schweiz

A photodesorption study was made of a NEG St 707 (SAES Getters TM) at room temperature after conditioning and saturation by CO on a dedicated beamline on the EPA ring at CERN. Measurements were performed using a synchrotron radiation spectrum of 45.3 eV critical energy, with an average photon intensity of 3.7 1016 photons.s-1. The radiation was impinging the NEG surface at normal incidence. The comparison of the desorption yield η (molecules/photon) of an activated NEG and a fully CO saturated NEG is lower than that of 300 C baked stainless steel.