Outgassing of CCD components in the vacuum

Components with strong outgassing

Vacuum connector

The vacuum connector is an electrical plug under vacuum conditions. We found a substantial outgassing for it at the following atomic masses:

Line [amu]	Fragment ions
50	CF₂⁺
65	(not identifiable)
69	CF₃⁺
76	C₆H₄⁺ ?
77	(Phenyl)
149	(Phthalic ester = a softening agent)
157	(Line disappeared later)

At the outer side of the connector the wires are buried into a synthetic material of blue color, while at the inner side another colorless synthetic is used. It could not be determined which side was responsible for the outgassing. In the case of the outer side, the vacuum connector would not be a critical component for CCD-contamination.

Spectrum of the vacuum connector for 95° C. The line at 157 amu has disappeared in the meantime. As this component was analyzed at the beginning of our test series, the background differs in some degree from the spectra which show the most recent background data.

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Last update: Mar 15, 2004
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