Outgassing of CCD components the vacuum

Components with strong outgassing

Finger grease

Finger grease was put onto a small cleaned metal plate by simply touching it several times. Afterwards, this plate was inserted onto the probe holder and heated. To ensure that the finger grease was the only possible source of contamination, the hands were washed some minutes before without soap. This experiment revealed an unexpectedly rich spectrum, especially towards temperatures of 50 - 75° C.

Line [amu]	Fragment ions
13	CH⁺
24	C₂⁺
25	C₂H⁺ ?
31	CF⁺
36	H³⁵Cl⁺
37	³⁷Cl⁺, C₃H⁺
38	H³⁷Cl⁺, C₃H₂⁺
42	C₃H₆⁺
50	CF₂⁺
51	(not identificable)
53	C₄H₅⁺ ?
55	C₄H₇⁺
56	C₄H₈⁺ ?
57	C₄H₉⁺
60	(not identificable)
65	(not identificable)
67	C₅H₇⁺ ?
68	C₅H₈⁺ ?
69	CF₃⁺
73	(not identificable)
77	(Phenyl)
79	(not identificable)
81	(not identificable)
91	C₇H₇⁺ ?
95	(not identificable)

The rich spectrum of finger grease at 75° C.

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