[RASMB] Oil where it shouldn't be

[Holger Strauss]

Hello everybody,

there is the well-known problem of diffusion pump oil condensing on the
lens of the interference optics at low run temperatures. I would like to
hear what others have done about it - I

- have greased the thread of the filter which sits on top of the lens with
vacuum grease; some improvement, but not really (sometimes, the oil
condensed on top of the filter).
- have applied some diffusion pump oil to the lens, but it's too
viscous, so it crept just to the point where the filter is closest to the
lens, fringe pattern looking, ahm, psychedelic at points. Which made me
think, that maybe by applying more and forming a continuous layer of oil,
the problem could be solved?

Finally, has anyone tried to run a turbomolecular pump with the
centrifuge? 

Cheers, Holger

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Holger Strauss 

Forschungsinstitut fuer Molekulare Pharmakologie (FMP)
Robert-Roessle Strasse 10

13125 Berlin/Germany

Tel: +49 (0)30 94793 - 223 (office)
                     - 316 (lab)

Fax: +49 (0)30 94793 - 169 


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Science is spectrum analysis; art is photosynthesis.

                                                    Karl Kraus