Talk:Ion pump

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Untitled[edit]

There seems to be a misunderstanding of the meaning of "ion pump." This entry, "Ion pump (physics)" was created to refer to a vacuum pumps, as a disambiguation from Ion transporter. A vacuum ion pump ionizes residual gases and accelerates them towards a Ti cathode, causing a sputtering event, a process is is most decidedly -not- reversible -- the article previously stated that the process is reversible. User Mikiemike seems to have misunderstood this meaning and reverted the article, and added a reference regarding pumps which operate by means of action on ions in a fluid. This is an entirely separate topic from the vacuum ion pump and would necessitate a separate article. 24.155.69.144 (talk) 03:57, 16 February 2009 (UTC)[reply]

The sputtering process is not technically reversible but inert gasses that strike a Ti cathode can be ejected as neutrals which are then absorbed when they strike another surface. This is the basis for noble ion pumps, which use a Ta cathode which results in many more neutrals due to it's tight crystal lattice structure. --Rpm5099 (talk) 16:31, 18 November 2009 (UTC)[reply]

Ion pump head jpeg is a NEG cartridge possibly from SAES Getters[edit]

The image titled Ion pump head jpeg is a NEG cartridge possibly from SAES Getters.

It has a different pumping mechanism as it uses Non Evaporable Getter, activated with heat. This type of pump does not pump CH4 or noble gases. It should be on a different page.

I have many diagrams and images of cells and modules relating to ion pumps. I could upload these. — Preceding unsigned comment added by Vacuumguru (talk • contribs) 15:17, 27 September 2011 (UTC)[reply]

External links modified[edit]

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Misleading lede[edit]

The reference used to justify the claim that pressures "as low as" 1E-11 mbar is an Agilent brochure. On page 26 of that pamphlet, a table lists the "Ultimate Pressure" as "below 10E-11" [mbar] of their Vaclon Plus 500 pump. At those ultra-high vacuum conditions, the limiting factor is leakage and out-gassing, so it's misleading to make absolute claims about what is attainable imho. It's also probably worth pointing out that for these low pressures, both cryocooling and ion pumping are often combined.Abitslow (talk) 18:51, 5 June 2016 (UTC)[reply]

Copyright problem removed[edit]

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SI Units please[edit]

Not much to say that's not already covered by the heading. I would rather that pressures are quoted in Torr, because that seems to be in wide use. But the correct SI Unit is Pascals. Either way Millibars is neither in wide usage or the standard unit. Andypreston (talk) 09:57, 22 October 2019 (UTC)[reply]