Hello fellow listmembers,

I indeed agree with Wolfram on this:

"Another word of caution, do not rely on the state of vacuum in any
of these tubes. If you need to use reliably (and reproducably)
evacuated sample / sampling tubes, do it yourself."

Perhaps I can tell how we flush and evacuate our vials:
We have made a construction (a long copper tube) with 40 needles attached to
it(with a valve between every needle and the tube). This tube is connected a
He-supply (ultra pure)on one end and a Turbo pump on the other end. Each of
these are attached to the tube via a valve.

This way it is very easy to evacuate, flush with He and re-evacuate our
vials in no time (40 at a time takes approximately 5 minutes). I might add
that this is easy to make and the cost is minimal (if you have a spare turbo
pump).

Hope this helps,

Peter.

________________________________________

Peter Vervloedt
Laboratory of Applied Physical Chemistry
Ghent University
Coupure, 653
9000 Gent
Belgium

tel.: +32 (0)9 264 6048
fax.: +32 (0)9 264 6230
e-mail: [log in to unmask]
________________________________________
________________________________________

Peter Vervloedt
Laboratory of Applied Physical Chemistry
Ghent University
Coupure, 653
9000 Gent
Belgium

tel.: +32 (0)9 264 6048
fax.: +32 (0)9 264 6230
e-mail: [log in to unmask]
________________________________________