cooling air flow rates/ spectrometer instability
T. Pratum (pratum@u.washington.edu)
Tue, 11 Nov 1997 17:44:43 -0800 (PST)
I have been thinking for a couple of days about how to word this question,
and haven't come up with any better way, so here goes:
Does anyone have a "rule of thumb" regarding the highest cooling air flow
rate which is safe without causing sample instability (without spinning)?
We have a group here that is complaining about spectrometer instability at
the cooling air flow rates they are trying to use. I agree with them that
the instability is caused by the cooling air flow rate being too high, but
I think I disagree that they should expect to be able to turn it up that
high (they are turning it up so high in an attempt to get the temperature
lower).
I realize that this would depend on whether the spinner is a bulky Varian
type or the smaller Bruker type, so I should say that this is on a Bruker
DRX console using a 5mm probe.
If I do get any useful responses I will, as usual, summarize them.
Tom Pratum
Dept of Chemistry
Box 351700
Univ of Washington
pratum@u.washington.edu
http://weber.u.washington.edu/~pratum