Hello Alexej,
We have two Bruker NB magnets with CPMAS capabilities. The 300 MHz system
has been fine for ~12 years. I would suggest at least 100 Watt 1H, 300 Watt
X. The other magnet is a 600 MHz system; it has not worked for more than 1
month over the past 2.5 years. The probe has been in Bruker's hands for
most of this time. (Germany 3 times). The problem is that it does not
handle the power very well. Only can take 125 watts of 1H before it smokes.
Also the sensitivity has not come close to specs. ~ 25:1 after 4 scans on
Glycene is the best they have been able to get (specs are 45:1). I would not
recommend a high field Bruker CPMAS system on a narrow bore magnet. Doty
makes a nice probe that they say will take ~350 watts of 1H???
Give me a call or email if you have any questions.
Cheers
David Kiemle
NMR and MS Specialist
SUNY ESF
Syracuse NY, 13143
315 470-6883
-----Original Message-----
From: alexej@lbl.gov [mailto:alexej@lbl.gov]On Behalf Of Alexej Jerschow
Sent: Monday, December 11, 2000 4:57 PM
To: bruker-users-mail@purcell.cchem.berkeley.edu
Subject: Narrow-bore Solids
Dear Bruker Users,
I would like to inquire about practical details of solid state NMR in
narrow-bore magnets.
As I understand it there are some limitations concerning the probes: two
channel CPMAS only, limitation of sample size. I would especially
appreciate practical advice on issues such as tuning, maintenance, etc.
of probes. Are the narrow-bore probes more fragile?
Any other advice is most welcome.
Thank you very much
Alexej Jerschow
-- Alexej Jerschow Hildebrand D-62 Department of Chemistry University of California Berkeley, CA 94720-1460 Tel: 510-486-7442 or 510-642-2094 Fax: 510-486-5744 AJerschow@lbl.gov
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