Fu,
Assuming you're carrying out mostly room temperature experiments:
For your 400 MHz and 500 MHz, instruments, you're not going to notice any
significant difference between using air vs nitrogen.
For your 600 MHz instrument, you may notice it being a bit more difficult to
get a very nice shim, but you should easily be able to meet the specs for your
system.
Just as a comparison, at our old facility, when we got our Cryoprobe, we were
using dry compressed air for the probe gas, and on our unshielded Mark I Oxford
600 MHz magnet, I was always able to shim it to a 5.5 / 11.0, 0.55 Hz lineshape
using air. Specs on that system from Bruker were listed as 7.0 / 14.0, 0.60 Hz.
At our current facility (still using the same Cryoprobe), I can shim our double
shielded Ascend 600 MHz magnet to a 3.0 / 6.0, 0.35 Hz lineshape using nitrogen
generated by a nitrogen separator.
Ronald Shin
University of Alabama at Birmingham
O'Neal Comprehensive Cancer Center
Central Alabama High Field Nuclear Magnetic Resonance Facility
________________________________
> From: main_at_ammrl.groups.io on behalf of Fu Chen via groups.io
> Sent: Thursday, September 25, 2025 5:22 PM
> To: main_at_ammrl.groups.io
> Subject: [AMMRL] compressed N2 gas vs compressed Air
Hello all,
We are considering replacing the compressed air with compressed house N2. Does
anyone have a spec sheet or other documents for comparing using compressed N2
gas vs compressed Air for Bruker NMR instruments?
Thanks,
Fu
Fu Chen, PhD
Director of Analytical NMR Facility
Department of Chemistry and Biochemistry
B0208A Chemistry Building
University of Maryland, College Park, MD 20742
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Received on Fri Sep 26 2025 - 06:30:24 MST