Hi Tom,
We’ve been working on reducing the boron background in a variety of
probes, and settled on the ‘zgbs’ sequence from the standard
Bruker library - it’s an implementation of DEPTH pulses, which I
imagine will work for any probe background.
Best,
Walt
-------------------------------
Walter Massefski, Ph.D.
Director
Department of Chemistry Instrumentation Facility
Massachusetts Institute of Technology
77 Mass. Ave. Rm: 18-0090
Cambridge, MA 02139
T: (617) 253-2016
wwm_at_mit.edu<mailto:wwm_at_mit.edu>
On Jan 10, 2024, at 6:24 PM, Tom Pratum via groups.io wrote:
Hello All-
We have a fairly new 400 MHz NEO Nano instrument with a broadband iProbe. One
user is very interested in 27Al, and I note that in this probe there is a
relatively significant 27Al background signal - I have seen 27Al background
signals in pretty much every probe I have ever looked at. I have attached
a plot of the signal (tuned empty probe) as acquired with a 2 usec pulse
(around a 30 degree pulse at this power level), with the sw maxed out at 1.875 MHz,
and 8 scans. The central component is around 11 kHz wide.
I find the background signal relatively surprising due to the large number
of components, and I am thinking the appearance could possible be due to one
or more spin 5/2 powder patterns in which only the narrowest components appear
due to how the spectrum was acquired, but really don’t know if that
is the case. These components are not artifacts as they do move with the field.
The user has some pretty broad signals they are interested in quantitating,
and it would be good to remove the central component of this background signal
if possible. I can think of a number of characteristics - such as T2 and rf
inhomogeneity - that could be used to remove the signal, but they would also
likely affect the quantitation to some degree,
Does anyone have any experience in removing this background signal they can
suggest?
Thanks in advance.
Tom Pratum,
Southern Oregon University
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Received on Wed Jan 10 2024 - 16:02:46 MST