It's not a very sensitive nucleus to begin with, and in combination with the
exceptionally long T1 (at least 10 min if not more - I've struggled to me
asure this properly) and a potentially mis-calibrated 90, it'd be easy to not
see it at all. Make sure your relaxation delay and acquisition times are
long enough.
The 89Y shift of my 2 M Y(NO3)3/D2O sample is 4.5 ppm so I assume your samples
aren't very far away from that.
Thanks
Geoff
________________________________
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of Stephen M Spain <smspain_at_unr.edu>
> Sent: Thursday, August 31, 2023 03:38
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: [External] [AMMRL] Y89 measurement
Hi,
One of the PI's wants
to measure Y89 on our 500 MHz Varian VNMRS spectrometer. I found an ancient
10 mm low frequency probe that can do 15 to 50 MHz in one our cabinets that
I'd never used. I got the probe to tune to the 24 MHz needed for Y89 via mtune
but can't observe anything for either the 200 mM or 1 M yttrium nitrate solutions.
Since I've never done
anything this low of a frequency before is there anything besides the quarter
wavelength cable that needs to be changed or adjusted on a Varian VNMRS? I
saw in the probe manual that a switch needed to be flipped on the pre-amp but
I assume that is for an early 1990's console.
The probe is probably
in need of service since it was here decades before I was, but any suggestions
would be greatly appreciated.
thanks,
Stephen
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Received on Thu Aug 31 2023 - 00:37:07 MST