AMMRL: 1H signal issue

From: Kenneth Sharp-Knott <kknott_at_vt.edu>
Date: Mon, 14 Nov 2022 13:32:52 -0500

This weekend our Agilent MR4DD2 began to act up. The proton spectra look
pretty terrible.

Here is an example of a 1H spectrum I'm getting right now. This is
Sucrose. Every proton basically looks like this. Carbons look just fine.

[image: image.png]
FID
[image: image.png]

However, decoupling seems to be fine as per this C13 spectra of Surcorse

 13C Decoupled
[image: image.png]
Looks normal
[image: image.png]
13C Uncoupled (for comparison).

I've looked at some of the console outputs from the RefGen, Synth board,
etc. and they all seem normal. I would suspect the 1H amplifier might be
the issue but since decoupling is fine, I suppose that unlikely.

I guess I'm thinking 1H preamp at this point? Any thoughts?

-- 
Ken Sharp-Knott
Manager of Analytical Services and the NMR Facility
Department of Chemistry
Virginia Tech
(540)267-6502 (Cell)
(540)231-0885 (Office)

Received on Sun Nov 13 2022 - 22:33:08 MST