Date: Mon, 08 Jun 2026 10:41:27 -0700
Hi all,
We are trying to run 6Li solution NMR on a Bruker 400 MHz system and appear
to be getting, perhaps unsurprisingly, substantial 2H lock-related noise in
our 6Li NMR spectra. The screenshot here shows experiments that are nominally
identical except that the red spectrum was run with lock on, and gave multiple
ADC overflow warnings. Running without 2H lock seems to significantly help
the noise problem (blue spectrum). However, we would like to ultimately run
some 6Li experiments with 2H locking to avoid drift in longer experiments
to improve SNR.
I thought that preamp filtering might help here. I see that there is
a preamp filter that Bruker provides, seen below - does anyone know how to
get a hold of a Bruker 400 MHz 6Li-pass / 2H-stop filter, or who the right
contact would be, assuming these parts are still manufactured? Or any
other advice that might help here? Thanks!
The specific part I found is Z42408, listed in Bruker manual Z31430_09
(https://2210pc.chem.uic.edu/nmr/downloads/bruker/en-US/pdf/z31430_9.pdf )
as Z42408 FILTER 400 6LI-PASS / 2H-STOP
Best,
David
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