Re: [AMMRL] Advice on X-nucleus decoupling during 1-D 1H acquisition?

From: Spin-Doc <bert.heise_at_spin-doc.net>
Date: Sat, 14 Feb 2026 22:15:52 +0100
Hi,

A typical rule of thumb for long decoupling times in liquids probes has been to not
exceed around 0.5 W. To decouple a single resonance with WALTZ (just like 1H, needs calibrated 180 pulses). 
Cryoprobes have their own „max decoupling measurement“ in form
of the counter-heating of the cryocooler which reduces with increased decoupling
power which heats the RF coil: A few percent/Watt are always required to keep the temperature constant.

Cheers
Bert

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Am 14.02.2026 um 19:58 schrieb Craig Grimmer via groups.io <craig.grimmer=gmail.com_at_groups.io>:


Good afternoon All

Does anyone have any advice on how to choose an appropriate probe-safe heteronuclear (X) decoupling power level and decoupling scheme for use during 1-D proton experiments?

I don't mean X-decoupling during the short-duration AQ time in an n-D experiment; I'm looking at multi-second X-decoupling during 1-D proton experiments, where X is a low-band/low-gamma nucleus (e.g. 195Pt, 14N, 103Rh).  Most of these X-nuclei have a single resonance so excitation bandwidth is limited.  I'm concerned about potentially excessive decoupling power that may lead to sample heating and probe damage.  The normal spectrometer documentation doesn't seem to address this.

Thank-you,
Craig.

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Received on Sat Feb 14 2026 - 15:29:21 MST

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