Tagged questions

MAS spin counting

5 0 603
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Hi, We have a Bruker MAS probe (4mm, late 90s vintage, widebore) that reports a spin speed twice what it is actually doi...
Posted: Kate Nairn 11 / Updated: w101bdk 7 Nov 13 '13 at 10:22

Beginners question: checking probe and multinulear ability in Bruker machines

1 1 2k
answers votes views
Hi All, This may be a daft question, but how do I go about identifying the probe in our NMR machine, and hence whether ...
Updated: blankchem 11 Sep 29 '11 at 10:34

How does removal and re-installation of probe affect shims?

2 0 2k
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If you remove and later (not too much later) reinstall the probe and you are confident that probe position inside the ma...
Posted: Evgeny Fadeev 5471 / Updated: Hamish Grant 21 Aug 24 '10 at 17:56

What is radiation damping?

1 1 8k
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What makes very strong signals broader - just due to the interaction of the sample with the detection coil - what is the...
Posted: Evgeny Fadeev 5471 / Updated: Kirk Marat 672 Feb 08 '10 at 05:47

Please suggest experiments that push the power limits of NMR probes

5 1 3k
answers votes views
I'm trying to come up with reasonable tests of probe performance for all channels by simulating conditions at which arci...
Posted: Evgeny Fadeev 5471 / Updated: SankarampadiAravamudhan 91 Oct 22 '10 at 01:56

Using probe that started losing B1 strength or has longer 90 degree pulse

1 0 1k
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I've found that one of our probes lost ~1.5-2 dB of power on 13C, but nutation curve looks OK. There are no random spike...
Posted: Evgeny Fadeev 5471 / Updated: Joseph DiVerdi 146 Apr 19 '10 at 18:07

How to use network analyzer or oscilloscope to tune and match NMR probe?

1 0 4k
answers votes views
Hello, could someone share directions on how to tune and match NMR probe RF circuit using a network analyzer? We have a ...
Posted: Evgeny Fadeev 5471 / Updated: Kirk Marat 672 Jan 14 '10 at 11:51

What happens if NMR probe is not perfectly tuned/matched?

2 1 2k
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What may happen if probe tuning/matching is not perfect besides loss in the sensitivity, any more subtle details? Whoul...
Posted: Magnethead 42 / Updated: carl carter 21 Feb 22 '10 at 16:10
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