Tagged questions

How to check acquisition status of the NMR instrument remotely?

2 0 1k
answers votes views
Hello, does anyone know whether the instrument is busy or not by logging in remotely? How do you do that on the platfor...
Posted: Evgeny Fadeev 5571 / Updated: renee 56 Dec 16 '10 at 03:13

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

2 0 2k
answers votes views
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 5571 / Updated: Hamish Grant 21 Aug 24 '10 at 17:56

How to remove baseline DC offset in Bruker EMX EPR spectra?

1 0 1k
answers votes views
Hello, I've noticed recently that our EPR spectrometer (Bruker EMX500) has a negative offset on the baseline and it bec...
Posted: Evgeny Fadeev 5571 / Updated: Alex Blumenfeld 11 May 12 '10 at 11:55

How to determine physical orientation of X and Y shims?

2 0 1k
answers votes views
Hello, I need to help solids lab at our UCI site - they have a custom probe and need to orient it properly in order to e...
Posted: Evgeny Fadeev 5571 / Updated: Jerry Hirschinger 189 Sep 13 '10 at 08:46

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 5571 / Updated: SankarampadiAravamudhan 91 Oct 22 '10 at 01:56

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

1 0 2k
answers votes views
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 5571 / Updated: Joseph DiVerdi 146 Apr 19 '10 at 18:07

What may cause lock level depend on pfgon setting in vnmr?

2 1 2k
answers votes views
Hello, I've been working through the probe performance tests and noticed that when I change pfgon='yyy' to pfgon='nyn' l...
Posted: Evgeny Fadeev 5571 / Updated: Jerry Hirschinger 189 Sep 28 '10 at 12:12

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 5571 / Updated: Kirk Marat 656 Jan 14 '10 at 11:51

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

2 1 3k
answers votes views
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

How to set up EPR measurement at elevated temperatures?

0 0 1k
answers votes views
What setup do you use to measure EPR at temperatures above room temperature? We have a Bruker EMX500 instrument and we...
Updated: Evgeny Fadeev 5571 Apr 14 '10 at 16:28
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