Unanswered questions

splitting QCPMG echo train

0 0 317
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Hi all, I'm running qcpmg (qcpmgaq), using bruker topspin3. Does anyone have a suggestion how to split the echos train? ...
Posted: shon roni 1 Mar 23 '15 at 04:07

How to calcualte eoors in ppm from Hz of Hsqc data?

1 0 494
answers votes views
Hi all, I want to calculate error in ppm from my Hsqc data. My spectrometer yields X1axis, Y1Axis, DX1, DY1, X1ppm, and ...
Posted: ick lad 1 / Updated: Arkadiusz Leniak 238 Mar 17 '15 at 02:10

Why NMR can deliver angstrom reolution structures.

1 0 479
answers votes views
How can NMR operating at radiofrequency wavelengths deliver angstrom resolution? For example X-ray crystallography opera...
Posted: Anon 1 / Updated: Arkadiusz Leniak 238 Mar 17 '15 at 01:10

Absence of some signals on 1H and 13C spectra of polyaromatic carboximidate

3 0 1k
answers votes views
Hi, I have encountered a strange behaviour of some signals (they are absent) in a series of polycyclic aromatic carboxi...
Posted: Arkadiusz Leniak 238 / Updated: zablociak 21 Mar 23 '15 at 12:11

reading Bruker phase data

1 0 482
answers votes views
Hi all, I'm having trouble reading the 2dseq file for a scan I ran. It should contain 2 slices of 66x50 voxels, repeate...
Updated: Nicholas E 11 Mar 13 '15 at 10:53

Mechanism of chemical exchange between labile protons (OH, NH, SH)

1 0 697
answers votes views
Hello All Does anyone know of any good articles dealing with the mechanisms of labile proton exchange in non-aqueous so...
Posted: Craig 41 / Updated: gravatar 83 Mar 09 '15 at 02:28

Topshim error

2 0 1k
answers votes views
HELLO all nmr wikier,I am facing problem in runing topshim on bruker 500Mhz using topspin 2.1 it finishes with error (fi...
Posted: feroon 21 / Updated: Jim Lin 1 Mar 31 '15 at 06:19

noisy hmqc and hmbc spectra

2 0 826
answers votes views
Hey all! We've got a serious problem because with our new probe (5mm bbo bruker) the t1 noise in the heteronuclear corr...
Posted: apophis 1 / Updated: Pete Gierth 401 Feb 25 '15 at 14:06

log: Failed to find Z0 - low s/n

2 0 604
answers votes views
Hi, everybody! I met a problem on Varian 400 MR: DMSO samples don't lock by "find Z0" button, but I can find lock signal...
Posted: Ilya N 1 / Updated: Ulrich Haunz 185 Mar 09 '15 at 09:18

Coherence transfer pathway for Magic sandwich echo

0 0 808
answers votes views
Hi, I am writing the pulse sequence for magic sandwich echo*, but I am stuck with the phase cycle since I don't have a ...
Updated: Traveller 1 Feb 15 '15 at 15:59
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