Question from NMRWiki Q&A forum Chemical shift evolution compensation for delays flanked by hard or soft pulses

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[Question from NMRWiki Q&A forum] Chemical shift evolution compensation for delays flanked by hard or soft pulses

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NMR processing:

MDD

NMR assignment:

Backbone:

Side-chains:

NOEs:

Structure from NMR restraints:

Ab initio:

Fragment-based:

Rosetta-NMR (Robetta)

Template-based:

GeNMR

I-TASSER

Refinement:

Amber

Structure from chemical shifts:

Fragment-based:

Homology-based:

Torsion angles from chemical shifts:

Preditor

TALOS

Promega- Proline

Secondary structure from chemical shifts:

CSI (via RCI server)

TALOS

MICS caps, β-turns

d2D

PECAN

Flexibility from chemical shifts:

RCI

Interactions from chemical shifts:

HADDOCK

Chemical shifts re-referencing:

NMR model quality:

NOEs, other restraints:

Chemical shifts:

RDCs:

Pseudocontact shifts:

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SAVES2 or SAVES4

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MestReS

V-NMR

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Backbone S2

Methyl S2

B-factor

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Gromacs

Amber

Antechamber

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From structure:

Shiftx2

Sparta+

Camshift

CH3shift- Methyl

ArShift- Aromatic

ShiftS

Proshift

PPM

CheShift-2- Cα

From sequence:

Shifty

Camcoil

Poulsen_rc_CS

Disordered proteins:

MAXOCC

Format conversion & validation:

CCPN

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NMR sample preparation:

Protein disorder:

DisMeta

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Isotope labeling:

Solid-state NMR:

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08-02-2012, 10:48 PM

nmrlearner

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Chemical shift evolution compensation for delays flanked by hard or soft pulses

Chemical shift evolution compensation for delays flanked by hard or soft pulses

Hello all,In a typical 2D experiment, the delay "d0" (t1 increment delay in Bruker) is compensated for the chemical shift evolution that would happen during the rf pulse (hard/soft) that are applied flanking (before and after) the "d0" delay.

I could also find similar such compensations for shaped pulses before a delay in the pulse programs. These compensation factors varies for different types of pulses, e.g. 2/pi for 90 hard pulse , 0.52 for pc490120. Can someone guide me how these compensation factors are calculated for hard as well as shaped pulses? Thanks!

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