Difference between revisions of "Relax disp.spin lock offset+field"
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[http://www.nmr-relax.com/manual/Dispersion_model_summary.html Refer to the manual for parameter explanation] | [http://www.nmr-relax.com/manual/Dispersion_model_summary.html Refer to the manual for parameter explanation] | ||
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| + | The relax function relax_disp.spin_lock_offset() requires the values to be provided in ppm. | ||
== Literature comments == | == Literature comments == | ||
See Figure 1 and 10 in the reference. | See Figure 1 and 10 in the reference. | ||
Palmer, A.G. & Massi, F. (2006). Characterization of the dynamics of biomacromolecules using rotating-frame spin relaxation NMR spectroscopy. Chem. Rev. 106, 1700-1719 [http://dx.doi.org/10.1021/cr04042875 DOI] | Palmer, A.G. & Massi, F. (2006). Characterization of the dynamics of biomacromolecules using rotating-frame spin relaxation NMR spectroscopy. Chem. Rev. 106, 1700-1719 [http://dx.doi.org/10.1021/cr04042875 DOI] | ||
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| + | === spin lock field === | ||
The offset is in the literature noted as $\Omega$, where Omega | The offset is in the literature noted as $\Omega$, where Omega | ||
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In the literature, the values are often stated as "offset", "carrier offset", "offset of the spin-lock pulse" with values given in Hz, and have values from 0-500 to 10-20.000 Hz. | In the literature, the values are often stated as "offset", "carrier offset", "offset of the spin-lock pulse" with values given in Hz, and have values from 0-500 to 10-20.000 Hz. | ||
| − | The | + | === spin lock offset === |
| + | |||
| + | == The trouble == | ||
And here comes the trouble. | And here comes the trouble. | ||
Revision as of 00:17, 16 March 2014
Contents
Setting up relax_disp.spin_lock_offset and relax_disp.spin_lock_field
Manual on relax_disp.spin_lock_field
relax_disp.spin_lock_field(spectrum_id=None, field=None)
Manual on relax_disp.spin_lock_offset
relax_disp.spin_lock_offset(spectrum_id=None, offset=None)
Refer to the manual for parameter explanation
The relax function relax_disp.spin_lock_offset() requires the values to be provided in ppm.
Literature comments
See Figure 1 and 10 in the reference.
Palmer, A.G. & Massi, F. (2006). Characterization of the dynamics of biomacromolecules using rotating-frame spin relaxation NMR spectroscopy. Chem. Rev. 106, 1700-1719 DOI
spin lock field
The offset is in the literature noted as $\Omega$, where Omega
In the literature, the values are often stated as "offset", "carrier offset", "offset of the spin-lock pulse" with values given in Hz, and have values from 0-500 to 10-20.000 Hz.
spin lock offset
The trouble
And here comes the trouble.
Does the Hz frequency refers to RF fields applied at the 1H Larmor frequency or 15N frequency?
At page 1708 is states that w_1S = w_1 and w_eS = w_e. And in pulse sequence it states that:
Varian / VnmrJ
In some pulse sequences, the following is seen:
'trim' is a basic timeunit and the total spinlock time is calculated as 2.0*ncyc*trim
b1 = getval("b1"), /* spin-lock field, Hz! */
deltadof2 = getval("deltadof2"), /* offset for N15 spinlock */
