Difference between revisions of "Zulf abrupt.m"
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| − | {{DISPLAYTITLE:zulf_abrupt.m}} | + | {{DISPLAYTITLE:zulf_abrupt.m}} __NOTOC__ |
| − | Zero-field NMR with an abrupt field drop. | + | Zero-field NMR experiment with an abrupt field drop that propagates the initial condition through an exponential drop in the external magnetic field and then detects at zero field. |
==Syntax== | ==Syntax== | ||
| Line 6: | Line 6: | ||
fid=zulf_abrupt(spin_system,parameters,H,R,K) | fid=zulf_abrupt(spin_system,parameters,H,R,K) | ||
| − | == | + | ==Parameters== |
| − | |||
| − | |||
| − | |||
parameters.drop_field - the magnetic field that the sample should | parameters.drop_field - the magnetic field that the sample should | ||
| Line 18: | Line 15: | ||
parameters.drop_npoints - number of discretisation points in the drop | parameters.drop_npoints - number of discretisation points in the drop | ||
| − | + | ||
parameters.drop_rate - field drop rate, Hz | parameters.drop_rate - field drop rate, Hz | ||
| − | parameters. | + | parameters.sweep - sweep width during acquisition |
| + | |||
| + | parameters.npoints - number of points during acquisition | ||
| − | parameters. | + | parameters.detection - 'uniaxial' to emulate common ZULF |
| + | hardware, 'quadrature' for proper | ||
| + | frequency sign discrimination | ||
| − | parameters. | + | parameters.flip_angle - pulse flip angle in radians for |
| + | protons; for other nuclei, this | ||
| + | will be scaled by the gamma ratio | ||
==Outputs== | ==Outputs== | ||
fid - the free induction decay detected on the | fid - the free induction decay detected on the | ||
| − | + | internally generated gamma-weighted state | |
| + | |||
| + | ==Notes== | ||
| + | This function ignores the offset parameter and makes its own Hamiltonian. | ||
==Examples== | ==Examples== | ||
| Line 36: | Line 42: | ||
==See also== | ==See also== | ||
| − | [[zerofield.m]], [[fieldscan_enlev.m]], [[fieldscan_magn.m]] | + | [[zerofield.m]], [[fieldscan_enlev.m]], [[fieldscan_magn.m]], [[rydmr.m]], [[Built-in_experiments]] |
| − | |||
''Version 2.1, authors: [[Ilya Kuprov]]'' | ''Version 2.1, authors: [[Ilya Kuprov]]'' | ||
Latest revision as of 19:43, 6 June 2026
Zero-field NMR experiment with an abrupt field drop that propagates the initial condition through an exponential drop in the external magnetic field and then detects at zero field.
Syntax
fid=zulf_abrupt(spin_system,parameters,H,R,K)
Parameters
parameters.drop_field - the magnetic field that the sample should
be dropped to, starting from the field spe-
cified in sys.magnet, Tesla
parameters.drop_time - drop time, seconds
parameters.drop_npoints - number of discretisation points in the drop
parameters.drop_rate - field drop rate, Hz
parameters.sweep - sweep width during acquisition
parameters.npoints - number of points during acquisition
parameters.detection - 'uniaxial' to emulate common ZULF
hardware, 'quadrature' for proper
frequency sign discrimination
parameters.flip_angle - pulse flip angle in radians for
protons; for other nuclei, this
will be scaled by the gamma ratio
Outputs
fid - the free induction decay detected on the
internally generated gamma-weighted state
Notes
This function ignores the offset parameter and makes its own Hamiltonian.
Examples
See zero_field_acetonitrile.m file in examples/nmr_zerofield directory.
See also
zerofield.m, fieldscan_enlev.m, fieldscan_magn.m, rydmr.m, Built-in_experiments
Version 2.1, authors: Ilya Kuprov
