Slowpass.m - Revision history

Kuprov: Update function See also links and function index membership

2026-06-06T18:41:35Z

Update function See also links and function index membership

Kuprov: Rename Arguments section heading to Parameters

2026-06-05T17:52:23Z

Rename Arguments section heading to Parameters

Kuprov: Normalise sequential blank lines

2026-04-25T11:30:09Z

Normalise sequential blank lines

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Kuprov: Sync syntax/arguments/outputs with current Spinach source

2026-04-05T14:06:37Z

Sync syntax/arguments/outputs with current Spinach source

Admin: /* See also */

2018-12-30T14:01:26Z

‎See also

Admin at 14:01, 30 December 2018

2018-12-30T14:01:09Z

Admin: Created page with "Slow passage detection - calculates spectrum values at the user- specified frequency positions using the Fourier transform of the Liouville - von Neumann equation. The biggest..."

2015-12-11T10:04:54Z

Created page with "Slow passage detection - calculates spectrum values at the user- specified frequency positions using the Fourier transform of the Liouville - von Neumann equation. The biggest..."

New page

Slow passage detection - calculates spectrum values at the user-
specified frequency positions using the Fourier transform of the
Liouville - von Neumann equation. The biggest advantage over the
fid+fft style detection is easy parallelization and the possibi-
lity of getting spectrum values at specific frequencies without
recalculating the entire free induction decay. Syntax:

spectrum=slowpass(spin_system,parameters,H,R,K)

where H is the Hamiltonian, R is the relaxation matrix and K is
the chemical kinetics matrix.

The following parameters are required:

parameters.sweep vector with two elements giving
the spectrum frequency extents
in Hz

parameters.npoints number of points in the spectrum

parameters.rho0 initial state

parameters.coil detection state

Relaxation must be present in the system dynamics, or the matrix
inversion operation below would fail to converge. The relaxation
matrix should *not* be thermalized.

@@ Line 39: / Line 39: @@
 ==See also==
-[[acquire.m]], [[fieldscan_enlev.m]], [[fieldscan_magn.m]], [[fieldsweep.m]], [[rapidscan.m]]
+[[acquire.m]], [[fieldscan_enlev.m]], [[fieldscan_magn.m]], [[fieldsweep.m]], [[rapidscan.m]], [[cpmg.m]], [[holeburn.m]], [[hp_acquire.m]], [[impound.m]], [[relaxan.m]], [[sp_acquire.m]], [[traject.m]], [[Built-in_experiments]]
 ''Version 2.3, authors: [[Ilya Kuprov]]''

@@ Line 6: / Line 6: @@
       spectrum=slowpass(spin_system,parameters,H,R,K)
-==Arguments==
+==Parameters==
       parameters.sweep         vector with two elements giving

@@ Line 40: / Line 40: @@
 ==See also==
 [[acquire.m]], [[fieldscan_enlev.m]], [[fieldscan_magn.m]], [[fieldsweep.m]], [[rapidscan.m]]
 ''Version 2.3, authors: [[Ilya Kuprov]]''

@@ Line 1: / Line 1: @@
 {{DISPLAYTITLE:slowpass.m}} __NOTOC__
 Slow passage detection - calculates spectrum values at the user specified frequency positions using the Fourier transform of the Liouville - von Neumann equation. The biggest advantage over the fid+fft style detection is easy parallelization and the possibility of getting spectrum values at specific frequencies without recalculating the entire free induction decay.
 ==Syntax==
-spectrum=slowpass(spin_system,parameters,H,R,K)
+     spectrum=slowpass(spin_system,parameters,H,R,K)
 ==Arguments==
-parameters.sweep         vector with two elements giving
+     parameters.sweep         vector with two elements giving
                               the spectrum frequency extents
                               in Hz
@@ Line 27: / Line 26: @@
 ==Outputs==
-spectrum  - the spectrum of the system with the specified
+     spectrum  - the spectrum of the system with the specified
-                starting state detected on the specified coil
+                 starting state detected on the specified coil
-                state within the frequency interval requested
+                 state within the frequency interval requested
 ==Examples==
 The 14N overtone MAS spectrum of glycine recorded using this method (examples/nmr_overtone/mas_glycine_1.m) appears below. FID+FFT simulation in this system is much slower.
@@ Line 44: / Line 36: @@
 ==Notes==
 Relaxation must be present in the system dynamics, or the matrix inversion operation would fail to converge. The relaxation matrix R should *not* be thermalized.
 ==See also==
 [[acquire.m]], [[fieldscan_enlev.m]], [[fieldscan_magn.m]], [[fieldsweep.m]], [[rapidscan.m]]
 ''Version 2.3, authors: [[Ilya Kuprov]]''

@@ Line 1: / Line 1: @@
 {{DISPLAYTITLE:slowpass.m}} __NOTOC__
 Slow passage detection - calculates spectrum values at the user specified frequency positions using the Fourier transform of the Liouville - von Neumann equation. The biggest advantage over the fid+fft style detection is easy parallelization and the possibility of getting spectrum values at specific frequencies without recalculating the entire free induction decay.
 ==Syntax==
-     spectrum=slowpass(spin_system,parameters,H,R,K)
+spectrum=slowpass(spin_system,parameters,H,R,K)
 ==Arguments==
-     parameters.sweep         vector with two elements giving
+parameters.sweep         vector with two elements giving
                               the spectrum frequency extents
                               in Hz
@@ Line 26: / Line 27: @@
 ==Outputs==
-     spectrum  - the spectrum of the system with the specified
+spectrum  - the spectrum of the system with the specified
-                 starting state detected on the specified coil
+                starting state detected on the specified coil
-                 state within the frequency interval requested
+                state within the frequency interval requested
 ==Examples==
 The 14N overtone MAS spectrum of glycine recorded using this method (examples/nmr_overtone/mas_glycine_1.m) appears below. FID+FFT simulation in this system is much slower.
@@ Line 36: / Line 44: @@
 ==Notes==
 Relaxation must be present in the system dynamics, or the matrix inversion operation would fail to converge. The relaxation matrix R should *not* be thermalized.
 ==See also==
 [[acquire.m]], [[fieldscan_enlev.m]], [[fieldscan_magn.m]], [[fieldsweep.m]], [[rapidscan.m]]
 ''Version 2.3, authors: [[Ilya Kuprov]]''