selective excitation pulse

[Zhengfeng]

Dear Mikhail,
The part of design of a selective excitation pulse in your
spinevolution paper really troubles me. First, how to create
the .fit, .wht
files to set the target excitation profile? Second,I can't get the
correct .pwr file which contains the resulting pulse shape. I used
the
command "spinev selpul -s -pwr" and just got the wrong .pwr file.
Look forward to your reply!

[Mikhail Veshtort]

Hi Zhengfeng,

You can create these files with a text editor, MATLAB, Excel, or even
SPINEVOLUTION itself, and I can't help you with it. This sort of
issues everyone should figure out for themselves.

The -pwr issue you are mentioning is a bug. Thanks for discovering it.
I will correct it.

Mikhail

[Zhengfeng]

Dear Mikhail,
Thank you for your qucik response!
I've modified the cs_iso_1 in the selpul to be /-2:0.02:2/ and
created the corresponding .fit,.wht files, but I failed. I don't know
the relationship between *_re.fit and *_im.fit, *_re.wht and
*_im.wht.

The error message:
Maximum possible Function reduction estimated by NL2SOL is
2.687495e-04
Tolerance values used for the convergence criteria:
AFC_TOL=1.4e-14 RFC_TOL=1.0e-03 XC_TOL=3.5e-04 XF_TOL=1.2e-06

Warning: incorrect or inconsistent fit data sampling point or label at
point 101

Here is part of 201 points in the .fit, .wht files.
# point cs_iso _re.fit _im.fit _re.wht _im.wht
96 -0.1000 0 0 0 0
97 -0.0800 0 0 0 0
98 -0.0600 0 0 0 0
99 -0.0400 1.0000 0 1.0000 1.0000
100 -0.0200 1.0000 0 1.0000 1.0000
101 0 1.0000 0 1.0000 1.0000
102 0.0200 1.0000 0 1.0000 1.0000
103 0.0400 1.0000 0 1.0000 1.0000
104 0.0600 0 0 0 0
105 0.0800 0 0 0 0
106 0.1000 0 0 0 0

My best

Zhengfeng

[Mikhail Veshtort]

Hi Zhengfeng,

"Maximum possible ..." is not an error message. All error messages
start with "Error: ..."
But the warning that you got indicates that there is a discrepancy
between your input file and the one of the fit/wht files or between
the fit/wht files. Please try to find that discrepancy yourself as I
am too busy these days to help people with such trivial matters.

Best,
Mikhail