Dear Robert，
It is so great to have the response from you, I have carefully read your series
publications about NMR chemical shift calculations using WIEN2k on Physical
Review B, which are so helpful.
Using the borate mineral of probatite (CaNa[B5O7(OH)4].3H20) as an example, I
am going to investigate the magnetic shielding mechanism at the five B sites in
it by decomposing the chemical shifts into different energy windows. These
energy windows include core states (<-3.6), Na/2s (-3.6, -3.5), Ca/3s (-2.8,
-2.6), Na/2p (-1.5, -1.45), Ca/3p & O/2s (-1.45, -1.1), B/2s (-0.7, -0.45),
B/2p & Na/3s, Ca/43 and O/2p (>-0.45). Of course, I also calculated the
contributions from the energy window gaps between them, which usually are very
close to 0.0000.
At the same time, I also obtained the chemical shifts (":NMRTOTxxx) at each B
sites from the energy window of (-infinity, +infinity) by running "x_nmr_lapw".
I tabulated the data of ":NMRTOTxxx" from the above different energy windows
using "x_nmr_lapw -emin xx -emax yy". However, the ":NMRTOTxxx" from
(-infinity, +infinity) is not equal the summation of ":NMRTOTxxx" from the
above windows such as core states, Na/2p, B/2s, O/2p, B/2p etc. There exists a
systematic differenece around 11 ppm between the summation and that for
(-infinity, +infinity), may I interpret such a difference as the interestial
contributions for the chemical shifts?
On the other hand, the summations of ":NMRTOTxxx" from the above energy windows
also deviate from the corresponding summations of ":NMRSPHxxx" as expected, may
I also explain such deviations as from the interestial contributions?
In one word, I am a begainner for such a NMR study, I am desperate for your
helps, I hope you don't mind giving me further helps when you are available.
Thank you again!
Bing
--------------------------------------------
On Sun, 10/27/13, Robert Laskowski <rol...@ihpc.a-star.edu.sg> wrote:
Subject: Re: [Wien] two questions about NMR calculations
To: "A Mailing list for WIEN2k users" <wien@zeus.theochem.tuwien.ac.at>
Received: Sunday, October 27, 2013, 8:49 PM
Hi,
energy is in Ry. Did you included core contribution to the
total shielding?
It is excluded when emin is specified.
regards
Robert
On 28 October 2013 AM 8:25:37 Bing Zhou wrote:
> Dear all,
>
> I try to decompose the magnetic shielding contributions
into different
> energy windows using DOS, here I have two questions in
running
> "x_nmr_lapw":
>
> Question 1 is about the additivity of the NMR shielding
contributions from
> different energy windows: I assume the summation for
the shielding
> contributions from each energy windows should be equal
to the total
> chemical shielding calculated. However, it seems not
that case, i.e., the
> summation did not add up to the total shielding
calculated, am I right or
> did I miss something?
>
> Questions 2 is simply about the energy unit used for
energy window of DOS:
> there are two energy units (eV and Ry) for DOS map,
however, what is the
> default energy unit in running "x_nmr_lapw -emin xx
-emax yy"? "xx" and
> "yy" are in the unit of Ry?
>
> Thank you in advance!
>
> Bing
>
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Department
Institute of High Performance Computing, A*STAR
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