Hi all,<br>
Recently I learned methods which are now widely used for analyzing the
chemical bonds (Chem.Rev, 2000, 100, 717). Partitioning schemes based
on the electronic charge distribution include the natural bondorbital
(NBO), thecharge distribution analysis (CDA), the atoms-in-molecules
(AIM) method. There are also methods which define the partitioning of
the energy of a chemical bond in different contributions: the energy
decomposition analysis (EDA), the extended transition state (ETS) and
the constrained space orbital variation (CSOV) method.<br>
<br>
The basic ideas of the EDA, ETS and CSOV methods are the
following. The total bond energy ∆E of a bond A-B is partitioned
into four components which are calculated separately in four
consecutive steps: ∆E=∆Eprep + ∆Eels + ∆EPauli + ∆Eorb. Like the EDA
and ETS methods, the CSOV partitioning scheme uses the frozen orbitals
of the fragments as the starting point for the energy decomposition by<br>
superimposing them fixed at their separated unit character. Starting
from the superposition of the fragments, the wave function of the
complex is optimized in a series of steps. The energy changes which are
associated with changing the size of the variational space indicate the
importance of the different orbital interactions for the bond energy.<br>
<br>
These methods provide insights into the chemical bondings; in contrast,
method like charge density difference is not so effective as these
methods.<br>
Here goes my question: has any of these methods
been implemented in the QE package? How can I carry out CSOV
method in PWscf to study a bonding of an adsobate-substrate
interaction. <br>
<br>
Another question: I noticed that electron localizaiton function
analysis was not implemented in previous versions of QE package. I
don't know whether it is included or not.<br>
<br>-- <br>Yours sincerely,<br><br>Jibiao Li<br><br>State Key Lab of Corrosion and Protection (SKLCP)<br>Institute of Metal Research (IMR)<br>Chinese Academy of Sciences (CAS), China<br>Phone: 024-23904856<br>Email: <a href="mailto:jibiaoli@gmail.com">jibiaoli@gmail.com</a>