Electronic Structure Lab

General interests of the group are understanding the electronic structure of materials using density functional theory. The group works on software development, theory, and applications. Current interests include charge transfer excitations in donor acceptor complexes (organic photovolatics), linear and non linear polarizabilities of molecules.
JPCA Supplementary Cover: Study of Self-Interaction Errors in Density Functional Calculations of Magnetic Exchange Coupling Constants
General interests of the group are understanding the electronic structure of materials using density functional theory. The group works on software development, theory, and applications. Current interests include charge transfer excitations in donor acceptor complexes (organic photovolatics), linear and non linear polarizabilities of molecules.
Study of water polarizability (article published on J. Chem. Phys.)
General interests of the group are understanding the electronic structure of materials using density functional theory. The group works on software development, theory, and applications. Current interests include charge transfer excitations in donor acceptor complexes (organic photovolatics), linear and non linear polarizabilities of molecules.
Our LSIC project is on the US Dept. of Energy science highlights
General interests of the group are understanding the electronic structure of materials using density functional theory. The group works on software development, theory, and applications. Current interests include charge transfer excitations in donor acceptor complexes (organic photovolatics), linear and non linear polarizabilities of molecules.
Electronic structure research group team
General interests of the group are understanding the electronic structure of materials using density functional theory. The group works on software development, theory, and applications. Current interests include charge transfer excitations in donor acceptor complexes (organic photovolatics), linear and non linear polarizabilities of molecules.
Electronic structure research team (2020)
General interests of the group are understanding the electronic structure of materials using density functional theory. The group works on software development, theory, and applications. Current interests include charge transfer excitations in donor acceptor complexes (organic photovolatics), linear and non linear polarizabilities of molecules.
Water cluster anions: assessing the effect of self-interaction errors in negatively charged water molecules. Journal cover.
General interests of the group are understanding the electronic structure of materials using density functional theory. The group works on software development, theory, and applications. Current interests include charge transfer excitations in donor acceptor complexes (organic photovolatics), linear and non linear polarizabilities of molecules.
Multi-chromophoric organic heptad antenna
General interests of the group are understanding the electronic structure of materials using density functional theory. The group works on software development, theory, and applications. Current interests include charge transfer excitations in donor acceptor complexes (organic photovolatics), linear and non linear polarizabilities of molecules.
Fermi-Löwdin orbital self-interaction correction (FLOSIC) center. One of several Computational Chemical Sciences Centers funded by the US Department of Energy.
General interests of the group are understanding the electronic structure of materials using density functional theory. The group works on software development, theory, and applications. Current interests include charge transfer excitations in donor acceptor complexes (organic photovolatics), linear and non linear polarizabilities of molecules.
Local self-interaction correction: the modification to PZSIC to improve the performance of SIC calculations. JCP Editors’ Choice 2019.

Using the JSmol applet

If you need plotting capabilities but the current computer where you are in does not have Jmol or Molekel installed, you can run JSmol, a javascript version of Jmol from our website. Just go to the Utilities tab in the top menu and select "General Jmol Viewer". It will load a sample molecule by default.

In the graphics area, you can click the right-hand side mouse button and goto File->Load->Open local file to open a file from your computer, it works with the files we usually handle in the lab (.xyz, .cube, .MOLDEN).

Performing vibrational analysis

To perform vibrational analysis, first you must obtain the specsym code from the repository, compile it by typing 'make', then take the following files from the converged ground state calculation (this means CONVEGRE TRUE in the GEOCNVRG file) and put them in a separate directory with the specsym binary:

  • GRPMAT
  • VIBINP
  • ISYMGEN
  • SYMBOL
  • INPUT

once there, run the specsym code, which will produce the following new files:

How to plot the polarizability of the cluster using jmol

To process charge of polarizability; that is, show the color of each atom in the molecule in the structure according to its polararizability .

For this we need:
1.- The adious.out file which contain the polarizability of the molecule which is listed according to the contribution due to each atom.
2.- The gemoetry (.xyz) file
3.- A python script called process_charge.py , it can be downloaded here

Now we can put these three files in a directory then we have to run:

./process_charge.py Sc3NC68_6140.xyz Sc3NC68_6140_adious.out -4 7 out.xyz

Fatemeh dedenfed her MS Thesis

Fatemeh Amerikheirabadi successfully defended her physics MS thesis Aug. 7 at 11:00AM

Her thesis is entitled: "ELECTRONIC STRUCTURE AND CHARGE TRANSFER EXCITED STATES OF ENDOHEDRAL FULLERENES CONTAINING ELECTRON DONOR-ACCEPTOR COMPLEXES UTILIZED IN ORGANIC PHOTOVOLTAICS"

Congratulations Fatemeh!!

Shusil defended his MS thesis

Shusil Bhusal successfully defended his Physics master's thesis Aug. 7 at 2:00PM

His thesis is entitled:"STUDY OF DIELECTRIC PROPERTIES OF ENDOHEDRAL FULLERENES"

Congratulations Shusil!!

Starting calculation from SYMBOL changes

We recently did some changes to the code, if you need to restart your calculation from the SYMBOL file read this.

Visit from Ulises

Our own remote reseach associate professor Dr. Jose Uilses Reveles is currently visiting us from Richmond VA.

In the photo is also included our summer project colaborator, CPS PhD student Henry Moncada.

Pictured from left to right
Henry, Dr. Zope, Shusil, Fatemeh, Dr. Baruah, Luis and Ulises

Sparse representation

We have analyzed three big systems for sparse representation, the biggest one is the triad surrounded by water molecules that Carlos is working on:
It contains 666 atoms, the hamiltonian and overlapr matrices are 7792 X 7792 stored as an array of 30361528 elements. Of these only 800842 are non zero for the hamiltonian matrix and 930451 for the overlap matrix. The condition for sparse representation using the Yale format is satisfied.
The other system is just the triad
Atoms=207
N=6157
N_tot=18957403
HAM
Non Zero=1906717
OVL

We need a script for that

We need to write python or perl script that will generate a CLUSTER file for fragment analysis.

Building on what we already have, we could use the memebership files that we already use for DOS calculations in donor-acceptor systems.

These membership files are tied to the XMOL.DAT file for the complete structure. So, we can use them to create a CLUSTER file that will list the atoms according to the memebership files.

Any volunteers? I will offer you a glass of water if you do it.

visit from Ruben Casillas

L-R Dr. Zope,Ruben and Luis

Our ex lab member, UG Ruben Casillas (Dr. Zope was his advisor) stopped to visit last week.
He graduated from the Chemistry dept. and is now working on his PhD at Friedric-Alexander-Universitat in Germany with Dr. Dirk Guldi.
Good luck Ruben!!

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