Direct diabatization based on nonadiabatic couplings: the N/D method

2018 ◽  
Vol 20 (41) ◽  
pp. 26643-26659 ◽  
Author(s):  
Zoltan Varga ◽  
Kelsey A. Parker ◽  
Donald G. Truhlar
Keyword(s):  
Orbital Free ◽  
Adiabatic Energy

We propose a new diabatization method that is direct, orbital-free, and adiabatic-equivalent based on directly calculated nonadiabatic couplings of states and the adiabatic energy gradients.

scholarly journals ATLAS: A real-space finite-difference implementation of orbital-free density functional theory

2016 ◽  
Vol 200 ◽  
pp. 87-95 ◽  
Author(s):  
Wenhui Mi ◽  
Xuecheng Shao ◽  
Chuanxun Su ◽  
Yuanyuan Zhou ◽  
Shoutao Zhang ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Finite Difference ◽  
Density Functional ◽  
Real Space ◽  
Functional Theory ◽  
Orbital Free

Developing orbital-free quantum crystallography: the local potentials and associated partial charge densities

2021 ◽  
Vol 77 (4) ◽  
Author(s):  
Vladimir Tsirelson ◽  
Adam Stash
Keyword(s):  
Density Functional Theory ◽  
Electron Density ◽  
Density Functional ◽  
Electronic Energy ◽  
Physical Content ◽  
Functional Theory ◽  
Orbital Free ◽  
The One ◽  
Physical And Chemical ◽  
Quantum Crystallography

This work extends the orbital-free density functional theory to the field of quantum crystallography. The total electronic energy is decomposed into electrostatic, exchange, Weizsacker and Pauli components on the basis of physically grounded arguments. Then, the one-electron Euler equation is re-written through corresponding potentials, which have clear physical and chemical meaning. Partial electron densities related with these potentials by the Poisson equation are also defined. All these functions were analyzed from viewpoint of their physical content and limits of applicability. Then, they were expressed in terms of experimental electron density and its derivatives using the orbital-free density functional theory approximations, and applied to the study of chemical bonding in a heteromolecular crystal of ammonium hydrooxalate oxalic acid dihydrate. It is demonstrated that this approach allows the electron density to be decomposed into physically meaningful components associated with electrostatics, exchange, and spin-independent wave properties of electrons or with their combinations in a crystal. Therefore, the bonding information about a crystal that was previously unavailable for X-ray diffraction analysis can be now obtained.

Static and dynamic properties of liquid Zn, Cd and Hg divalent metals: An orbital free ab initio molecular dynamics study

2014 ◽  
Vol 406 ◽  
pp. 45-53 ◽  
Author(s):  
Mohammad Riazuddin Molla ◽  
A.Z. Ziauddin Ahmed ◽  
Horipada Sarker ◽  
G.M. Bhuiyan ◽  
M.R. Amin ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Ab Initio ◽  
Dynamic Properties ◽  
Ab Initio Molecular Dynamics ◽  
Divalent Metals ◽  
Orbital Free

scholarly journals Orbital free entropy, revisited

2014 ◽  
Vol 63 (2) ◽  
pp. 551-577 ◽  
Author(s):  
Yoshimichi Ueda
Keyword(s):  
Free Entropy ◽  
Orbital Free

Orbital-free kinetic-energy density functionals with a density-dependent kernel

1999 ◽  
Vol 60 (24) ◽  
pp. 16350-16358 ◽  
Author(s):  
Yan Alexander Wang ◽  
Niranjan Govind ◽  
Emily A. Carter
Keyword(s):  
Energy Density ◽  
Kinetic Energy ◽  
Kinetic Energy Density ◽  
Density Functionals ◽  
Density Dependent ◽  
Orbital Free
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