Using a nondirect product discrete variable representation for angular coordinates to compute vibrational levels of polyatomic molecules

2008 ◽  
Vol 128 (19) ◽  
pp. 194109 ◽  
Author(s):  
Xiao-Gang Wang ◽  
Tucker Carrington
Keyword(s):  
Polyatomic Molecules ◽  
Discrete Variable ◽  
Discrete Variable Representation ◽  
Vibrational Levels ◽  
Angular Coordinates ◽  
Variable Representation

A finite basis‐discrete variable representation calculation of vibrational levels of planar acetylene

1992 ◽  
Vol 97 (6) ◽  
pp. 4255-4263 ◽  
Author(s):  
Joseph A. Bentley ◽  
Robert E. Wyatt ◽  
Michel Menou ◽  
Claude Leforestier
Keyword(s):  
Finite Basis ◽  
Discrete Variable ◽  
Discrete Variable Representation ◽  
Vibrational Levels ◽  
Variable Representation

Vibration–rotation calculations for using a Morse-based discrete variable representation

1994 ◽  
Vol 72 (5-6) ◽  
pp. 238-249 ◽  
Author(s):  
James K. G. Watson
Keyword(s):  
Hamiltonian Operator ◽  
Discrete Variable ◽  
Discrete Variable Representation ◽  
Least Squares Fit ◽  
Vibrational Levels ◽  
Internuclear Distances ◽  
Complete Set ◽  
Vibration Rotation ◽  
Set Up ◽  
Variable Representation

The Hamiltonian operator for the X3 symmetric triatomic molecule, using Eckart axes with the three internuclear distances as internal coordinates, is derived and applied to numerical calculations of the vibration–rotation spectrum of [Formula: see text]. A C2ν-symmetrized discrete variable representation based on Morse functions is employed for the J = 0 vibrational problem. The unphysical points with ri < 0 or ri + rj < rk are avoided by giving them a large potential energy (106 cm−1). This procedure is not exact, but is adequate for vibrational levels well below the barrier to linearity. The matrices of the complete Hamiltonian in a D3h-symmetrized basis of products of the lowest 50 vibrational eigenvectors with the complete set of rotational functions for each J are set up and diagonalized, and the eigenvectors are used to calculate line strengths. Initially, the well-known potential surface of Meyer et al. (1986) was employed. Subsequently, 7 of the 30 coefficients in this potential were adjusted to give a least-squares fit to the published observed lines of [Formula: see text].

Erratum: Vibration–rotation calculations for using a Morse-based discrete variable representation

1994 ◽  
Vol 72 (9-10) ◽  
pp. 702-713 ◽  
Author(s):  
James K. G. Watson
Keyword(s):  
Hamiltonian Operator ◽  
Discrete Variable ◽  
Discrete Variable Representation ◽  
Least Squares Fit ◽  
Vibrational Levels ◽  
Internuclear Distances ◽  
Complete Set ◽  
Vibration Rotation ◽  
Set Up ◽  
Variable Representation

The Hamiltonian operator for the X3 symmetric triatomic molecule, using Eckart axes with the three internuclear distances as internal coordinates, is derived and applied to numerical calculations of the vibration–rotation spectrum of [Formula: see text]. A C2v-symmetrized discrete variable representation based on Morse functions is employed for the J = 0 vibrational problem. The unphysical points with ri < 0 or ri + rj < rk are avoided by giving them a large potential energy (106 cm−1). This procedure is not exact, but is adequate for vibrational levels well below the barrier to linearity. The matrices of the complete Hamiltonian in a D3h-symmetrized basis of products of the lowest 50 vibrational eigenvectors with the complete set of rotational functions for each J are set up and diagonalized, and the eigenvectors are used to calculate line strengths. Initially, the well-known potential surface of Meyer et al. (1986) was employed. Subsequently, 7 of the 30 coefficients in this potential were adjusted to give a least-squares fit to the published observed lines of [Formula: see text].

Rovibrational spectroscopic constants of the interaction between ammonia and metallo-phthalocyanines: a theoretical protocol for ammonia sensor design

2017 ◽  
Vol 19 (17) ◽  
pp. 10843-10853 ◽  
Author(s):  
Alan R. Baggio ◽  
Daniel F. S. Machado ◽  
Valter H. Carvalho-Silva ◽  
Leonardo G. Paterno ◽  
Heibbe Cristhian B. de Oliveira
Keyword(s):  
Dft Calculations ◽  
Theoretical Approach ◽  
Schrodinger Equation ◽  
Spectroscopic Constants ◽  
Sensor Design ◽  
Discrete Variable ◽  
Ammonia Sensor ◽  
Discrete Variable Representation ◽  
Representation Method ◽  
Variable Representation

We developed an adapted theoretical approach based on DFT calculations (B3LYP) and the nuclear Schrödinger equation using the Discrete Variable Representation method to model the interaction of ammonia with metallo-phthalocyanines.

Imaginary-Time Time-Dependent Density Functional Calculation of Excited States of Atoms Using CWDVR Approach

2021 ◽  
Vol 323 ◽  
pp. 14-20
Author(s):  
Naranchimeg Dagviikhorol ◽  
Munkhsaikhan Gonchigsuren ◽  
Lochin Khenmedekh ◽  
Namsrai Tsogbadrakh ◽  
Ochir Sukh
Keyword(s):  
Excited States ◽  
Density Functional ◽  
Time Dependent ◽  
Discrete Variable ◽  
Coulomb Wave Function ◽  
Discrete Variable Representation ◽  
Density Functional Calculation ◽  
Imaginary Time ◽  
Sham Equation ◽  
Variable Representation

We have calculated the energies of excited states for the He, Li, and Be atoms by the time dependent self-consistent Kohn Sham equation using the Coulomb Wave Function Discrete Variable Representation CWDVR) approach. The CWDVR approach was used the uniform and optimal spatial grid discretization to the solution of the Kohn-Sham equation for the excited states of atoms. Our results suggest that the CWDVR approach is an efficient and precise solutions of excited-state energies of atoms. We have shown that the calculated electronic energies of excited states for the He, Li, and Be atoms agree with the other researcher values.

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