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    • Lowest order perturbative approximation to vibrational coupled cluster method in bosonic representation

      T DINESH SUBRATA BANIK

      Volume 132 Published: January 2020 Article ID 0003

    • Fulltext

       

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      https://www.ias.ac.in/article/fulltext/jcsc/132/0003

    • Keywords

       

      Vibrational coupled cluster method; perturbation theory; effective Hamiltonian

    • Abstract

       

      We propose a perturbative approximation to the vibrational coupled cluster method in bosonic representation to reduce the cost of calculating the cluster matrix elements by considering only the first order of S and r for the construction of the effective Hamiltonian ese-SHeSes. With the systematic analysis of theresults of two molecules, H2O and 1,1-difluoroethylene, we find that the accuracy of the transition energies with such low order approximation is comparable to the fully converged VCCM

    • Author Affiliations

       

      T DINESH SUBRATA BANIK1

      1. School of Chemistry, University of Hyderabad, Hyderabad 500 046, Telangana, India

    • Dates

       
      Published
      January 2020
      Manuscript received
      27 April 2019
      Manuscript revised
      30 July 2019
      Accepted
      6 August 2019

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