The application of numerical inversion of the laplace transform to calculate the density of molecular states
- Autores: Adamson S.O.1, Kharlampidi D.D.2,3, Golubkov G.V.1,4, Dyakov Y.A.1, Morozov I.I.1, Olkhov O.A.1, Rodionov I.D.1, Rodionova I.P.1, Stepanov I.G.1, Shestakov D.V.1, Golubkov M.G.1
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Afiliações:
- Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
- Moscow State Pedagogical University
- RUDN University
- National Research Center “Kurchatov Institute”
- Edição: Volume 44, Nº 5 (2025)
- Páginas: 3-14
- Seção: Элементарные физико-химические процессы
- URL: https://journal-vniispk.ru/0207-401X/article/view/295093
- DOI: https://doi.org/10.31857/S0207401X25050014
- ID: 295093
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Resumo
To estimate the rate constants of monomolecular reactions using quasi-equilibrium statistical theory, information on the density of discrete states of molecules is required. In the present work, a new approach to calculating the density of discrete states of stable molecules and transition complexes is proposed, which is based on the numerical inversion of the Laplace transform. To test the method, the calculations of model systems including H₂O, NH₃, CD4 and с-C₃H₆ molecules were carried out. It is shown that at energies less than 200 kcal/mol, the relative error in calculating the density of discrete states does not exceed 0.5%. The results obtained by this method can be used, for instance, to estimate the rate constants of reactions involving organic radicals formed in the troposphere and tropopause.
Texto integral

Sobre autores
S. Adamson
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Autor responsável pela correspondência
Email: sergey.o.adamson@gmail.com
Rússia, Moscow
D. Kharlampidi
Moscow State Pedagogical University; RUDN University
Email: sergey.o.adamson@gmail.com
Rússia, Moscow; Moscow
G. Golubkov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences; National Research Center “Kurchatov Institute”
Email: sergey.o.adamson@gmail.com
Rússia, Moscow; Moscow
Y. Dyakov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: sergey.o.adamson@gmail.com
Rússia, Moscow
I. Morozov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: sergey.o.adamson@gmail.com
Rússia, Moscow
O. Olkhov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: sergey.o.adamson@gmail.com
Rússia, Moscow
I. Rodionov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: sergey.o.adamson@gmail.com
Rússia, Moscow
I. Rodionova
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: sergey.o.adamson@gmail.com
Rússia, Moscow
I. Stepanov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: sergey.o.adamson@gmail.com
Rússia, Moscow
D. Shestakov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: sergey.o.adamson@gmail.com
Rússia, Moscow
M. Golubkov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: sergey.o.adamson@gmail.com
Rússia, Moscow
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