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Ab Initio Intermolecular Potential Energy Surfaces and Cross Second Virial Coefficients for the Dimer N2-NO.


ABSTRACT: Ab initio intermolecular potential energy surfaces (PES) of N2-NO have been constructed at the level of theory CCSD(T) with the augmented correlation-consistent basis sets aug-cc-pVmZ (with m = 2, 3, 4). The nitrogen in the closed-shell electronic configuration X1?+ and nitric oxide in the open-shell electronic configuration A2?+ were employed to calculate ab initio intermolecular interaction energies. The two new ab initio 5-site intermolecular pair potentials at the theoretical level CCSD(T)/aug-cc-pVmZ (with m = 4, 24) were developed appropriately and are suitable for N2-NO dimer by using the nonlinear least-squares fitting method combining MIO and Levenberg-Marquardt algorithms. The correlation quality of these two potentials was found to be very good with R 2 values in the range of 0.98372 to 0.99775. The cross second virial coefficients B 12(T) of the N2-NO dimer were calculated in the temperature range of 100 to 470 K using the two ab initio 5-site potentials. The discrepancies between the calculated results and the experimental data can be acceptable.

SUBMITTER: Van Tat P 

PROVIDER: S-EPMC7271377 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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Ab Initio Intermolecular Potential Energy Surfaces and Cross Second Virial Coefficients for the Dimer N<sub>2</sub>-NO.

Van Tat Pham P   Thai Hoa Tran T  

ACS omega 20200519 21


Ab initio intermolecular potential energy surfaces (PES) of N<sub>2</sub>-NO have been constructed at the level of theory CCSD(T) with the augmented correlation-consistent basis sets aug-cc-pV<i>m</i>Z (with <i>m</i> = 2, 3, 4). The nitrogen in the closed-shell electronic configuration X<sup>1</sup>Σ<sup>+</sup> and nitric oxide in the open-shell electronic configuration A<sup>2</sup>Σ<sup>+</sup> were employed to calculate ab initio intermolecular interaction energies. The two new ab initio 5-s  ...[more]

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