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Accurate Potential Energy Surface for Quartet State HN 2 and Interplay of N( 4 S ) + NH( X̃ 3 Σ - ) versus H + N 2 ( A 3 Σ u + ) Reactions
A global potential energy surface for the lowest quartet state of HN is reported for the first time from accurate multireference ab initio calculations extrapolated to the complete basis set limit using the double many-body expansion method. All its stationary points are characterized, with the lowe...
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Published in: | The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2020-02, Vol.124 (5), p.781-789 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | A global potential energy surface for the lowest quartet state of HN
is reported for the first time from accurate multireference ab initio calculations extrapolated to the complete basis set limit using the double many-body expansion method. All its stationary points are characterized, with the lowest quartet of HN
predicted to have a bent global minimum 36 kcal mol
below the N(
) + NH(
Σ
) asymptote, from which it is barrierlessly achievable. The entire set of calculated ab initio points has been fitted for energies up to 1000 kcal mol
above the global minimum with an RMSD of 0.89 kcal mol
, a gap comprising all identified stationary points. Special care is taken in modeling the involved long-range forces and cusps caused by crossing seams. The novel PES prompts for the calculation of rate constants for several unexplored reactions that are relevant for combustion, plasma, and atmospheric chemistry. |
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ISSN: | 1089-5639 1520-5215 |
DOI: | 10.1021/acs.jpca.9b09467 |