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Exhaustive State-to-State Cross Sections and Rate Coefficients for Inelastic N 2 -N 2 Collisions using QCT Combined with Neural Network Models.
- Source :
-
The journal of physical chemistry. A [J Phys Chem A] 2024 Jul 18; Vol. 128 (28), pp. 5435-5444. Date of Electronic Publication: 2024 Jul 02. - Publication Year :
- 2024
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Abstract
- Using the quasi-classical trajectory method, we systematically studied the state-to-state vibrational relaxation process of N <subscript>2</subscript> ( v <subscript>1</subscript> ) + N <subscript>2</subscript> ( v <subscript>2</subscript> ) collisions over a wide temperature range (5000-30,000 K). Different temperature dependencies of the single- and multiquantum VV and VT events in various ( v <subscript>1</subscript> , v <subscript>2</subscript> ) collisions are captured, with the dominant channel being related to the initial vibrational energy levels ( v <subscript>max</subscript> = 50). At a specified relative translational energy, there is a monotonic relationship of the VT cross sections with the vibrational energy level, particularly in high-energy collisions. Additionally, we constructed well-trained neural network models ( R -values reaching 0.99) using limited quasi-classical trajectory (QCT) data sets, which can be used to predict the state-to-state cross sections and rate coefficients of the VV processes N <subscript>2</subscript> ( v <subscript>1</subscript> ) + N <subscript>2</subscript> ( v <subscript>2</subscript> ) → N <subscript>2</subscript> ( v <subscript>1</subscript> - Δ v ) + N <subscript>2</subscript> ( v <subscript>2</subscript> + Δ v ) and VT processes N <subscript>2</subscript> ( v <subscript>1</subscript> ) + N <subscript>2</subscript> ( v <subscript>2</subscript> ) → N <subscript>2</subscript> ( v <subscript>1</subscript> - Δ v ) + N <subscript>2</subscript> ( v <subscript>2</subscript> ) (Δ v = ±1, ±2, ±3) for collisions with arbitrary initial vibrational states. This work not only significantly reduces computational resources but also serves as a reference for the study of the state-to-state dynamics of all four-atom collision systems in hypersonic flows.
Details
- Language :
- English
- ISSN :
- 1520-5215
- Volume :
- 128
- Issue :
- 28
- Database :
- MEDLINE
- Journal :
- The journal of physical chemistry. A
- Publication Type :
- Academic Journal
- Accession number :
- 38953499
- Full Text :
- https://doi.org/10.1021/acs.jpca.4c00590