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Caracciolo A, Zhang J, Lahankar SA, Minton TK. Dynamics of Inelastic and Reactive Collisions of 16O( 3P) with 15N 18O. J Phys Chem A 2022; 126:2091-2102. [PMID: 35324196 DOI: 10.1021/acs.jpca.1c09778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dynamics of O(3P) + NO collisions were investigated at a collision energy of ⟨Ecoll⟩ = 84.0 kcal mol-1 with the use of a crossed molecular beams apparatus employing a rotatable mass spectrometer detector. This experiment was performed with beams of 16O atoms and isotopically labeled 15N18O molecules to enable the products of reactive and inelastic scattering to be distinguished. Three scattering pathways were observed: inelastic scattering (16O + 15N18O), O-atom exchange (18O + 15N16O), and O-atom abstraction (18O16O + 15N). All product channels exhibited a preponderance of forward scattering, but scattering over a broad angular range was also observed for all products. For inelastic scattering, an average of 90% of the collision energy is retained in the translation of 16O and 15N18O. On the other hand, for O-atom exchange (which also leads to O + NO products), the collision energy is partitioned roughly evenly between the translation of 18O + 15N16O and the internal excitation of 15N16O. The available energy for O-atom abstraction is significantly lower than the collision energy because of the endoergicity of this reaction, but the available energy is again roughly evenly partitioned between the translation of 18O16O + 15N and the internal excitation of the molecular (O2) product. The relative yields of the three scattering pathways were determined to be 0.751 for inelastic scattering, 0.220 for O-atom exchange, and 0.029 for O-atom abstraction.
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Affiliation(s)
- Adriana Caracciolo
- Ann and H. J. Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, Colorado 80303, United States
| | - Jianming Zhang
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Sridhar A Lahankar
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Timothy K Minton
- Ann and H. J. Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, Colorado 80303, United States
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Stokes PW, White RD, Campbell L, Brunger MJ. Toward a complete and comprehensive cross section database for electron scattering from NO using machine learning. J Chem Phys 2021; 155:084305. [PMID: 34470353 DOI: 10.1063/5.0064376] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We review experimental and theoretical cross sections for electron scattering in nitric oxide (NO) and form a comprehensive set of plausible cross sections. To assess the accuracy and self-consistency of our set, we also review electron swarm transport coefficients in pure NO and admixtures of NO in Ar, for which we perform a multi-term Boltzmann equation analysis. We address observed discrepancies with these experimental measurements by training an artificial neural network to solve the inverse problem of unfolding the underlying electron-NO cross sections while using our initial cross section set as a base for this refinement. In this way, we refine a suitable quasielastic momentum transfer cross section, a dissociative electron attachment cross section, and a neutral dissociation cross section. We confirm that the resulting refined cross section set has an improved agreement with the experimental swarm data over that achieved with our initial set. We also use our refined database to calculate electron transport coefficients in NO, across a large range of density-reduced electric fields from 0.003 to 10 000 Td.
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Affiliation(s)
- P W Stokes
- College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia
| | - R D White
- College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia
| | - L Campbell
- College of Science and Engineering, Flinders University, Bedford Park, SA 5042, Australia
| | - M J Brunger
- College of Science and Engineering, Flinders University, Bedford Park, SA 5042, Australia
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Qu Q, Cooper B, Yurchenko SN, Tennyson J. A spectroscopic model for the low-lying electronic states of NO. J Chem Phys 2021; 154:074112. [PMID: 33607908 DOI: 10.1063/5.0038527] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The rovibronic structure of A2Σ+, B2Π, and C2Π states of nitric oxide (NO) is studied with the aim of producing comprehensive line lists for its near ultraviolet spectrum. Empirical energy levels for the three electronic states are determined using a combination of the empirical measured active rotation-vibration energy level (MARVEL) procedure and ab initio calculations, and the available experimental data are critically evaluated. Ab initio methods that deal simultaneously with the Rydberg-like A2Σ+ and C2Π and the valence B2Π state are tested. Methods of modeling the sharp avoided crossing between the B2Π and C2Π states are tested. A rovibronic Hamiltonian matrix is constructed using the variational nuclear motion program Duo whose eigenvalues are fitted to the MARVEL. The matrix also includes coupling terms obtained from the refinement of the ab initio potential energy and spin-orbit coupling curves. Calculated and observed energy levels agree well with each other, validating the applicability of our method and providing a useful model for this open shell system.
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Affiliation(s)
- Qianwei Qu
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Bridgette Cooper
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Sergei N Yurchenko
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
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Xu X, Xu LQ, Xiong T, Chen T, Liu YW, Zhu LF. Oscillator strengths and integral cross sections for the valence-shell excitations of nitric oxide studied by fast electron impact. J Chem Phys 2018; 148:044311. [PMID: 29390809 DOI: 10.1063/1.5019284] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The generalized oscillator strengths for the valence-shell excitations of A2Σ+, C2Π, and D2Σ+ electronic-states of nitric oxide have been determined at an incident electron energy of 1500 eV with an energy resolution of 70 meV. The optical oscillator strengths for these transitions have been obtained by extrapolating the generalized oscillator strengths to the limit that the squared momentum transfer approaches to zero, which give an independent cross-check to the previous experimental and theoretical results. The integral cross sections for the valence-shell excitations of nitric oxide have been determined systematically from the threshold to 2500 eV with the aid of the newly developed BE-scaling method for the first time. The present optical oscillator strengths and integral cross sections of the valence-shell excitations of nitric oxide play an important role in understanding many physics and chemistry of the Earth's upper atmosphere such as the radiative cooling, ozone destruction, day glow, aurora, and so on.
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Affiliation(s)
- Xin Xu
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Long-Quan Xu
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Tao Xiong
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Tao Chen
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Ya-Wei Liu
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Lin-Fan Zhu
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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Campbell L, Allan M, Brunger MJ. Electron impact vibrational excitation of carbon monoxide in the upper atmospheres of Mars and Venus. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011ja016848] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- L. Campbell
- ARC Centre for Antimatter-Matter Studies, School of Chemical and Physical Sciences; Flinders University; Adelaide, South Australia Australia
| | - M. Allan
- Department of Chemistry; University of Fribourg; Fribourg Switzerland
| | - M. J. Brunger
- ARC Centre for Antimatter-Matter Studies, School of Chemical and Physical Sciences; Flinders University; Adelaide, South Australia Australia
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Kato H, Kawahara H, Hoshino M, Tanaka H, Brunger M. Excitation of the A2Σ+, C2Π and D2Σ+ Rydberg-electronic states in NO by 100eV electrons. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.06.134] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Campbell L, Cartwright DC, Brunger MJ, Teubner PJO. Role of electronic excited N2in vibrational excitation of the N2ground state at high latitudes. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005ja011292] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Jelisavcic M, Panajotovic R, Buckman SJ. Absolute collision cross sections for low energy electron scattering from NO: the role of resonances in elastic scattering and vibrational excitation. PHYSICAL REVIEW LETTERS 2003; 90:203201. [PMID: 12785890 DOI: 10.1103/physrevlett.90.203201] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2003] [Indexed: 05/24/2023]
Abstract
Absolute measurements of elastic scattering and vibrational excitation of the NO molecule by low energy electron impact (0.4-2.5 eV) are presented. They show that previous estimates of these cross sections may be in error by as much as a factor of 3 and provide compelling evidence for a reassessment of the balance between elastic scattering and vibrational excitation at incident energies below 2 eV. They also confirm the critical contribution that intermediate negative ion resonances (NO-) make to the various scattering processes for this molecule at low incident energies.
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Affiliation(s)
- M Jelisavcic
- Atomic and Molecular Physics Laboratories, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT, Australia 0200
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A study of electron impact excitation of the A2Σ+ state of nitric oxide in the near-threshold energy range. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00426-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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