A quantum-mechanical investigation of O(3P) + CO scattering cross sections at superthermal collision energies
crossref(2023)
摘要
<p>The Martian atmospheric gas loss may have played a role in transforming Mars from a warmer, water-containing planet into a cold and dry one. This loss is attributed to different phenomena, including photodissociation of H<sub>2</sub>O followed by Jeans escape and photochemical escape of hot O atoms.  It was proposed that collisions with hot (super-thermal) neutral atoms can eject light species from the atmosphere such as He [1], D[2], H<sub>2</sub> [3], and OH<sub> </sub>[4]. Here, collisions with super-thermal oxygen atoms are the most important because of its kinetic energy and abundance. Carbon monoxide (CO) has been used as a probe for studying the planet’s atmospheric composition and the dynamics involved [5]. In this study, we computed the elastic and inelastic integral and differential cross-sections for CO collisions with energetic O(<sup>3</sup>P) and its isotopes using a full coupled-channel quantum mechanical formalism at collision energies from 0.4 to 5 eV. The O+CO interactions were described using recently constructed potential energy surfaces of <sup>3</sup>A′, <sup>3</sup>A″, and 2<sup>3</sup>A″ symmetry [6], dissociating to the atomic ground state. The state-to-state, elastic, and inelastic cross-sections were calculated for individual surfaces as well as their statistical average [7]. We applied the new cross sections in a simple 1D column transport model to provide revised escape and energy transfer rates of O(<sup>3</sup>P) and its isotopes in thermal CO gas, at the conditions corresponding to the upper atmosphere of Mars, where CO is abundant.</p> <p>References:</p> <p>[1]       S. Bovino, P. Zhang, F. A. Gianturco, A. Dalgarno, and V. Kharchenko, “Energy transfer in O collisions with He isotopes and Helium escape from Mars,” <em>Geophys. Res. Lett.</em>, vol. 38, no. 2, pp. 2–6, 2011, doi: 10.1029/2010GL045763.</p> <p>[2]       P. Zhang, V. Kharchenko, M. J. Jamieson, and A. Dalgarno, “Energy relaxation in collisions of hydrogen and deuterium with oxygen atoms,” <em>J. Geophys. Res. Sp. Phys.</em>, vol. 114, no. 7, pp. 1–14, 2009, doi: 10.1029/2009JA014055.</p> <p>[3]       M. Gacesa, P. Zhang, and V. Kharchenko, “Non-thermal escape of molecular hydrogen from Mars,” <em>Geophys. Res. Lett.</em>, vol. 39, no. 10, pp. 1–6, 2012, doi: 10.1029/2012GL050904.</p> <p>[4]       M. Gacesa, N. Lewkow, and V. Kharchenko, “Non-thermal production and escape of OH from the upper atmosphere of Mars,” <em>Icarus</em>, vol. 284, pp. 90–96, 2017, doi: 10.1016/j.icarus.2016.10.030.</p> <p>[5]       M. Zhang and D. Shi, “Transition properties of the X 1 Σ + , I 1 Σ − , A 1 Π , D 1 Δ , B 1 Σ + , and a 3 Π states of carbon monoxide,” <em>Comput. Theor. Chem.</em>, vol. 1202, no. May, p. 113302, 2021, doi: 10.1016/j.comptc.2021.113302.</p> <p>[6]       R. L. Ja, G. M. Chaban, and M. Field, “Collisional Dissociation of CO : ab initio Potential Energy Surfaces and Quasiclassical Trajectory Rate Coe cients,” pp. 1–54, 2019.</p> <p>[7]       S. Chhabra, M. Gacesa, M. S. Khalil, A. Al Ghaferi, and N. El-kork, “A quantum-mechanical investigation of O(3P) + CO scattering cross sections at superthermal collision energies,” <em>Mon. Not. R. Astron. Soc.</em>, no. October, 2022, doi: https://doi.org/10.1093/mnras/stac3057.</p> <p> </p>
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要