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arXiv 2510.03327physics.chem-phastro-ph.EP
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CO₂-氢气和CO₂-氦气碰撞性质的全面从头计算

Comprehensive Ab Initio Quantum Computations of CO$_{\rm 2}$-H$_{\rm 2}$ and CO$_{\rm 2}$-He Collisional Properties

Massachusetts Institute of Technology(麻省理工学院);Harvard & Smithsonian(哈佛-史密森尼天体物理中心);Université Paris-Saclay(巴黎萨克雷大学);University of Tunis El Manar(突尼斯曼纳尔大学)

Prajwal Niraula, Laurent Wiesenfeld, Nejmeddine Jaïdane, Julien de Wit, Robert J. Hargreaves, Jeremy Kepner, Deborah Woods, Cooper Loughlin, Iouli E. Gordon

AI总结:

本文通过结合CCSD(T)势能面计算与YUMI框架中的近耦合动力学散射,全面计算了CO₂-氢气和CO₂-氦气的弹性与非弹性碰撞截面、速率系数和压力展宽参数,提供了旋转量子数依赖性的展宽系数拟合,实现了对HITRAN和HITEMP等光谱数据库的整合,并在JWST时代行星大气研究中达到了10%的精度要求。

摘要:

我们展示了CO₂-氢气和CO₂-氦气碰撞性质的全面从头计算。我们的框架结合CCSD(T)势能面计算与YUMI框架中的近耦合动力学散射,以推导弹性及非弹性截面、速率系数和压力展宽参数。我们对CO₂-氢气的展宽系数在j=25范围内,以及CO₂-氦气的展宽系数在j=40范围内进行了旋转依赖性的表征,并在40-800 K温度范围内研究了其温度依赖性。我们还提供了旋转量子数函数的Padé拟合,使能够外推并整合到包括HITRAN和HITEMP在内的光谱数据库中。所得到的压力展宽系数在绝对尺度上再现了现有的实验测量,无需经验修正因子,并满足为JWST时代行星大气研究所确定的约10%的精度要求。这比之前可用的参数在更高温度(T>400 K)时,可能偏离所需精度高达五倍,具有显著的改进。本文提供了所有推导、计算的碰撞性质和数据库准备的产品。这些结果共同确立了CO₂与H₂和He碰撞展宽的全面从头计算、无参数、全量子基础,同时展示了从头计算方法在行星大气、燃烧、健康科学和聚变等离子体诊断等下一代光谱需求中的变革潜力。

英文摘要:

We present comprehensive \textsl{ab initio} fully quantum calculations of CO$_{\rm 2}$--H$_{\rm 2}$ and CO$_{\rm 2}$--He collisional properties. Our framework combines CCSD(T) potential-energy-surface calculations with close-coupling dynamical scattering in the \YUMI~framework to derive elastic and inelastic cross sections, rate coefficients, and pressure broadening parameters. We characterize the rotational dependence of the broadening coefficients up to $j=25$ for CO$_{\rm 2}$--H$_{\rm 2}$ and $j=40$ for CO$_{\rm 2}$--He, and their temperature dependence over 40--800 K. We also provide Padé fits as a function of rotational quantum number, enabling extrapolation and integration into spectroscopic databases including HITRAN and HITEMP. The resulting pressure broadening coefficients reproduce available experimental measurements on an absolute scale, without empirical correction factors, and meet the $\sim$10\% precision requirement identified for \textit{JWST}-era exoplanet atmospheric studies. This represents a substantial improvement over previously available parameters, which at higher temperatures ($T>400$ K) can fall outside the desired precision by up to a factor of five. All derivations, computed collisional properties, and database-ready products are provided with this manuscript. Together, these results establish a comprehensive \textsl{ab initio}, parameter-free, fully quantum foundation for CO$_2$ collisional broadening by H$_2$ and He, while demonstrating the transformative potential of the ab-initio approach for next-generation spectroscopic needs across planetary atmospheres, combustion, health sciences, and fusion-plasma diagnostics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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