Photoionization from the Ground and Excited Vibrational States of H2+ and Its Deuterated Isotopologues

IF 8.6 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Supplement Series Pub Date : 2023-11-01 DOI:10.3847/1538-4365/acf840

Adam Singor, Liam H. Scarlett, Mark C. Zammit, Igor Bray, Dmitry V. Fursa

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Abstract

Abstract Photoionization cross sections and rate coefficients have been calculated for all bound vibrational levels of the 1s σ g state of H 2 + , HD + , and D 2 + . The Born–Oppenheimer approximation is employed in our calculation of vibrationally resolved photoionization cross sections. Vibrationally resolved and local thermal equilibrium photoionization rate coefficients are presented for photon temperatures less than 50,000 K and are found to be several orders of magnitude larger than previous results in the literature. Analytic fits for the vibrationally resolved and local thermal equilibrium photoionization rate coefficients are provided. Near-threshold oscillations in the vibrationally resolved photoionization are observed. A benchmark set of photoionization cross sections are presented. Fixed-nuclei photoionization cross sections are calculated using two-center true continuum wave functions and are verified by comparison with previous calculations and are found to be in excellent agreement in all cases. Data files for our set of benchmark cross sections, rate coefficients, and fitting parameters for H 2 + , HD + , and D 2 + are available on Zenodo under an open-source Creative Commons Attribution license at doi: 10.5281/zenodo.8304061 .

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H2+及其氘化同位素的基态和激发态光离

摘要计算了h2 +、HD +和d2 +在1s σ g态的所有束缚振动能级的光离截面和速率系数。本研究采用玻恩-奥本海默近似计算振动分辨光电离截面。在光子温度低于50,000 K时，给出了振动分辨和局部热平衡光电离速率系数，并且发现比文献中先前的结果大几个数量级。给出了振动分解和光离率系数和局部热平衡光离率系数的解析拟合。在振动分辨光电离中观察到近阈值振荡。给出了一组光电离截面的基准。用双中心真连续波函数计算了固定核光电离截面，并与以前的计算进行了比较验证，发现在所有情况下都非常一致。我们的基准横截面、速率系数和h2 +、HD +和2d +的拟合参数的数据文件可以在开源的知识共享署名许可下在Zenodo上获得，doi: 10.5281/ Zenodo。8304061。

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来源期刊

Astrophysical Journal Supplement Series 地学天文-天文与天体物理

CiteScore

14.50

自引率

5.70%

发文量

264

审稿时长

2 months

期刊介绍： The Astrophysical Journal Supplement (ApJS) serves as an open-access journal that publishes significant articles featuring extensive data or calculations in the field of astrophysics. It also facilitates Special Issues, presenting thematically related papers simultaneously in a single volume.