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Photoionization from the Ground and Excited Vibrational States of H$$^+_2$$ and Its Deuterated Isotopologues

Journal Article · · The Astrophysical Journal. Supplement Series
 [1];  [1];  [2];  [1];  [1]
  1. Curtin Univ., Perth, WA (Australia)
  2. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
Photoionization cross sections and rate coefficients have been calculated for all bound vibrational levels of the 1sσg 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.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
US Air Force Office of Scientific Research (AFOSR); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2570751
Report Number(s):
LA-UR--23-28378; 10.3847/1538-4365/acf840; 1538-4365
Journal Information:
The Astrophysical Journal. Supplement Series, Journal Name: The Astrophysical Journal. Supplement Series Journal Issue: 1 Vol. 269; ISSN 1538-4365; ISSN 0067-0049
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (14)

Figure 1(p. 4)figure Figure 1
Table 1(p. 4)table Table 1
Figure 2(p. 5)figure Figure 2
Figure 3(p. 6)figure Figure 3
Figure 4(p. 6)figure Figure 4
Figure 5(p. 7)figure Figure 5
Figure 6(p. 7)figure Figure 6
Figure 7(p. 8)figure Figure 7
Figure 8(p. 8)figure Figure 8
Figure 9(p. 8)figure Figure 9
Figure-10(p. 8)figure Figure-10
Table 2(p. 8)table Table 2
Table 3(p. 10)table Table 3
Figure 11(p. 12)figure Figure 11

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