The Astrophysical Journal · 1982 · 148 citations · 0 references
The molecular ion HeH⁺ is a key species in astrophysical plasmas, and its formation and destruction mechanisms are of interest. The authors calculated the steady‑state abundance of HeH⁺ in planetary nebulae and dense clouds exposed to X‑ray and XUV ionization, and estimated emission‑line intensities at 149.13, 3.364, and 3.607 µm. They predict that 149.13‑µm emission from H II blisters and 3.364‑µm emission from dense planetary nebulae could be detectable. Published in *The Astrophysical Journal* (April 1982, DOI 10.1086/159849).
view Abstract Citations (140) References (66) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The formation and destruction of HeH/+/ in astrophysical plasmas Roberge, W. ; Dalgarno, A. Abstract A discussion is presented of the formation and destruction mechanisms of the molecular ion HeH(+) in astrophysical plasmas. Calculations are made of the steady state abundance of HeH(+) in planetary nebulae and in dense clouds subjected to X-ray and XUV ionization. The excitation processes are investigated, and estimates are made of the emission-line intensities at 149.13, 3.364, and 3.607 microns. Emission at 149.13 microns from H II blisters and at 3.364 microns from high density planetary nebulae may be detectable. Publication: The Astrophysical Journal Pub Date: April 1982 DOI: 10.1086/159849 Bibcode: 1982ApJ...255..489R Keywords: Cosmic Plasma; Helium Ions; Hydrogen Ions; Molecular Clouds; Planetary Nebulae; Abundance; Association Reactions; Dense Plasmas; Emission Spectra; Extreme Ultraviolet Radiation; Hydrogen Clouds; Ionization; Molecular Excitation; Molecular Interactions; Molecular Ions; Photodissociation; Recombination Reactions; X Rays; Astrophysics full text sources ADS |