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 UFN, 2003, Volume 173, Number 5, Pages 491–510 (Mi ufn2136)

METHODOLOGICAL NOTES

Radiative transitions in the molecular H2+ ion

V. S. Lebedev, L. P. Presnyakov, I. I. Sobel'man

P. N. Lebedev Physical Institute, Russian Academy of Sciences

Abstract: A theoretical analysis was made of continuous light absorption in the visible, IR, and UV spectral ranges in a quasi-equilibrium hydrogen plasma with an effective temperature between 1500 and 25000 K. The light absorption is caused by the photodissociation of molecular H2+ ions from a large group of excited vibrational – rotational levels of the ground electronic term and by free – free radiative transitions at the collisions of protons (H+ ) with hydrogen atoms H(1s). The phototransitions under consideration take place with a change of the electronic state 2Σ+g2Σ+u of the molecular (quasi-molecular) H2+ ion. Quantum and quasi-classical descriptions of partial photodissociation cross sections and effective photoabsorption cross sections at particle collisions were accomplished on the basis of the theory of nonadiabatic transitions between the potential energy curves of a diatomic molecule. An analytical approach is set forth to calculate the integral contribution from all possible vibrational – rotational levels to the photodissociation cross section averaged over the Boltzmann distribution function. A detailed study was made of the contribution of bound – free and free – free transitions to the total optical absorption coefficient by the H2+ system as a function of temperature and wavelength. The recently calculated values of effective phototransition cross sections and photoabsorption coefficients are presented and compared with previously available data. Emphasis is placed on considering the relative contribution of positive molecular H2+ ions and negative atomic H ions to the total photoabsorption coefficient of quasi-equilibrium hydrogen plasmas.

DOI: https://doi.org/10.3367/UFNr.0173.200305b.0491

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English version:
Physics–Uspekhi, 2003, 46:5, 473–491

Bibliographic databases:

PACS: 31.15.-p, 31.50.Gh, 33.80.-b

Citation: V. S. Lebedev, L. P. Presnyakov, I. I. Sobel'man, “Radiative transitions in the molecular H2+ ion”, UFN, 173:5 (2003), 491–510; Phys. Usp., 46:5 (2003), 473–491

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Citing articles on Google Scholar: Russian citations, English citations
Related articles on Google Scholar: Russian articles, English articles

This publication is cited in the following articles:
1. Presnyakov L.P., Lebedev V.S., “Photodissociation and free-free absorption of molecular ions”, Atomic and Molecular Data and Their Applications, AIP Conference Proceedings, 771, 2005, 189–198
2. Marigo P., Aringer B., “Low-temperature gas opacity AESOPUS: a versatile and quick computational tool”, Astronomy & Astrophysics, 508:3 (2009), 1539–1569
3. Coppola C.M., Longo S., Capitelli M., Palla F., Galli D., “Vibrational Level Population of $H_2$ and $H_2^+$ in the Early Universe”, Astrophysical Journal Supplement Series, 193:1 (2011)
4. Coppola C.M., Galli D., Palla F., Longo S., Chluba J., “Non-Thermal Photons and H-2 Formation in the Early Universe”, Mon. Not. Roy. Astron. Soc., 434:1 (2013), 114–122
5. Marinkovic B.P., Jevremovic D., Sreckovic V.A., Vujcic V., Ignjatovic L.M., Dimitrijevic M.S., Mason N.J., “Beamdb and Mold - Databases For Atomic and Molecular Collisional and Radiative Processes: Belgrade Nodes of Vamdc”, Eur. Phys. J. D, 71:6 (2017), 158
6. Zammit M.C., Savage J.S., Colgan J., Fursa D.V., Bray I., Leiding J., Nisoli C., Fontes Ch.J., Kilcrease D.P., Hakel P., Timmermans E., “The Los Alamos National Laboratory Molecular Opacity Project and the Photodissociation Isotopic Effects of H(2)(+)and D-2(+)”, Workshop on Astrophysical Opacities, Astronomical Society of the Pacific Conference Series, 515, eds. Mendoza C., TurckChieze S., Colgan J., Astronomical Soc Pacific, 2018, 145–154
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