First detection of the O III 495.8911 and 500.6843 nm lines in the Earth's upper atmosphere

Witasse, Olivier; Slanger, T. G.; Thissen, R.

doi:10.5194/angeo-29-2235-2011

Cited by 3 publications

(2 citation statements)

References 20 publications

(20 reference statements)

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“…ref. 25,[34][35][36]. Even though N 2 + + and O 2 + + are expected to exist in the Earth's atmosphere, they unfortunately cannot be distinguished from N + and O + signatures by mass spectrometry.…”

Section: Positive Detection Of Doubly-charged Ions In Planetary Ionos...mentioning

confidence: 99%

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Doubly-charged ions in the planetary ionospheres: a review

Thissen

Witasse

Dutuit

et al. 2011

Phys. Chem. Chem. Phys.

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This paper presents a review of the current knowledge on the doubly-charged atomic and molecular positive ions in the planetary atmospheres of the Solar System. It is focused on the terrestrial planets which have a dense atmosphere of N(2) or CO(2), i.e. Venus, the Earth and Mars, but also includes Titan, the largest satellite of Saturn, which has a dense atmosphere composed mainly of N(2) and a few percent of methane. Given the composition of these neutral atmospheres, the following species are considered: C(++), N(++), O(++), CH(4)(++), CO(++), N(2)(++), NO(++), O(2)(++), Ar(++) and CO(2)(++). We first discuss the status of their detection in the atmospheres of planets. Then, we provide a comprehensive review of their complex and original photochemistry, production and loss processes. Synthesis tables are provided for those ions, while a discussion on individual species is also provided. Methods for detecting doubly-charged ions in planetary atmospheres are presented, namely with mass-spectrometry, remote sensing and fine plasma density measurements. A section covers some original applications, like the possible effect of the presence of doubly-charged ions on the escape of an atmosphere, which is a key topic of ongoing planetary exploration, related to the evolution of a planet. The results of models, displayed in a comparative way for Venus, Earth, Mars and Titan, are discussed, as they can predict the presence of doubly-charged ions and will certainly trigger new investigations. Finally we give our view concerning next steps, challenges and needs for future studies, hoping that new scientific results will be achieved in the coming years and feed the necessary interdisciplinary exchanges amongst different scientific communities.

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Section: Positive Detection Of Doubly-charged Ions In Planetary Ionos...mentioning

confidence: 99%

“…12,13 The emissions at 495.8911 nm and 500.6843 nm have just recently been identified in VLT UVES spectra acquired in 2003. 36 The emissions near 166-167 nm may be identified in a spectrum acquired with the HUT telescope (see Fig. 12).…”

Section: Spectroscopy and Remote Sensingmentioning

confidence: 99%

Doubly-charged ions in the planetary ionospheres: a review

Thissen

Witasse

Dutuit

et al. 2011

Phys. Chem. Chem. Phys.

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Absolute cross sections for O2 dication production by electron impact

Sigaud

Ferreira

Montenegro

2013

The Journal of Chemical Physics

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Direct detection of homonuclear diatomic dications using mass spectrometry has the intrinsic inability to distinguish between fragments with the same mass-to-charge ratio, as is the case of the oxygen molecule. In this work, absolute cross sections for the double ionization of the homoisotopic (16)O2 molecule by electron impact, in the 30-400 eV energy range, is reported for the first time, and show significant discrepancies with previous results, obtained with the heteroisotopic (16)O(17)O. The measurements suggest that O2 (++) is mainly produced through post-collisional Auger-like deexcitation.

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Absolute cross sections for production of molecular dications by electron impact

Sigaud

Montenegro

2020

J. Phys.: Conf. Ser.

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Molecular dications are important metastable species present in a variety of environments including, but not restricted to, planetary atmospheres and the human body when submitted to radiation. On the other hand, symmetric molecular dications cannot be separated from the cation corresponding to the molecule broken in half (e.g. N 2 + + and N+) in stantard mass spectrometers. The DETOF technique allows one to identify the symmetric molecular dication, obtaining absolute cross sections related to their production. Results for dications of molecular nitrogen, molecular oxygen, ethylene and benzene are discussed here, giving emphasis on the mechanisms behind their production. It is seen that, while most metastable molecular dications result from a combination of direct double ionization and Auger-like processes, N 2 + + and O 2 + + represent so-called pure cases, where the dication is produced only by, respectively, double direct ionization or post-collisional Auger-like decay.

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First detection of the O III 495.8911 and 500.6843 nm lines in the Earth's upper atmosphere

Cited by 3 publications

References 20 publications

Doubly-charged ions in the planetary ionospheres: a review

Doubly-charged ions in the planetary ionospheres: a review

Absolute cross sections for O2 dication production by electron impact

Absolute cross sections for production of molecular dications by electron impact

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