Effective rotational temperatures of N<sub>2</sub><sup>+</sup> (3914 Å) excited by monoenergetic electrons in a crossed beam

Culp, G.; Stair, A. T.

doi:10.1051/jcp/1967640057

Cited by 24 publications

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“…This effect may be visible when the bombarding electrons have energies close to the threshold energy, as in the case of artificial aurora. However, the error in the temperature measurement should be of the order of 50 K at a temperature of 300 K (Culp and Stair, 1967) measured using a spectrometer. This effect is too small to explain the observed results.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Recognizing the blue emission in artificial aurora

Holma

Kaila

Kosch

et al. 2006

Advances in Space Research

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On 12 th November 2001, during an EISCAT UK/GE artificial aurora campaign, the optical group from the University of Oulu performed optical measurements at the EISCAT site in Ramfjordmoen, including the first measurement of blue emissions in artificial aurora at high latitudes. Optical instruments, including a photometer, a real speed TV camera and a digital camera, were monitoring the emissions. The emissions that the photometer was designed to mesure were 557.7 nm (OI), 630.0 nm (OI) and 427.8 nm (N 2 +). The energy thresholds of these emissions are approximately 2 eV, 4 eV and 19 eV, respectively. In the natural aurora the blue emission at around 427.8 nm is always dominated by the N 2 + 1NG (0,1) band. However, there are two weak emission bands lying under this strong emission, namely, the N 2 VK(4,15) (threshold energy 6 eV) and N 2 2P(1,5) (threshold 11 eV). These excitation energies are lower than the energy needed to excite N 2 + 1NG (0,1) level and therefore could have a stronger intensity compared with N 2 + 1NG (0,1) in the spectrum of artificial aurora than in natural aurora. The auroral photometer of the University of Oulu has been designed for investigating natural aurora. The photometer was equipped with two channels measuring different wavelength bands around 427.8 nm. These channels were intended to be used to determine rotational temperature from the ratio of the intensities through the channels. However, here we estimate the intensities of the three overlapping emission bands instead.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Recognizing the blue emission in artificial aurora

Holma

Kaila

Kosch

et al. 2006

Advances in Space Research

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“…On peut penser que cette perturbation n'est pas la même dans les réactions d'ionisation et d'échange de charge, celle-ci étant primordiale dans le cas de Ne+ [25]. 4. Structure rotationnelle de N2 , B 2 1.…”

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Étude de l'excitation rotationnelle de l'état B2 Σ de N2+ par impact d'ions lourds

1975

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2014 Une cible d'azote est ionisée et excitée par impact d'ions H+, Ne+, Li+, Na+ et K+ accélérés de 1 keV à 120 keV. La structure de rotation de l'ion moléculaire N2+, produit au niveau B2 03A3, est analysée par spectrométrie photoélectrique de la bande B2 03A3 ~ X2 03A3 entre 3 914 Å et 3 820 Å. On observe la superposition de deux distributions boltzmanniennes des populations à la température du laboratoire et à une température plus élevée. Cette dernière, qui peut atteindre plus de 5 000 K à basse énergie, dans le cas des ions alcalins, est due aux réactions d'échange de charge. Sa variation en fonction de l'énergie des faisceaux incidents et des défauts d'énergie des réactions est interprétée dans un modèle classique de transfert de moment angulaire par collision. Abstract. 2014 A nitrogen target is ionized and excited by impact of H+, Ne+, Li+, Na+ and K+ ions in the energy range 1-120 keV. The rotational structure of N2+ B2 is analysed by photo

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Electron beam diagnostics of nitrogen. Multiquantum rotational transitions during excitation

Belikov

Zarvin

Karelov

et al. 1984

J Appl Mech Tech Phys

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Effective rotational temperatures of N₂⁺ (3914 Å) excited by monoenergetic electrons in a crossed beam

Cited by 24 publications

References 0 publications

Recognizing the blue emission in artificial aurora

Recognizing the blue emission in artificial aurora

Étude de l'excitation rotationnelle de l'état B2 Σ de N2+ par impact d'ions lourds

Electron beam diagnostics of nitrogen. Multiquantum rotational transitions during excitation

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Effective rotational temperatures of N2+ (3914 Å) excited by monoenergetic electrons in a crossed beam

Cited by 24 publications

References 0 publications

Recognizing the blue emission in artificial aurora

Recognizing the blue emission in artificial aurora

Étude de l'excitation rotationnelle de l'état B2 Σ de N2+ par impact d'ions lourds

Electron beam diagnostics of nitrogen. Multiquantum rotational transitions during excitation

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Effective rotational temperatures of N₂⁺ (3914 Å) excited by monoenergetic electrons in a crossed beam